Isocyanate Shipping: Polyurethane Chemical MDI TDI IATA IMDG Transport

Shipping Isocyanates for Polyurethane Manufacturing

Isocyanates including MDI (methylene diphenyl diisocyanate) and TDI (toluene diisocyanate) are essential raw materials for polyurethane foam, coating, and adhesive manufacturing. These highly reactive chemicals are classified as Class 6.1 toxic substances under IATA DGR and IMDG Code, with additional respiratory sensitization hazards that make worker protection paramount throughout the transport chain.

Isocyanate Classifications

TDI (UN2078, Class 6.1, PG II) is the more toxic of the common isocyanates with significant vapor pressure at ambient temperature. MDI (UN2489, Class 6.1, PG III) has lower vapor pressure and acute toxicity but remains a serious respiratory sensitizer. Polymeric MDI variants may have different classifications based on monomer content. Isocyanate blends and prepolymers require individual classification assessment.

IATA DGR Air Transport

Air shipping of isocyanates under IATA DGR follows Packing Instructions 654 (liquids) and 655 (solids) for Class 6.1 toxic substances. TDI (PG II) has more restrictive quantity limits than MDI (PG III). Temperature during air transport must prevent crystallization of MDI products below their pour points. Air freight coordination for isocyanates requires verification of carrier acceptance and compatibility with adjacent cargo.

IMDG Code Ocean Transport

Bulk isocyanate shipping under the IMDG Code serves polyurethane manufacturers worldwide. ISO tank containers and IBCs accommodate the large volumes that foam and coating producers consume. Temperature control prevents MDI crystallization during ocean transit. Port handling must prevent isocyanate container exposure to moisture, which causes dangerous CO2 gas evolution and product degradation.

Moisture Sensitivity Challenges

Isocyanates react vigorously with water, generating CO2 gas and forming solid polyurea. Container headspace pressure can build dangerously if moisture enters isocyanate containers during transport or storage. Nitrogen blanket systems, moisture-proof closures, and humidity-controlled warehouse environments protect product integrity and prevent container over-pressurization.

South Florida Polyurethane Industry

South Florida’s construction, marine, and manufacturing industries consume significant isocyanate volumes for insulation foam, marine coatings, and industrial adhesives. Local distribution from warehouse facilities serves the regional polyurethane processing industry with just-in-time delivery of these temperature- and moisture-sensitive chemicals.

Go Freight’s Isocyanate Logistics

Go Freight provides isocyanate shipping from South Florida. Our toxic substance team manages the temperature control, moisture protection, and regulatory compliance that isocyanate supply chains demand.