Practical Guide to Hazard Class 3 Flammable Liquids
Interlink編集部What Is Hazard Class 3
Hazard Class 3 refers to "flammable liquids" in the international hazardous materials classification system. This category may include frequently handled cargo in international logistics such as alcohols, solvents, paints, adhesives, inks, fragrances, fuels, and cleaning agents.
With Class 3, it is important to note that hazard determination cannot be made based solely on the product name. Names like "paint," "cleaning agent," "fragrance," or "alcohol product" do not clarify whether the item is hazardous or non-hazardous. Confirmation requires checking the SDS, flash point, initial boiling point, UN number, proper shipping name, packaging group, and regulations applicable to each transport mode.
In particular, Class 3 cargo may or may not be hazardous depending on factors such as concentration, formulation, solvent content, and whether it is water-based or oil-based, even if the product name is the same. Therefore, re-verifying with the most current SDS is essential, even if you have previously handled the same product.
In freight forwarding practice, Class 3 cargo directly affects acceptance eligibility by shipping lines, airlines, CFS, hazardous materials warehouses, inland delivery companies, and consignees. It is fundamental to distinguish between Class 3 applicability for transport purposes and classification under the Fire Services Act as Category 4 hazardous materials separately.
Scope Covered in This Article
| Item | Contents Covered in This Article | Contents Covered in Other Articles |
|---|---|---|
| Basics of Class 3 | Organizes Class 3 dangerous goods as the classification for flammable liquids in international transport. | The overall picture of Classes 1 through 9 is covered in the Hazardous Materials Classification article. |
| Initial Confirmation Items | Covers the process of verifying SDS, UN number, proper shipping name, hazard class, packaging group, flash point, and initial boiling point. | How to read the SDS comprehensively is covered in the SDS article. |
| Packaging Group | Explains the verification approach for determining whether packaging group I, II, or III applies by checking flash point and initial boiling point. | The entire packaging group system and its relation to other classes are covered in the Packaging Group article. |
| Item-Specific Points | Addresses key checks for common cargoes such as ethanol, methanol, acetone, paints, adhesives, fragrances, and cleaning agents. | Final classification of individual products should be confirmed using the latest SDS, manufacturer information, and hazardous materials evaluation documents. |
| Relationship with Fire Services Act Class 4 Dangerous Goods | Deals with distinguishing Class 3 under international transport from Fire Services Act Class 4 dangerous goods related to domestic storage and handling. | Detailed classification, specified quantities, and dangerous goods facilities under the Fire Services Act are covered in the Fire Services Act Dangerous Goods article. |
| Differences in Marine and Air Transport | Covers how acceptance conditions, quantity limits, packaging, and labeling differ for the same Class 3 cargo between marine and air transport. | Details on marine transport are in the IMDG Code article, and air transport details are in the IATA Dangerous Goods Regulations article. |
| CFS, Warehousing, and Inland Delivery | Addresses common issues where Class 3 cargo is held up during CFS in-gate, storage in dangerous goods warehouses, inland delivery, or consignee storage. | Details on CFS dangerous goods in-gate, dangerous goods warehousing, and inland delivery conditions are covered in their respective articles. |
| Practical Troubleshooting | Covers problems arising from water-based labeling, low-concentration alcohols, historical precedents, SDS discrepancies, and air transport switching. | Liability judgments after incidents, insurance, and damage compensation are covered in the Cargo Incidents and Liability Scope article. |
Key Items to Verify First for Class 3
For Class 3 cargo, start by checking the transport information section of the Safety Data Sheet (SDS). In practice, it is important to verify the transport classification details rather than the product name or its intended use.
