Guidance on Physicochemical Property Data for International Transport of Chemicals/Dangerous Goods
Ensuring the safe and compliant transport of chemicals via international logistics (sea/air freight) requires accurate understanding and declaration of their physicochemical and hazardous properties. This guidance, based on the UN Globally Harmonized System of Classification and Labelling of Chemicals (GHS) and industry practice, outlines the core data required for different material states.
1. Essential Transport Information in the Safety Data Sheet (SDS)
The SDS forms the foundation of transport documentation. Its "Physical and Chemical Properties" section must contain the following applicable information (or be marked as not applicable):
- Physical state, color, odor: Applicable to all states (gas, liquid, solid) for basic identification.
- Boiling point, melting/freezing point: Influence packaging design and transport conditions.
- Flash point: A critical parameter used to classify flammable liquids (e.g., IMDG Code Class 3 / IATA Class 3). Applicable to liquids only.
- Flammability/explosive limits: Key for assessing fire/explosion risks of gases and some liquid vapors. Generally not applicable to solids.
- Auto-ignition temperature: Crucial for evaluating risks of self-heating substances and certain flammable liquids.
- Vapor pressure, vapor density, density: Affect packaging integrity, stowage, and ventilation requirements.
2. Key Parameters Determining Hazard Classification and Packaging
The following properties directly correspond to hazard classes and packing groups under transport regulations (e.g., IMDG Code, IATA DGR):
- Explosive properties: Sensitivity data.
- Oxidizing properties: Strength of oxidizing ability.
- Organic peroxide/Self-reactive properties: Control temperature, Self-Accelerating Decomposition Temperature (SAPT).
- Reactivity with water.
- Corrosivity: Metal corrosion data.
3. Specific Parameters for Particular Cargo Types
- Solids/Dusts: Dust explosion properties (e.g., Minimum Ignition Energy, Deflagration Index) are decisive for classification as flammable solids and determining required explosion protection levels during handling.
- Polymerizing substances: The Self-Accelerating Polymerization Temperature (SAPT) determines if inhibitors or temperature-controlled transport is needed.
Conclusion
Comprehensive and accurate product property data is a prerequisite for compliant transport classification, proper packaging selection, preparation of transport documents, and safe handling. Shippers must obtain a complete SDS from their suppliers and communicate all relevant properties to their logistics provider.
Key Takeaways for Supply Chain Stakeholders
- Always request a complete, GHS-compliant Safety Data Sheet (SDS) from your supplier before shipping any chemical product.
- Verify that critical parameters like flash point, boiling point, and auto-ignition temperature are clearly stated and validated.
- For solids/dusts, ensure dust explosion properties are assessed and documented to determine proper handling requirements.
- Work with a freight forwarder experienced in dangerous goods to interpret SDS data and ensure correct hazard classification and transport planning.
- Never rely on incomplete or outdated property data - inaccurate information can lead to misclassification, cargo rejection, fines, and safety incidents.
Disclaimer: This guide provides general information based on UN GHS and IMDG Code regulations. Always consult certified dangerous goods personnel, your freight forwarder, and the latest regulatory editions for specific cargo requirements.