Chemical Shipping from Global: Class 3, 6, and 8 Dangerous Goods Guide

China is one of the world's largest producers and exporters of chemicals, supplying everything from industrial solvents and resins to agricultural intermediates and pharmaceutical raw materials. Shipping these products internationally requires strict compliance with the IMDG Code (International Maritime Dangerous Goods Code), specialized packaging, precise documentation, and carrier-specific approval processes.

This guide focuses on three of the most commonly shipped chemical hazard classes from Global: Class 3 (Flammable Liquids), Class 6 (Toxic and Infectious Substances), and Class 8 (Corrosive Substances). We cover classification principles, packaging options (including IBC totes and ISO tanks), MSDS requirements, carrier approval procedures, and emergency response protocols — everything you need to ship chemicals safely and legally from Chinese ports.

IMDG Code Classification Fundamentals

Every chemical shipment begins with proper classification. Under the IMDG Code, chemicals are assigned to one of nine hazard classes based on their physical and chemical properties. Classification determines packaging requirements, labeling, stowage rules, and segregation obligations.

Classification requires three key pieces of information:

• UN Number: A four-digit code assigned by the United Nations that identifies the specific substance (e.g., UN1263 for paint-related material, UN2735 for amines liquid corrosive)
• Proper Shipping Name: The official technical name used on all shipping documents
• Packing Group (PG): Indicates the degree of danger — PG I (great danger), PG II (medium danger), PG III (minor danger). This determines the packaging specification required.

Classification must be performed by a qualified professional based on the product's Material Safety Data Sheet (MSDS) and, where necessary, laboratory test results. Incorrect classification is the leading cause of chemical shipment rejections and can result in fines, cargo confiscation, and legal liability.

Class 3: Flammable Liquids

Class 3 covers liquids with a flash point of 60°C (140°F) or below. This is one of the largest categories of dangerous goods exported from Global, encompassing a wide range of industrial chemicals.

Common Class 3 Chemicals from Global

• Paints and coatings (UN1263) — China is a major exporter of industrial paints, marine coatings, and automotive finishes
• Resins and adhesives (UN1866) — epoxy, polyurethane, and acrylic resins used in manufacturing
• Methanol and ethanol (UN1230, UN1170) — industrial solvents and fuel additives
• Acetone and MEK (UN1090, UN1193) — widely used industrial solvents
• Toluene and xylene (UN1294, UN1307) — petrochemical intermediates
• Essential oils and flavor compounds (various UN numbers) — many contain flammable alcohol bases

Packing Groups and Flash Points

Packing Group	Flash Point Range	Danger Level	Packaging Requirement
PG I	< 23°C (initial boiling point ≤ 35°C)	Great danger	UN-spec steel drums, IBCs
PG II	< 23°C (initial boiling point > 35°C)	Medium danger	UN-spec drums, jerricans, IBCs
PG III	23°C to 60°C	Minor danger	UN-spec packaging or IBCs

Packaging Options for Class 3

Steel or plastic drums (200L) are the most common packaging for Class 3 chemicals. For PG I and II, UN-specification packaging marked with the UN symbol, packing group, and year of manufacture is mandatory. For larger volumes, IBC totes (1,000L) provide a cost-efficient alternative, and for bulk quantities, ISO tank containers are preferred.

Class 6: Toxic and Infectious Substances

Class 6 is divided into two subclasses: Class 6.1 (Toxic Substances) and Class 6.2 (Infectious Substances). For chemical shipping from Global, Class 6.1 is far more common, covering pesticides, agricultural chemicals, and industrial toxic compounds.

Common Class 6.1 Chemicals from Global

• Pesticides and agrochemicals (UN2588, UN2757, UN2902) — China is the world's largest pesticide exporter
• Aniline and nitrobenzene (UN1547, UN1662) — chemical intermediates for dyes and pharmaceuticals
• Phenol derivatives (UN1671, UN2821) — industrial disinfectants and chemical precursors
• Cyanide compounds (UN1680, UN1689) — mining and electroplating chemicals (highly restricted)
• Chlorinated organic compounds (various UN numbers) — solvents and intermediates

Toxicity Classification Criteria

Class 6.1 substances are assigned packing groups based on their toxicity, measured by oral, dermal, and inhalation LD50/LC50 values. PG I substances are extremely toxic — even small amounts can be lethal. Carrier acceptance for PG I toxic substances is significantly more restricted, and many shipping lines refuse to transport certain high-toxicity compounds.