| Verification Item | What to Confirm | Practical Significance | Risks of Inadequate Verification |
|---|---|---|---|
| UN Number | Confirm the four-digit number identifying the hazardous material. | Serves as the entry point for the official shipping name, class, packaging requirements, and declaration details. | Shipping lines, airlines, and CFS may be unable to accept the cargo. |
| Official Shipping Name | Verify the official transport name used for shipping. | This is the name used in the hazardous materials declaration, not the invoice product name. | Declarations and booking information may be incorrect. |
| Applicability to Class 3 Flammable Liquids | Check if the cargo qualifies as a flammable liquid under Class 3. | Affects labeling, packaging, acceptance eligibility, and storage conditions. | Cargo may be mistakenly handled as non-hazardous. |
| Packaging Group | Determine whether the cargo falls under Packaging Group I, II, or III. | Relates to hazard severity, packaging, quantity limits, and acceptance conditions. | Packaging standards and quantity limits may be applied incorrectly. |
| Flash Point | Confirm the temperature at which the liquid ignites. | Forms the basis for determining Class 3 applicability and packaging group. | Aqueous or low-concentration products may be mistakenly treated as general cargo. |
| Initial Boiling Point or Boiling Point | Verify information related to volatility and packaging group classification. | Especially relevant for determining Packaging Groups I, II, and III. | Packaging group and conditions may be misclassified. |
| Subsidiary Hazards | Check for additional hazards such as toxicity, corrosivity, or environmental harm. | Impacts additional labeling, segregation, storage, and compatibility for consolidation. | Relying only on the primary class may overlook necessary isolation and markings. |
| Marine Pollutant Status | Confirm if the cargo must be declared and marked as a marine pollutant for sea transport. | Relevant to hazardous materials declaration, markings, and shipping line approval. | Declaration and marking deficiencies may occur during sea transport. |
| Limited Quantity and Excepted Quantity | Determine if Limited Quantity or Excepted Quantity provisions apply. | Affects eligibility for simplified handling and changes labeling and quantity requirements. | Misunderstanding that small quantities do not require declaration is possible. |
| Hazardous Material Status under the Fire Services Act | Check whether the cargo qualifies as Class 4 hazardous material under Japanese domestic law. | Influences warehouse storage, in-gate confirmation, inland delivery, and consignee storage. | Even if arranged for international transport, domestic storage may be prohibited. |
Freight forwarders proceed with transport arrangements based on the SDS contents but are not in a position to independently classify the cargo. If there are unclear points or if the transport information section is blank, confirmation with the shipper, manufacturer, or specialist is essential, and documenting responses in writing when necessary is recommended.
Relationship with Container Grades
For Class 3 flammable liquids, container grades are assigned according to the degree of hazard. In practice, the closed cup flash point and initial boiling point are mainly checked to determine whether the cargo falls under Container Grade I, II, or III.
| Container Grade | Hazard Level Approximation | Typical Confirmation Criteria for Class 3 | Practical Notes |
|---|---|---|---|
| I | High hazard | Generally, initial boiling point is 35°C or below. | Packing, quantity, and acceptance conditions tend to be stricter; especially requires thorough confirmation for air transport. |
| II | Moderate hazard | Initial boiling point exceeds 35°C, and flash point is below 23°C. | Common with paints, solvents, and alcohols; pre-approval from carriers and airlines is usually necessary. |
| III | Relatively lower hazard | Initial boiling point exceeds 35°C, and flash point is between 23°C and 60°C. | Even with relatively lower hazard, this is not ordinary cargo; packaging, labeling, declaration, and acceptance conditions must be confirmed. |
The above provides a basic summary for practical use. Final determinations should be made by referring to the latest SDS, IMDG Code, IATA Dangerous Goods Regulations, relevant national laws, and the acceptance criteria of shipping lines and airlines.
For viscous liquids such as paints, adhesives, and resin solutions, factors including viscosity, solvent separation, container capacity, and special provisions may make classification impossible based on these general criteria alone and require additional considerations.
Classification Changes Due to Water-Based or Oil-Based Formulation, Concentration, and Composition Changes
A common practical issue with Class 3 hazardous materials is classification differences caused by being water-based or oil-based, concentration levels, and formulation changes.
For example, paints and adhesives containing high solvent content and oil-based ingredients tend to fall under Class 3, whereas water-based paints or water-based adhesives may sometimes be exempt from hazardous material transport regulations. However, even if labeled "water-based," the product may contain alcohol-based solvents or organic solvents. Therefore, the term "water-based" alone should not be used to determine if the item is non-hazardous.
