Flammable Liquids (Class 3 Dangerous Goods) Maritime Customs Clearance: A Practical Guide

PART 01 Key Points for Shipping Flammable Liquids by Sea

In international chemical trade, the transportation of Class 3 Dangerous Goods – flammable liquids – requires strict compliance with maritime safety regulations due to their specific chemical properties, making it a critical industry focus.

1. Fundamental Characteristics of Flammable Liquids

Understanding these properties is essential for safe and efficient transportation:

Flammable liquids refer to substances that exist in liquid state at normal temperature, are easily ignited when exposed to fire, and have a flash point below 60°C. Their characteristics include: flammable and explosive vapors, thermal expansibility, tendency to accumulate static electricity, high fluidity and diffusibility, reactivity with strong oxidizers/acids, and varying degrees of toxicity.

In international maritime transport, the three most critical indicators for Class 3 dangerous goods are flash point, boiling point, and explosive limits.

• Flash point: Core safety parameter

  • Low flash point: < -18°C (e.g., Diethyl Ether)

  • Medium flash point: -18°C ~ 23°C (e.g., Benzene)

  • High flash point: 23°C ~ 61°C (e.g., Kerosene)

• Boiling point: Well-understood concept (no further explanation here)

• Explosive limits: When flammable vapors mix with air and reach certain concentrations, they explode upon contact with ignition sources. This explosive concentration range is called the explosive limit.

2. Common Packaging

Packaging forms typically include: plastic drums, steel drums, IBC totes, cartons, and TANK containers.

PART 02 Life-or-Death Checklist for Customs Clearance – Essential Documents

• Shipping line application form

• Sea shipment instruction letter

• Dangerous Goods Packaging Performance Certificate

• Technical Specification for Packaged Dangerous Goods

• Material Safety Data Sheet (MSDS)

PART 03 Maritime Declaration Process & Critical Points

Maritime declaration is the core step for dangerous goods export – must be completed 24 hours before vessel arrival!

• Declaration Process

  • Photograph the container loading process (showing securing measures)

  • Record container number, seal number, and loaded weight

• Submission Requirements

  • Dangerous goods vehicles must be weighed at customs-supervised scales (declared vs. actual weight error <5%)

• Maritime Release

  • Upon approval, Maritime Safety Administration issues "Dangerous Goods Fitness Certificate"

  • No release = No vessel loading!

Common Rejection Reasons

❌ MSDS lacks IMDG Code shipping clauses

❌ Expired Dangerous Goods Packaging Certificate (validity: 1 year)

❌ Loading photos missing leak-proof measures (e.g., absorbents, trays)

PART 04 Customs Declaration & Inspection Strategies

1. Declaration Essentials

• Ensure complete declaration elements including UN number, hazard class, packaging type, flash point.

• Maintain document consistency: commercial invoice, packing list, and customs declaration must 100% match.

2. Handling Customs Inspection

If inspected, ensure:

• Goods packaging displays GHS labels (with UN number, hazard symbols)

•  Carry original MSDS and Packaging Certificate

•  Cooperate with container inspection (prepare unpacking tools)

PART 05 Loading & Bill of Lading Considerations

Final step where details determine success!

1. Loading Requirements

• Keep away from heat sources: Containers should be placed in ventilated vessel deck areas

• Anti-static measures: Use conductive grounding wires

• Segregated storage: Load separately from oxidizers and acids

2.  B/L Verification

• Display IMDG CLASS 3 identification

• Correctly note flash point (e.g., FLASHPOINT: 23℃)

• Provide 24-hour emergency contact number