Description

Hexamethylene Diisocyanate Trimer is a polyfunctional aliphatic isocyanate, specifically the trimeric form of hexamethylene diisocyanate (HDI). This compound is valued for its excellent light stability, chemical resistance, and ability to form high-performance, durable polymer networks. It is a critical raw material for manufacturers in the coatings, adhesives, and specialty elastomers industries seeking to enhance product longevity and performance under demanding environmental conditions.

Application

• High-Performance Polyurethane Coatings: A key crosslinker in automotive OEM, refinish, and industrial coatings, providing exceptional gloss retention, weatherability, and chemical resistance.
• UV-Stable Adhesives and Sealants: Used in formulations for construction, aerospace, and automotive applications where resistance to yellowing and degradation from sunlight is paramount.
• Elastomers and Castables: Serves as a hardener component in the production of specialty polyurethane elastomers, rollers, and gaskets requiring durability and flexibility.
• Powder Coatings: Incorporated as a crosslinking agent in aliphatic polyurethane powder coatings for outdoor architectural and functional metal components.
• Waterborne Polyurethane Dispersions (PUDs): Utilized in the synthesis of environmentally friendly, low-VOC coating systems with high performance characteristics.
• Industrial Maintenance and Marine Coatings: Provides long-term protection for infrastructure, offshore platforms, and marine vessels exposed to harsh weather and corrosive environments.

Basic Information

Product Name	Hexamethylene Diisocyanate Trimer
CAS No.	28574-90-5
Molecular Formula	C21H30N6O6
Molecular Weight	462.50 g/mol
Synonyms	HDI Trimer; HDI Isocyanurate; Hexamethylene Diisocyanate Isocyanurate; Poly(hexamethylene diisocyanate); 1,6-Diisocyanatohexane Homopolymer; Isocyanuric Acid Tris(6-isocyanatohexyl) Ester; Desmodur N 3300 (Trade Name); Tolonate HDT-LV (Trade Name)
EINECS	249-121-8

Quality Control

Our Hexamethylene Diisocyanate Trimer is manufactured under stringent quality management systems. Each batch is analyzed to ensure it meets precise specifications for purity, isocyanate content, viscosity, and color. A comprehensive Certificate of Analysis (COA) is provided with every shipment, detailing the results against our internal standards and typical industry benchmarks for polyisocyanates.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area at temperatures between 15-25°C (59-77°F). This product is hygroscopic (moisture-sensitive) and highly volatile. Containers must be kept tightly sealed under a dry inert gas (e.g., nitrogen) blanket after opening to prevent moisture absorption and polymerization. Keep away from heat, sparks, open flames, and incompatible materials such as alcohols, amines, and strong bases.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Assay (NCO Content)	21.0 - 22.0 %
Purity (HDI Trimer Content)	≥ 90.0 %
Viscosity (at 25°C)	2500 ± 500 mPa·s
Color (Gardner)	≤ 2
Monomer (HDI) Content	≤ 0.5 %
Hydrolyzable Chloride	≤ 50 ppm
Specific Gravity (at 25°C)	1.16 ± 0.02

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