The same applies to alcohol-containing products. Ethanol, isopropanol, fragrances, cosmetic ingredients, and cleaning agents have flash points that vary depending on concentration and formulation. High-concentration products are more likely to be classified as Class 3 hazardous materials, while low-concentration products may not be regulated as hazardous for transport.
Furthermore, even if the product name is unchanged, when manufacturers alter formulations, revise the SDS, or when the country of manufacture or supplier changes, the UN number, packaging category, and transport conditions may also change. Just because a product was previously transported as general cargo does not guarantee it can be treated the same way now.
Relationship with Hazardous Materials under the Fire Services Act
For Class 3 cargo, it is also important to determine whether it qualifies as hazardous material under the Fire Services Act when stored, in-gated, or delivered within Japan.
The Class 3 classification for international transport is a “hazardous material classification for transport,” whereas hazardous materials under the Fire Services Act are regulations concerning “domestic storage and handling.”
Flammable liquids in particular often overlap with Class 4 hazardous materials under the Fire Services Act. Class 4 includes special flammables, petroleum products (Class 1 to Class 4), alcohols, and animal/vegetable oils.
| Item to Verify | Main Points to Check | Practical Notes | Actions if Issues Arise |
|---|---|---|---|
| Class 3 for International Transport | Check UN number, proper shipping name, packaging group, hazardous materials declaration, labels, and packaging. | Confirm acceptance conditions with shipping lines, airlines, CFS, and hazardous materials warehouses. | If rejected, consider alternative shipments, different carriers, consolidating into FCL, or delaying shipment. |
| Class 4 Hazardous Materials under the Fire Services Act | Verify product classification, designated quantity thresholds, storage and handling locations, and storage conditions. | Acceptance restrictions may apply at domestic warehouses, in-gate locations, and delivery companies. | Confirm storage conditions at hazardous material warehouses, delivery destinations, and storage facilities. |
| Domestic Regulations of Importing Country | Check local regulations on hazardous materials storage, customs clearance, sale, and composition restrictions. | Even if export from Japan is possible, additional confirmation may be needed at the import country side. | Verify acceptance, storage, and delivery conditions through local agents or consignees. |
Cargo that can be shipped as Class 3 under transport regulations may still be refused by domestic warehouses due to Fire Services Act storage restrictions. Conversely, only confirming Fire Services Act compliance while omitting the international hazardous materials declaration is not acceptable. It is critical to verify both aspects separately.
Differences Between Maritime and Air Transport
The handling conditions for Class 3 cargo may vary significantly between maritime and air transport. Especially in air transport, quantity limits, packaging standards, passenger aircraft carriage eligibility, cargo aircraft restrictions, and airline-specific acceptance criteria tend to be more stringent.
| Transport Mode | Main Items to Verify | Practical Considerations | Actions if Issues Arise |
|---|---|---|---|
| Maritime Transport | Check the IMDG Code, dangerous goods declaration, container packing group, stowage, segregation requirements, marine pollutants, and container loading certification. | In LCL shipments, acceptance restrictions by CFS and shipping lines are common. Even in FCL shipments, improper labeling, placards, or packing conditions may result in cargo refusal at in-gate. | Confirm acceptance in advance with shipping lines, CFS, and consolidators; consider converting to FCL or alternative sailings if needed. |
| Air Transport | Verify IATA Dangerous Goods Regulations, packaging standards, quantity limits, eligibility for passenger or cargo aircraft, and airline-specific differences. | Cargo accepted by sea may be rejected or limited to cargo aircraft only in air shipments. Even small quantities require advance confirmation. | Confirm with airlines, air freight forwarders, and couriers; if acceptance is denied, consider maritime transport or alternative airlines. |
| Domestic Storage and Delivery | Check the Fire Services Act, warehouse acceptance conditions, delivery companies' hazardous materials handling capabilities, and consignee storage requirements. | Separate from international transport approvals, domestic hazardous materials warehouses or vehicles capable of handling such cargo may be required. | Confirm available hazardous materials warehouses, compatible delivery companies, and consignee acceptance conditions. |
In freight forwarders’ operations, assumptions such as "If maritime transport was possible before, air transport should be possible" or "Small quantities can be handled as general cargo by air" are risky. It is essential to separately verify hazardous materials regulations and acceptance conditions for each transport mode.
