XDI

XDI (Xylylene Diisocyanate)

Synonyms: m-Xylylene Diisocyanate; 1,3-Bis(isocyanatomethyl)benzene; meta-Xylylene Diisocyanate

Molecular Formula: C₁₀H₈N₂O₂

Molecular Weight: 188.2 g/mol

Description: XDI is a colorless to pale yellow clear liquid diisocyanate with isocyanate groups attached via methylene bridges to an aromatic ring. This structure imparts aliphatic-like properties, including outstanding non-yellowing performance, optical clarity, and weather resistance, making it a premium raw material for high-performance polyurethane materials.

Key Properties:

Appearance: Colorless to pale yellow clear liquid
NCO Content: ≈44.6–44.8%
Purity: ≥99.0% (typical commercial grade)
Viscosity (25°C): ≈3–5 mPa·s
Freezing Point: ≈-7°C
Density (25°C): ≈1.18 g/cm³

Applications: XDI is primarily used to synthesize polyisocyanates or directly in high-refractive-index polyurethane resins for optical applications, as well as in two-component coatings, adhesives, and elastomers. These products offer exceptional non-yellowing, transparency, chemical resistance, and durability, making them ideal for:

Optical lenses (high refractive index eyeglass lenses)
Non-yellowing clear coatings and inks
High-performance adhesives and sealants
Specialty coatings for electronics and automotive
Transparent elastomers and films

Safety Notes:

XDI monomer is highly reactive and toxic. It may cause respiratory sensitization, skin irritation, and eye damage. Strict ventilation, personal protective equipment, and safe handling procedures are required.

XDI

XDI

Safety Notes:

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