Description

3,5-Bis(6-Isocyanatohexyl)-2H-1,3,5-Oxadiazine-2,4,6(3H,5H)-Trione is a specialized aliphatic polyisocyanate crosslinker, known commercially as a blocked isocyanate or a trimer of hexamethylene diisocyanate (HDI). This compound is engineered to provide superior weatherability, chemical resistance, and low yellowing in high-performance polymer systems. It is a critical raw material for formulators in the coatings, adhesives, and elastomers industries seeking durable, light-stable final products.

Application

• High-Performance Coatings: As a crosslinker in automotive clear coats, industrial maintenance paints, and coil coatings where exceptional durability and UV resistance are required.
• Adhesives & Sealants: Used to enhance the strength, flexibility, and chemical resistance of polyurethane-based adhesives for automotive, construction, and aerospace applications.
• Elastomers and Urethane Castings: Serves as a key component in the production of耐磨 elastomers, rollers, gaskets, and other cast polyurethane items.
• Textile and Leather Finishing: Imparts water repellency, abrasion resistance, and a soft hand feel to synthetic leather and technical textiles.
• Ink and Overprint Varnishes: Provides scratch resistance and gloss in packaging and printing applications.
• Composite Materials: Used as a matrix resin or modifier in fiber-reinforced plastics to improve toughness and environmental stability.

Basic Information

Item	Detail
Product Name	3,5-Bis(6-Isocyanatohexyl)-2H-1,3,5-Oxadiazine-2,4,6(3H,5H)-Trione
CAS No.	50639-37-7
Molecular Formula	C21H30N4O6
Molecular Weight	434.49 g/mol
Synonyms	HDI Trimer; Hexamethylene Diisocyanate Trimer; Polyisocyanate based on HDI; 1,6-Diisocyanatohexane trimer; Isocyanurate of HDI; Tolonate HDT; Desmodur N 3300; Bayhydur 302
EINECS	Contact for details

Quality Control

Our production of 3,5-Bis(6-Isocyanatohexyl)-2H-1,3,5-Oxadiazine-2,4,6(3H,5H)-Trione adheres to stringent quality management systems to ensure batch-to-batch consistency and performance reliability. Each lot is analyzed for critical parameters including NCO content, viscosity, color, and monomer content. Certificates of Analysis (COA) are provided with every shipment, detailing the specifications and test results. Our quality protocols are designed to meet the demands of global industrial and specialty chemical applications.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at temperatures between 15-25°C (59-77°F). This product is hygroscopic (moisture-sensitive); containers must be kept sealed under a dry atmosphere (e.g., under dry nitrogen) to prevent reaction with atmospheric moisture, which can cause viscosity increase or gelation.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms
NCO Content	21.0 - 22.0 %
Viscosity (25°C)	2500 - 3500 mPa·s
Color (Gardner)	≤ 2
Monomer (HDI) Content	≤ 0.5 %
Specific Gravity (25°C)	1.16 - 1.18
Flash Point	> 200 °C

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