Typical Cargo Examples and Key Points for Confirmation
For Class 3, verification involves not only the cargo name but also the UN number, proper shipping name, packaging group, concentration, formulation, and mode of transport as a set. Below are common examples frequently checked in practice.
| Cargo Example | Typical UN Number and Proper Shipping Name | Tendency of Packaging Group | Confirmation Notes |
|---|---|---|---|
| Ethanol | UN1170 ETHANOL or ETHANOL SOLUTION | Packaging Group II or III depending on concentration. | Check concentration, flash point, intended use, and container capacity. SDS may differ for disinfectant, industrial, or raw material use. |
| Methanol | UN1230 METHANOL | Often Packaging Group II. | Be aware not only of flammability but also toxicity as a subsidiary hazard. Confirm import country regulations. |
| Acetone | UN1090 ACETONE | Often Packaging Group II. | High volatility requires attention to leakage risk, ventilation, fire safety, and quantity restrictions for air transport. |
| Paint | UN1263 PAINT or PAINT RELATED MATERIAL | Packaging Group II or III is possible. | Confirm water- or oil-based type, solvent content, viscosity, and flash point. Even water-based paints require checking SDS transport information. |
| Adhesives | UN1133 ADHESIVES | Packaging Group II or III is possible. | Verify solvent components, whether sold with hardener as a set, and applicability of small quantity exemptions. For two-component types, confirm each component separately. |
| Fragrances and Perfumes | UN1266 PERFUMERY PRODUCTS, etc. | Packaging Group II or III is possible. | Check alcohol concentration, product form, container capacity, and air transport restrictions. Items treated as cosmetics may still be regulated as hazardous materials. |
| Cleaning Agents | UN1993 FLAMMABLE LIQUID, N.O.S., etc. | Packaging Group II or III depending on composition. | Confirm formulation including organic solvents, alcohol, and surfactants. Household product names may correspond to industrial concentrations. |
The above UN numbers and packaging groups are typical examples seen in practice. Final confirmation should always be based on the individual product’s SDS, dangerous goods list, special provisions, and manufacturer’s verification documents.
Key Documents
For Class 3 cargo, in addition to standard export/import documents, documents indicating hazardous materials information are required. In particular, the SDS and hazardous materials declaration are important reference materials used for verification among shipping lines, airlines, warehouses, and freight forwarders.
| Document / Material | Contents to Verify | Practical Significance | Actions If Deficient |
|---|---|---|---|
| SDS | Verify the UN number, proper shipping name, class, packaging group, flash point, initial boiling point, and storage conditions. | Serves as initial reference for determining Class 3 applicability. | Obtain the latest SDS, ensure the SDS matches the relevant product, and acquire manufacturer confirmation as needed. |
| Hazardous Materials Declaration | Confirm the UN number, proper shipping name, packaging group, quantity, packaging type, and emergency contact information. | Primary document for declaring hazardous material information to the carrier. | Cross-check against SDS, invoice, and packing list; if discrepancies occur, request corrections. |
| Invoice | Verify product name, model number, purpose, and quantity. | Check for consistency with the product listed in SDS and hazardous materials declaration. | If the cargo details are unclear, request product identification from the shipper. |
| Packing List | Confirm number of packages, weight, volume, containers, and packing method. | Verify quantities and packaging against the hazardous materials declaration. | If quantities or packaging do not match, arrange corrections before in-gate. |
| Container Certification / Test Report | Confirm approved container, packaging type, test results, and manufacturer’s verification. | Used to verify packaging requirements and acceptance eligibility. | Request acquisition from shipper, manufacturer, or packer as necessary. |
| Documents Confirming Limited Quantity, etc. | Check application conditions for limited quantity, excepted quantity, or minimal quantity hazardous materials. | Used to verify label, quantity, packaging, and documentation requirements. | If conditions are not met, handle the cargo as regular hazardous materials. |
| Fire Services Act Related Documents | Confirm whether the cargo meets Class 4 hazardous materials under the Fire Services Act, designated quantity limits, and storage conditions. | Used to verify domestic storage, in-gate, and delivery conditions. | Confirm requirements for hazardous materials warehouses, dangerous goods warehouses, and delivery locations. |
Discrepancies in UN number, proper shipping name, packaging group, quantity, packaging type, cargo form, or label markings among documents can lead to refusal of acceptance or shipping delays.