Packaging for Class 6.1

Class 6.1 chemicals require hermetically sealed, UN-specification packaging with inner packaging designed to prevent any leakage. For toxic liquids, double-packaging (inner bottle + outer drum) is standard. Desiccants and absorbent materials must be compatible with the chemical. Pesticide formulations are commonly shipped in 200L steel drums, 20L plastic jerricans, or 1,000L IBC totes depending on the formulation type.

Class 8: Corrosive Substances

Class 8 covers substances that cause visible destruction or irreversible alteration to living tissue (skin) or steel/aluminum on contact. This class includes acids, bases, and other highly reactive chemicals — many of which are produced in large quantities in China.

Common Class 8 Chemicals from Global

• Sulfuric acid and hydrochloric acid (UN1830, UN1789) — fundamental industrial chemicals
• Caustic soda (sodium hydroxide) (UN1824) — widely exported in solution form
• Acetic acid and formic acid (UN2790, UN1779) — food, pharmaceutical, and textile industry chemicals
• Amines (UN2735, UN2734) — chemical intermediates for polyurethane and rubber
• Battery acid and electroytes (UN2796) — for lead-acid battery manufacturing
• Corrosive cleaning and treatment compounds — industrial surface treatment chemicals

Special Considerations for Corrosives

Class 8 chemicals present unique packaging challenges because they can react with packaging materials. For example, hydrochloric acid cannot be stored in standard steel drums — it requires specialized rubber-lined tanks or specific plastic containers. Similarly, acetic acid above certain concentrations requires stainless steel or specific polymer IBCs. Packaging material compatibility must be verified against the chemical's MSDS before shipment.

Segregation is also critical for Class 8. Acids and bases must not be stowed in the same container or adjacent cargo holds, as mixing can cause violent exothermic reactions. Class 8 substances must also be segregated from Class 4 (flammable solids), Class 5 (oxidizers), and certain Class 3 liquids per the IMDG segregation table.

IBC Totes vs ISO Tanks: Choosing the Right Packaging

For bulk chemical shipments from Global, the two primary packaging options are IBC totes (Intermediate Bulk Containers) and ISO tank containers. The right choice depends on volume, chemical compatibility, destination infrastructure, and cost.

IBC Totes (1,000L)

IBCs are rigid, reusable containers typically made of high-density polyethylene (HDPE) encased in a steel cage. Each IBC holds 1,000 liters, and 8 IBCs fit into a standard 20-foot container (total 8,000L per 20GP). For UN-specification IBCs, the container must be marked with the UN symbol, IBC code (e.g., 31HA1 for composite IBC with plastic inner receptacle), and year of manufacture.

• Best for: Shipments of 4,000-16,000L; chemicals compatible with HDPE; destinations with limited ISO tank infrastructure
• Advantages: Lower cost per liter than drums; no return logistics; can be stored at destination
• Limitations: Single-use or limited re-use; not suitable for chemicals that degrade HDPE; requires floor stowage in container

ISO Tank Containers

ISO tanks are cylindrical pressure vessels mounted within a standard ISO container frame, typically holding 21,000-26,000 liters. They are the preferred packaging for large-volume chemical shipments and are reusable for many trips.

• Best for: Shipments of 20,000L+; high-volume regular chemical trade; chemicals requiring temperature control or inert gas blanketing
• Advantages: Lowest cost per liter for large volumes; reusable (10-20 year lifespan); available with heating, cooling, and insulation; minimal packaging waste
• Limitations: Requires return logistics (empty tank return to origin); destination must have tank cleaning and discharge facilities; higher upfront booking cost than IBCs for smaller volumes

For shipments under 8,000L, IBCs are almost always more cost-effective. For shipments over 20,000L on regular trade lanes with established tank infrastructure, ISO tanks offer the best value. Between 8,000L and 20,000L, the choice depends on destination infrastructure and return logistics costs.

