Shipping Dangerous Goods from Global: IMDG Code Compliance Guide

China is one of the world's largest exporters of chemicals, batteries, fireworks, and other hazardous materials. Shipping dangerous goods (DG) internationally requires strict compliance with the International Maritime Dangerous Goods (IMDG) Code, established by the International Maritime Organization (IMO). Non-compliance can result in cargo rejection, port fines, vessel delays, and even catastrophic safety incidents.

This guide provides a comprehensive overview of how to ship dangerous goods from Global in compliance with the IMDG Code, covering hazard classifications, packaging standards, required documentation, labeling, carrier restrictions, and the Chinese export compliance process.

IMO Dangerous Goods Classification (Class 1-9)

The IMDG Code classifies dangerous goods into nine hazard classes based on the type of danger they present. Every DG shipment must be assigned the correct class before booking. Misclassification is the most common and dangerous compliance failure.

Class	Hazard Type	Common Examples from Global
Class 1	Explosives	Fireworks, flares, ammunition, detonators
Class 2	Gases (compressed, liquefied, dissolved)	LPG, aerosols, refrigerant gases, fire extinguishers
Class 3	Flammable liquids	Paints, solvents, alcohol, gasoline, resins
Class 4	Flammable solids, spontaneously combustible, dangerous when wet	Matches, metal powders, calcium carbide, camphor
Class 5	Oxidizing substances and organic peroxides	Hydrogen peroxide, ammonium nitrate fertilizers, peroxides
Class 6	Toxic and infectious substances	Pesticides, cyanides, medical waste, vaccines
Class 7	Radioactive material	Uranium compounds, medical isotopes, industrial gauges
Class 8	Corrosive substances	Sulfuric acid, hydrochloric acid, battery acid, drain cleaners
Class 9	Miscellaneous dangerous goods	Lithium batteries, dry ice, asbestos, magnets, self-heating bags

UN Numbers and Proper Shipping Names

Every dangerous good is assigned a four-digit UN number by the United Nations Committee of Experts on the Transport of Dangerous Goods. The UN number uniquely identifies the substance and determines its packaging, labeling, and documentation requirements.

For example, lithium ion batteries shipped alone are assigned UN3480 with the proper shipping name "Lithium ion batteries." This UN number dictates that the batteries must be packed according to Packing Instruction P903 of the IMDG Code, labeled with the Class 9 lithium battery hazard label, and accompanied by specific documentation.

When preparing a DG shipment from Global, you must determine:

• UN Number — the four-digit identifier
• Proper Shipping Name — the official IMDG Code name
• Class and Division — hazard class and any applicable sub-risk
• Packing Group — I (great danger), II (medium danger), or III (minor danger)
• Special Provisions — any additional requirements specific to the substance

Packaging Requirements

DG packaging must meet stringent UN performance standards. The packaging type required depends on the hazard class, packing group, and quantity being shipped.

UN-Certified Packaging

All DG shipments must use packaging that has been tested and certified to UN standards. Certified packaging bears a UN mark that includes:

• The UN symbol (the letters "UN" in a circle)
• Packaging type code (e.g., 4G = fiberboard box, 1A1 = steel drum)
• Packing group for which it was tested (X=I, Y=II, Z=III)
• Gross mass or specific gravity rating
• Year of manufacture and country code
• Manufacturer's code

In China, UN-certified packaging manufacturers must be registered with and inspected by the China National Accreditation Service for Conformity Assessment (CNAS). SHAQ Logistics can help source approved packaging suppliers for your specific DG cargo.

Quantity Limits

The IMDG Code defines maximum quantities per inner and outer packaging based on the packing group. Packing Group I substances have the most restrictive limits, while Packing Group III allows higher quantities. For certain dangerous goods, "Limited Quantities" provisions allow reduced packaging requirements for small quantities shipped under specific marking and documentation rules.

MSDS and DGD Documentation

Two critical documents are required for every DG shipment from Global: the Material Safety Data Sheet and the Dangerous Goods Declaration.

Material Safety Data Sheet (MSDS)

The MSDS (also called Safety Data Sheet or SDS) is a comprehensive document that provides detailed information about the chemical and physical properties of the substance, health and safety hazards, handling procedures, emergency response measures, and disposal considerations. The MSDS must be:

• Issued by the manufacturer or a qualified testing laboratory
• Written in English (and Chinese for domestic transport)
• Updated periodically to reflect current regulatory requirements
• Based on the Globally Harmonized System (GHS) of classification

In China, many DG exporters obtain MSDS reports from recognized third-party testing institutions such as SGS, TÜV, Intertek, or CTI (Centre Testing International). These reports are valid for one year and must be renewed before expiration.

Dangerous Goods Declaration (DGD)

The DGD is the formal legal document that declares the shipment complies with IMDG Code requirements. It is typically completed by the shipper or their authorized DG freight forwarder. The DGD must include:

• Shipper and consignee details
• UN number, proper shipping name, class, and packing group
• Number and type of packages
• Total quantity of dangerous goods
• Packing instruction used
• Flash point (for Class 3 flammable liquids)
• Emergency response contact information
• Container packing certificate (for FCL DG shipments)

Labeling and Marking

Every DG package and container must display specific labels and marks as specified by the IMDG Code. These visual indicators allow handlers, carriers, and emergency responders to quickly identify the hazards present.

Package-Level Labels

• Class Hazard Labels: Diamond-shaped labels (100mm x 100mm minimum) with the class number at the bottom. Colors and symbols vary by class (e.g., red flame for Class 3, skull and crossbones for Class 6.1).
• Subsidiary Risk Labels: Additional hazard labels if the substance presents secondary hazards.
• Lithium Battery Mark: Required for all lithium battery shipments, indicating the UN number and a telephone number for emergency information.
• Orientation Arrows: Required for packages containing liquids in inner packagings.
• Limited Quantity Mark: A specific mark for packages shipped under the Limited Quantities exemption.