Comparison Table of Freight Forwarder Involvement Scope
| Category | What Can Be Supported | What Should Not Be Concluded | Practical Measures |
|---|---|---|---|
| Initial Confirmation of Class 3 Applicability | Verify SDS, flash point, initial boiling point, UN number, and container classification. | Determine hazardous or general cargo status based on product name alone. | Obtain the latest SDS from the shipper or manufacturer. |
| Verification of Classification Information | Check consistency among SDS, hazardous material declaration, invoice, and packing list. | Make final chemical classification decisions independently as a freight forwarder. | Confirm discrepancies with the shipper, manufacturer, or hazardous materials specialists. |
| Confirmation of Aqueous or Oily Nature | Verify indications of aqueous type, solvent content, flash point, and transport details. | Decide non-hazardous status solely based on an aqueous label. | Check Section 14 of the SDS and the flash point. |
| Confirmation for Maritime Transport | Verify IMDG Code, shipping line, CFS, and consolidation contractor acceptance conditions. | Assume current shipment conditions are the same as previous shipments because of past acceptance. | Reconfirm the latest SDS and conditions of shipping line and CFS. |
| Confirmation for Air Transport | Check IATA Dangerous Goods Regulations, airline conditions, quantity limits, and packaging. | Assume acceptance in air transport because of acceptance in maritime transport. | Perform advance confirmation with the airline and air freight agent. |
| Confirmation of Fire Services Act Class 4 | Verify domestic storage, hazardous material warehouse, designated quantities, and consignee acceptance conditions. | Assume domestic storage is acceptable because arrangement under Class 3 transport is possible. | Confirm hazardous material warehouse, domestic delivery company, and consignee conditions. |
| Confirmation of Limited Quantity and Similar Provisions | Check if quantities, packaging, labeling, and carrier acceptance conditions comply. | Assume no need for hazardous material declaration or label confirmation because the quantity is small. | Verify regulatory applicability and carrier acceptance conditions. |
| Document and Cargo Verification | Confirm that SDS, DGD, packing list, exterior labels, and UN number markings are consistent. | Assume cargo label confirmation is unnecessary because documents exist. | Check labels, marks, and container condition before in-gate. |
Common Practical Issues
| Case | Issue | Documents / Parties to Check | Recommended Approach |
|---|---|---|---|
| Requested as general cargo under the assumption it is water-based paint | The non-applicability to Class 3 is judged solely based on the water-based label. | SDS, flash point, solvent content, manufacturer confirmation | Check Section 14 of the SDS and reconfirm whether it falls under Class 3. |
| Arranged as general cargo this time based on past shipments of the same product | No verification of SDS updates, formulation changes, manufacturer changes, or country of manufacture. | Latest SDS, product specification sheets, manufacturer response | Do not rely on past records; confirm based on documentation for the current shipment. |
| Judged not dangerous because of low alcohol concentration | Decision made based only on concentration without checking flash point, quantity, packaging, or transport mode. | SDS, flash point, concentration, container size, airline conditions | Confirm hazardous materials classification for transport and specific air/sea carriage conditions. |
| Combined two-component adhesive as one product for classification | Overlooked possibility that base and hardener may have different classifications. | SDS for each component, DGD, product specifications | Verify base and hardener separately and declare individually if necessary. |
| Attempted to switch from sea to air transport | Confused quantity limits, packaging, and acceptance requirements between sea and air transport. | SDS, IATA Dangerous Goods Regulations, airline feedback, quantity and packaging details | Reconfirm with the airline; if refused, consider continuing sea transport or using a separate shipment. |
| Advanced international transport based only on Fire Services Act confirmation | Confused Class 4 under Fire Services Act with Class 3 under international transport regulations. | SDS Section 14, UN number, DGD, Fire Services Act applicability documents | Separate confirmation of hazardous materials applicability for transport and domestic storage. |