MSDS and Documentation Requirements

The Material Safety Data Sheet (MSDS), also known as Safety Data Sheet (SDS), is the foundational document for chemical shipping. A complete, accurate MSDS is mandatory for all chemical exports from Global and must accompany every DG shipment. Key MSDS sections relevant to shipping include:

• Section 1: Product identification and recommended use
• Section 2: Hazard identification and GHS classification
• Section 3: Composition/ingredients with CAS numbers
• Section 9: Physical and chemical properties (flash point, boiling point, density, solubility) — critical for IMDG classification
• Section 10: Stability and reactivity — determines segregation requirements
• Section 14: Transport information — must include UN number, proper shipping name, class, packing group

In addition to the MSDS, chemical DG shipments require:

• Dangerous Goods Declaration (DGD): A formal declaration signed by the shipper certifying that the cargo is properly classified, packaged, marked, and labeled per the IMDG Code
• Packing Certificate: Signed by the party who packed the container, confirming compliance with packing requirements
• Container Packing Certificate: For FCL DG shipments, certifying proper stowage and securing
• UN Test Report: For packaging, demonstrating it meets UN specification standards
• Export License: China requires an export license for certain restricted chemicals from the Ministry of Commerce
• CIQ Inspection Certificate: China Inspection and Quarantine may require inspection for certain chemical products

Carrier Approval and Booking Process

All major shipping lines require pre-approval before accepting DG cargo bookings. The approval process typically takes 2-5 business days and involves submitting the MSDS, DGD, and packing list to the carrier's DG compliance department. Carriers review the submission to verify classification accuracy, packaging compliance, and stowage compatibility with other cargo on the vessel.

Each carrier maintains its own list of restricted and prohibited DG cargo. For example, some carriers refuse Class 6.1 PG I substances, while others impose seasonal restrictions on certain Class 3 flammable liquids during summer months in hot-climate routes. Working with an experienced DG freight forwarder who knows each carrier's restrictions saves significant time and avoids rejections.

Emergency Response and Spill Management

Despite all precautions, chemical incidents can occur during transport. The IMDG Code requires that all DG shipments carry an EmS (Emergency Schedules) reference on the DGD, which provides ship crews with specific emergency response instructions for fire, spillage, and exposure scenarios.

Key emergency response measures for the three classes covered in this guide:

• Class 3 (Flammable Liquids): Use foam or dry chemical extinguishers — never water for most Class 3 fires. Contain spills with absorbent booms. Evacuate area if vapor concentration is high.
• Class 6.1 (Toxic Substances): Evacuate immediately and call emergency services. Do NOT attempt cleanup without appropriate PPE (respirator, chemical suit). Contain the area and prevent spread to waterways.
• Class 8 (Corrosives): Neutralize small spills with appropriate neutralizing agents (sodium bicarbonate for acids, citric acid for bases). Flush skin contact areas with copious water for 15+ minutes. Never use water on concentrated sulfuric acid spills — it can cause violent boiling.

Shippers must also ensure that the 24-hour emergency contact number is listed on all documentation. This number connects to a chemical emergency response service that can provide immediate technical guidance to carriers, port authorities, and first responders. SHAQ Logistics maintains 24/7 emergency response support for all DG shipments under our care.

Choosing a Chemical Shipping Forwarder

Chemical shipping demands specialized expertise that not all freight forwarders possess. When selecting a forwarder for chemical exports from Global, verify:

• IMDG Code-certified DG specialists on staff
• Experience with your specific chemical class and UN number
• Established carrier relationships with multiple shipping lines for DG acceptance
• Capability to arrange ISO tank leasing, cleaning, and return logistics
• Knowledge of China's chemical export licensing and CIQ requirements
• 24/7 emergency response capability
• Cargo insurance options for DG shipments

Conclusion

Chemical shipping from Global under IMDG Code Class 3, 6, and 8 is a complex but manageable process when handled by experienced professionals. Proper classification, appropriate packaging selection (IBCs for mid-volume, ISO tanks for bulk), complete MSDS and DGD documentation, and carrier pre-approval are the foundations of successful chemical exports.

The stakes are high — incorrect classification or inadequate packaging can lead to shipment rejections, port accidents, environmental contamination, and legal liability. By partnering with a DG-certified freight forwarder with deep chemical shipping expertise, you can navigate the regulatory landscape with confidence and ensure your chemical cargo reaches its destination safely and on schedule.

SHAQ Logistics has been handling dangerous goods shipping from Global since 2013, with IMDG-certified specialists and established DG acceptance agreements with all major carriers. Contact us for a free chemical shipping consultation and quote within 24 hours.