Name: Evonik Dynasylan HMDS Hexamethyldisilazane
Brand: Guangzhou Eric Wei Chemical Co., Ltd.

Features Of Evonik Dynasylan HMDS Hexamethyldisilazane

Highly effective silylating agent for surface hydrophobization and moisture protection.
Reacts rapidly under mild conditions with hydroxyl groups on inorganic surfaces (e.g., silica, glass, metals).
Generates volatile by-products (ammonia and hexamethyldisiloxane), enabling clean, residue-free modification.
Low toxicity profile compared to chlorosilanes; suitable for industrial processes requiring improved handling safety.
Excellent solubility in common organic solvents (e.g., toluene, xylene, acetone) facilitating formulation flexibility.

Typical Applications Of Evonik Dynasylan HMDS Hexamethyldisilazane

Surface treatment of fumed and precipitated silica for use in silicone rubber and RTV sealants.
Hydrophobization of fillers in high-performance composites and battery electrode materials.
Passivation layer formation on silicon wafers and MEMS devices in semiconductor manufacturing.
Moisture barrier enhancement in pharmaceutical excipients and lyophilized formulations.
Pre-treatment of glass and ceramic substrates prior to coating or bonding operations.

Chemical Type	Aminosilane derivative / Silylating agent
Product Form	Liquid
Appearance	Colorless to pale yellow clear liquid
Molecular Formula	C₆H₁₉NSi₂
Boiling Point (at 760 hPa)	125–126 °C
Density (at 20 °C)	0.77 g/cm³
Refractive Index (at 20 °C)	1.398–1.402
Storage Stability	Stable under dry, inert conditions; protect from moisture and strong oxidizers

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