| Attempted to ship as Limited Quantity but failed to meet conditions | Insufficient confirmation of quantity, packaging, markings, and carrier acceptance conditions. | SDS, detailed quantity breakdown, packaging documents, shipping line and airline responses | If conditions are not met, arrange shipment as regular hazardous materials cargo. |
| Discrepancy between outer packaging label and hazardous materials declaration | Lack of consistency checks among actual markings, DGD, SDS, and packing list. | Photos of packaging, DGD, SDS, invoice, packing list | Correct labels and documentation before in-gate and resubmit to all parties involved. |
4-Column Verification Checklist
| Verification Occasion | Party to Confirm With | Items to Verify | Actions if Issues Are Found |
|---|---|---|---|
| When receiving an order for paints, adhesives, cleaning agents, fragrances, etc. | Shipper / Manufacturer | Check the SDS, flash point, initial boiling point, UN number, proper shipping name, and packaging group. | Do not rely on product name alone; request the latest SDS submission. |
| When checking the transport information section of the SDS | Shipper / Manufacturer | Confirm the UN number, proper shipping name, Class 3 designation, packaging group, subsidiary hazards, and marine pollutant status. | If any fields are blank or unclear, request a manufacturer confirmation letter or hazardous materials evaluation documents. |
| When receiving the Dangerous Goods Declaration | Shipper / Declarant | Verify that the UN number, name, and quantity on the DGD, SDS, invoice, packing list, and external markings match. | If there are discrepancies, correct them before submission. |
| When arranging maritime transport | Shipping Line / NVOCC / CFS / Consolidator | Check the IMDG Code compliance, shipping line acceptance, CFS gate-in acceptance, LCL consolidation compatibility, and marine pollutant labeling. | If not accepted, consider alternative shipping lines, different CFS, converting to FCL, or other sailings. |
| When arranging air transport | Airline / Air Agent / Courier | Confirm IATA Dangerous Goods Regulations compliance, quantity limits, packaging standards, passenger aircraft acceptance, and cargo aircraft restrictions. | If rejected, consider sea transport, cargo aircraft flights, or different airlines. |
| When domestic storage or delivery is required | Hazardous Cargo Warehouse / Delivery Company / Consignee | Check classification under Fire Services Act Class 4 hazardous materials, threshold quantities, storage limits, and delivery conditions. | If general warehouses are not permitted, explore specialized hazardous cargo or dangerous goods warehouses. |
| When using small quantity hazardous materials or Limited Quantity provisions | Shipper / Shipping Line / Airline / CFS | Confirm compliance with quantity, packaging, labeling, documentation, and carrier conditions. | If conditions are not met, rebook as regular hazardous materials. |
| Final verification before physical gate-in | Shipper / Warehouse / CFS / Airline Cargo Terminal | Inspect container condition, leaks, labels, UN number markings, orientation marks, and consistency with DGD. | If deficiencies are found, perform repacking, label correction, and document revision before gate-in. |
Example 1: Case Where Water-Based Paint Was Requested as General Cargo
The shipper explained that since it was water-based paint, it was not hazardous and requested sea transport as regular cargo.
However, upon checking the SDS, it was found to contain a small amount of organic solvents and alcohol-based components, with transport information indicating UN1263 PAINT, Class 3, Packaging Group III.
In this case, the freight forwarder should not classify the cargo as general cargo based solely on the "water-based" product description. The forwarder must verify Section 14 of the SDS, flash point, solvent content, UN number, packaging group, and acceptance eligibility with the carrier and CFS.
If the shipping line or CFS refuses acceptance, alternatives such as a different shipment, FCL consolidation, another CFS, or temporary storage in a hazardous materials warehouse should be considered.
Example 2: A Case Where the Classification Changed for Adhesive Previously Shipped as Non-Hazardous
This case involves an adhesive that was previously transported as non-hazardous cargo, where the shipper requested reshipment stating it was the “same product as last time.”
Upon reviewing the latest SDS, it was found that due to formulation changes by the manufacturer altering the solvent content, the current shipment must be handled as Class 3, UN1133 ADHESIVES.
