Description

Trimethylhexamethylene Diisocyanate is a specialized aliphatic diisocyanate monomer, a key building block for high-performance polyurethane materials. Its unique structure, featuring a branched hexamethylene chain, provides superior light stability, chemical resistance, and mechanical properties to the final polymers. This product is essential for formulators and manufacturers in the coatings, adhesives, sealants, and elastomers (CASE) industries seeking durable, weatherable, and yellowing-resistant solutions.

Application

• High-Performance Polyurethane Coatings: Used in automotive clear coats, industrial maintenance paints, and coil coatings where exceptional UV stability and color retention are critical.
• Light-Stable Adhesives & Sealants: Formulation of premium-grade adhesives and sealants for aerospace, automotive, and construction applications requiring long-term durability outdoors.
• Aliphatic Polyurethane Elastomers: Production of cast elastomers, rollers, and gaskets that demand resistance to yellowing, hydrolysis, and harsh chemicals.
• Synthetic Leather & Textile Coatings: Manufacturing of high-quality artificial leather and protective textile finishes with excellent flexibility and lightfastness.
• Specialty Crosslinking Agent: Acts as a crosslinker in advanced polymer systems to enhance thermal stability and mechanical strength.
• Automotive & Industrial Plastics: Modification of plastic components to improve surface hardness, scratch resistance, and weatherability.

Basic Information

Product Name	Trimethylhexamethylene Diisocyanate
CAS No.	28679-16-5
Molecular Formula	C11H18N2O2
Molecular Weight	210.27 g/mol
Synonyms	TMHDI; 1,6-Diisocyanato-2,2,4(2,4,4)-trimethylhexane; 2,2,4-Trimethylhexamethylene Diisocyanate; 2,4,4-Trimethylhexamethylene Diisocyanate; TMDI; Isophorone Diisocyanate (IPDI) isomer; Vestanat® TMDI (Evonik); Aliphatic Diisocyanate TMD; Trimethyl-1,6-hexane Diisocyanate
EINECS	249-150-7

Quality Control

Our Trimethylhexamethylene Diisocyanate is manufactured under strict quality management systems to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including assay, isocyanate content, and impurity profile analysis via GC and HPLC. A Certificate of Analysis (COA) detailing all specifications is provided with every shipment to guarantee compliance with your technical requirements and industry standards.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at temperatures between 15°C and 25°C (59°F and 77°F). Due to its hygroscopic (moisture-sensitive) nature, containers must be kept tightly sealed under a dry inert atmosphere (e.g., nitrogen) to prevent reaction with atmospheric moisture. Keep away from heat, open flames, and incompatible materials such as alcohols, amines, and strong bases.

Specification

Item	Specification
Appearance	Clear, colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (GC)	≥ 99.0 %
Isocyanate Content (NCO)	39.5 - 40.5 %
Hydrolyzable Chloride	≤ 10 ppm
Total Chloride	≤ 20 ppm
Viscosity at 25°C	Contact for details
Density at 20°C	Contact for details
Flash Point	Contact for details

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.