Container-Level Placards

For FCL DG shipments, the container exterior must display:

• Placards (250mm x 250mm) on all four sides showing the hazard class
• UN Number displayed on all four sides (black digits on white background, minimum 65mm height)
• Marine Pollutant Mark if applicable (a triangle with a dead fish and tree)
• Technical Name for certain substances where required

Carrier Restrictions and Limitations

Not all shipping lines accept all classes of dangerous goods. Each carrier has its own DG acceptance policy based on vessel type, route, port restrictions, and internal risk assessments.

Common Carrier Restrictions

• Class 1 (Explosives): Very few carriers accept Class 1.1-1.3 explosives. Fireworks (Class 1.3G, 1.4G) are more widely accepted but require special stowage.
• Class 7 (Radioactive): Strictly regulated. Many carriers refuse radioactive materials entirely. Those that accept them require advance approval and special stowage arrangements.
• UN3480 Lithium Ion Batteries: Some carriers restrict standalone lithium ion batteries (UN3480), especially by sea. Many require state-of-charge limitations (max 30%) and additional packaging protections.
• Self-Reactive Substances (Class 4.1): Temperature-controlled stowage may be required, limiting which vessels and routes can carry them.

Major carriers operating from Global—including Maersk, MSC, CMA CGM, COSCO, ONE, and Hapag-Lloyd—each publish DG acceptance matrices on their websites. SHAQ Logistics maintains updated carrier restriction databases and can advise which shipping line is best for your specific DG cargo.

China Export Compliance Process

Shipping DG from Global involves multiple regulatory checkpoints. The following steps outline the typical export compliance process:

Step 1: Obtain Required Certificates

Before booking, you need the following documents from the manufacturer or testing laboratory:

• MSDS/SDS Report (valid within one year)
• Conditions of Transport Certificate (运输条件鉴定书) issued by a recognized institution
• Export License for certain restricted chemicals
• Hazardous Chemicals Registration Certificate (for chemicals listed in China's Catalog of Hazardous Chemicals)

Step 2: DG Booking and Carrier Approval

Submit the MSDS and DGD to your freight forwarder for carrier booking approval. The carrier's DG department reviews the documents and either approves or rejects the booking. This approval process typically takes 2-5 business days. Certain high-risk cargoes may require additional review or stowage plans.

Step 3: Packaging and Container Loading

DG cargo must be packed in UN-certified packaging at a facility approved for DG handling. For FCL shipments, container packing must be supervised by a qualified DG packing inspector who issues a Container Packing Certificate. The certificate confirms that:

• The container was clean, dry, and fit for purpose
• Cargo was properly segregated according to IMDG segregation tables
• Packages were secured to prevent movement during transit
• Placards and marks were correctly applied

Step 4: Customs Declaration

DG shipments require specialized customs declaration. In China, the customs system flags DG HS codes automatically, requiring additional documentation review. The exporter or their agent submits:

• DGD and MSDS
• Commercial invoice and packing list
• Conditions of Transport Certificate
• Export license (if applicable)
• Carrier DG approval confirmation

Step 5: Port Handling and Loading

Chinese ports have designated DG handling areas. Containers must arrive at the port within the carrier-specified DG cutoff window (usually 2-3 days before vessel departure). Port authorities verify placards and documentation before allowing the container into the DG storage area. Stowage plans are finalized by the carrier's DG officer in compliance with IMDG stowage and segregation requirements.

Common DG Export Challenges from Global

Exporters frequently encounter these challenges when shipping DG from Global:

• Incomplete or incorrect MSDS: Many small manufacturers lack proper testing capabilities. Always verify the MSDS is from a recognized lab and matches the actual product.
• Booking rejection during peak season: DG slots are limited on vessels. Book 2-3 weeks in advance during peak shipping periods (pre-Chinese New Year, pre-Christmas).
• Port-specific restrictions: Some Chinese ports restrict certain DG classes. For example, Shenzhen Yantian has specific limits on Class 3 flammable liquids during summer high-temperature months.
• Carrier policy changes: Carrier DG policies change frequently, especially for lithium batteries. Always confirm current acceptance before committing to a booking.

Why Choose a DG-Certified Freight Forwarder

Shipping dangerous goods is not a do-it-yourself process. A DG-certified freight forwarder provides:

• Trained DG specialists who understand IMDG Code requirements
• Carrier relationships and knowledge of current DG acceptance policies
• Assistance with MSDS review and DGD preparation
• UN-certified packaging sourcing and container packing supervision
• Emergency response support throughout the shipment lifecycle

SHAQ Logistics has been handling DG shipments from Global since 2013. Our team is trained in IMDG Code compliance and maintains relationships with all major carriers to ensure your dangerous goods shipments are accepted, documented, and transported safely. Learn more about our dangerous goods shipping services.

Conclusion

Shipping dangerous goods from Global requires meticulous attention to classification, packaging, documentation, labeling, and carrier requirements. The IMDG Code exists to protect lives, vessels, and the environment, and compliance is not optional—it is a legal and moral obligation.

By understanding the nine hazard classes, ensuring proper UN-certified packaging, preparing accurate MSDS and DGD documents, applying correct labels and placards, and working with a DG-certified freight forwarder, you can navigate the complexities of DG shipping with confidence. As China's exports of lithium batteries, chemicals, and other hazardous materials continue to grow, having a reliable logistics partner is more important than ever.

Need to ship dangerous goods from Global? Contact SHAQ Logistics for expert DG handling, competitive rates, and full IMDG Code compliance support.