Even if there is a track record of shipping as non-hazardous cargo in the past, classification may change if there are SDS updates, formulation changes, supplier changes, or changes in the country of manufacture.
Freight forwarders should not rely solely on past precedents. They must verify the latest SDS for the current shipment, flash point, packaging group, hazardous materials declaration, and the acceptance conditions of the shipping line or airline.
Example 3: Case of Switching Planned Maritime Transport of Alcohol Products to Air Transport
Due to shipment delays, the shipper requested to switch alcohol-containing products from maritime to air transport.
Although the cargo can be accepted as Class 3 under maritime transport, air transport may impose quantity limits, packaging standards, passenger aircraft restrictions, or airline-specific conditions that result in refusal of acceptance or limitation to cargo aircraft only.
The freight forwarder should recheck the SDS, IATA Dangerous Goods Regulations, airline requirements, quantity per package, packaging, labels, and dangerous goods declaration.
If the airline cannot accept the cargo, the freight forwarder should propose to the shipper continuing maritime transport, cargo aircraft service, alternative airlines, different routes, or rescheduling the delivery date.
Specific Example 4: Case Where Storage Confirmation under Fire Services Act Class 4 Was Not Obtained
Although the Class 3 cargo was successfully arranged for maritime transport, an attempt to store it at a general warehouse for several days before CFS in-gate was rejected due to the possibility of it being classified as a Class 4 hazardous material under the Fire Services Act.
Verification of Class 3 for international transport and confirmation of Class 4 hazardous materials classification under the Fire Services Act for domestic storage are separate matters. Even if the shipping line accepts the cargo, a general warehouse may not.
The freight forwarder should check the SDS, materials confirming applicability under the Fire Services Act, storage quantity, designated quantity thresholds, packaging form, and storage duration, and confirm whether acceptance by hazardous materials or specialized hazardous materials warehouses is possible.
If no suitable storage location can be secured, options such as direct delivery to the CFS, adjusting the in-gate date, changing the shipping date, or arranging an alternative warehouse should be considered.
Information to Confirm with the Shipper
For cargo that may fall under Class 3, the freight forwarder should promptly verify the following information with the shipper:
- Whether the latest version of the SDS is available.
- Whether Section 14 of the SDS lists the UN number, proper shipping name, Class 3, and packaging group.
- Whether flash point, initial boiling point, concentration, composition, and aqueous or oily nature are confirmed.
- Whether a dangerous goods declaration is required.
- Whether the dangerous goods declaration, SDS, invoice, and packing list are consistent.
- Whether there are any subsidiary hazards or marine pollutant classifications.
- Whether the application of limited quantity, excepted quantity, or small quantity exemptions is being considered.
- Whether conditions differ between maritime and air transport.
- Whether the cargo is subject to Class 4 hazardous materials under the Fire Services Act.
- Whether the cargo is acceptable to hazardous goods warehouses, CFS, shipping lines, airlines, and inland delivery companies.
- Whether there are additional regulations or restrictions on storage and delivery imposed by the importing country.
Common Misunderstandings
Class 3 hazards often lead not only to safety risks but also to operational issues caused by misconceptions in practice.
| Misunderstanding | Practical Consideration | What Should Be Confirmed |
|---|---|---|
| Water-based paints are not hazardous materials | Even water-based paints may contain solvents or alcohol. | Check the SDS transport information, flash point, and solvent content. |
| Low concentration alcohol-containing products are not a problem | It is necessary to verify not only concentration but also flash point, volume, packaging type, and transport mode. | Confirm SDS, concentration, flash point, container capacity, and air/sea transport conditions. |
| Because it was shipped as non-hazardous before, it is okay this time as well | Classification may change due to SDS revisions, formulation changes, manufacturer changes, or change of manufacturing country. | Review the latest SDS, product specifications, and manufacturer feedback for this shipment. |
| Verification under the Fire Services Act alone is sufficient | The Fire Services Act covers domestic storage and handling; it differs from hazardous materials classification for international transport. | Check SDS Section 14, UN number, IMDG Code, and IATA Dangerous Goods Regulations. |
| Declaration is not required for small quantities of hazardous materials | Small quantity hazardous materials still have applicable conditions, labeling, documentation, and acceptance requirements. | Confirm Limited Quantity provisions, small quantity exemptions, carrier conditions, and labeling requirements. |
| If there is an SDS, shipping lines and airlines will definitely accept the cargo | Each shipping company, airline, and warehouse may have acceptance restrictions and internal rules. | Verify acceptance conditions with the shipping line, airline, CFS, and hazardous materials warehouse. |
| If accepted for sea transport, it should also be accepted by air | Air transport has different quantity limits, packaging standards, and restrictions on carriage by passenger aircraft. | Check the IATA Dangerous Goods Regulations, airline-specific conditions, packaging, and quantity. |
| Two-component products can be confirmed in aggregate by product unit | The main agent and hardener may have different UN numbers, hazard classes, and packaging requirements. | Confirm each component’s SDS, hazardous materials declaration, packaging, and quantity. |
Points Freight Forwarders Should Note
Freight forwarders should not treat cargo simply as general goods when receiving product names such as "paint," "fragrance," "cleaning agent," or "alcohol products" from the shipper. For items potentially classified under Class 3, it is essential to check the SDS and make an early determination on hazardous material classification.
- Confirm the SDS is the latest version.
- Verify that the transport information section of the SDS includes the UN number, proper shipping name, class, and packaging group.
- Ensure the hazardous material declaration matches the SDS information.
- Check for water-based or oil-based content, concentration, and whether the formulation has changed.
- Confirm whether the shipping line or airline accepts the relevant UN number.
- Check if handling conditions differ between LCL, FCL, and air cargo.
- Verify if storage in a hazardous materials warehouse is required.
- Check for any domestic storage or in-gate restrictions under the Fire Services Act hazardous materials regulations.
- Confirm whether there are additional import restrictions in the destination country.
- Clarify any uncertainties with the shipper or manufacturer in writing.
Important Points
Class 3 cargo poses risks of accidents due to leakage, volatilization, ignition, or contact with ignition sources. In particular, defective containers, overfilling, incorrect labeling, incomplete SDS, and errors in the hazardous materials declaration can cause shipment delays or refusal of acceptance.
- Ensure that damaged containers or cargo with leaks are not accepted.
- Pay close attention to deficiencies in hazardous material labels, UN number display, and markings.
- Avoid exposure to ignition sources, heat sources, direct sunlight, and high-temperature environments.
- Confirm ventilation, temperature control, and segregated storage.
- Verify that storage is not in inappropriate locations such as aisles, emergency exits, or near stairways.
- Be alert to discrepancies between the hazardous materials declaration and the actual cargo content.
- Separately confirm compliance with the Fire Services Act, IMDG Code, IATA Dangerous Goods Regulations, and import country regulations.
- For air transport, always verify whether carriage on passenger aircraft is permitted, if cargo aircraft only, and differences among airlines.
Summary
Hazardous Materials Class 3 covers flammable liquids and is one of the most frequently handled hazard classes in international logistics. Even common products such as alcohols, solvents, paints, adhesives, fragrances, and detergents can qualify as hazardous materials depending on their flash point and composition.
For Class 3 cargo, it is essential to verify the SDS, UN number, proper shipping name, packaging group, flash point, initial boiling point, and hazardous material declaration. Additionally, distinctions based on water-based or oil-based formulations, concentration, compositional changes, classification under the Fire Services Act Category 4 dangerous goods, and differences between maritime and air transport must be carefully confirmed.
Freight forwarders and customs brokers should not judge cargo as non-hazardous based solely on product names. Instead, they must separately assess transport hazard classifications, domestic storage regulations, and importing country requirements to prevent shipment delays, warehouse rejections, labeling deficiencies, and declaration errors.
The key point of this article is to approach Class 3 not merely as the term “flammable liquid,” but as a practical logistics judgment combining SDS, flash point, initial boiling point, packaging group, UN number, Fire Services Act Category 4 status, maritime and air transport differences, and acceptance conditions at CFS, warehouses, and during inland delivery.
