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Methyltrimethoxysilane

CAS Number
1185-55-3
EC Number
214-685-0
Chemical Formula
C4H12O3Si
Molecular Weight
136.22 g/mol

Description

Methyltrimethoxysilane ( CAS 1185-55-3 ), commercially known as MTMS, is a reactive organosilane monomer used to modify surfaces, crosslink polymer networks, and improve adhesion between organic and inorganic substrates. It functions as a building block in silicone synthesis and as a coupling agent in composite and coating systems. In coatings and sealants, MTMS acts as a crosslinker and water-repellent surface modifier. This chemical improves durability and adhesion to glass, metal, and mineral substrates. The electronics industry uses it to deposit hydrophobic, dielectric thin films on semiconductor components and circuit boards. In adhesives and elastomers, it contributes to moisture-cure systems and improves the bond strength between polymer matrices and inorganic fillers. This ensures high performance in demanding industrial environments. Personal care formulators incorporate MTMS-derived silicones to achieve water-resistant, smooth-feel finishes in hair and skin products. It is a versatile component for creating high-quality consumer goods. Methyltrimethoxysilane is supplied as a clear, low-viscosity liquid in standard packaging ranging from drums to ISO tank containers for bulk orders. It is available in technical and high-purity grades. Purity levels are typically at 97% or higher depending on application requirements. Buyers in electronics and specialty coatings commonly specify higher-purity lots with controlled moisture content. This ensures consistent reactivity and performance across various manufacturing processes. Our supply chain ensures that all batches meet rigorous industrial specifications for global distribution. Contact us for supply of Methyltrimethoxysilane Request Quote

Other Names (Synonyms)

MTMS | Trimethoxy(methyl)silane | Silane, trimethoxymethyl- | Z 6070 | 0HI0D71MCI | GLASCA B | A 163

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point-78 °C
Boiling Point102-103 °C
Density0.955 g/cm³
Flash Point52 °F
AppearanceColorless clear liquid
Colorcolorless
OdorMild odor
Formliquid
Water Solubilitydecomposes
Vapor Pressure2990 hPa (20 °C)
Refractive Indexn 20/D 1.371(lit.)
Log P-2.4-0.7 at 20℃

Safety & Handling

Danger
GHS02· FlammableGHS07· IrritantGHS05· CorrosiveGHS08· Health Hazard

Hazard Statements

H225Highly Flammable liquid and vapor
H315Causes skin irritation
H317May cause an allergic skin reaction
H318Causes serious eye damage
H319Causes serious eye irritation
H320Causes eye irritation
H332Harmful if inhaled
H335May cause respiratory irritation
H336May cause drowsiness or dizziness
H373May causes damage to organs through prolonged or repeated exposure

Precautionary Statements

P210Keep away from heat, hot surfaces, sparks, open flames and other ignition sources. No smoking.
P233Keep container tightly closed.
P240Ground and bond container and receiving equipment.
P241Use explosion-proof equipment.
P242Use non-sparking tools.
P243Take action to prevent static discharges.
P260Do not breathe dust/fume/gas/mist/vapours/spray.
P261Avoid breathing dust/fume/gas/mist/vapours/spray.
P264Wash … thoroughly after handling.
P271Use only outdoors or in a well-ventilated area.
P272Contaminated work clothing should not be allowed out of the workplace.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P317Get emergency medical help.
P319Get medical advice/attention if you feel unwell.
P321Specific treatment (see … on this label).
P405Store locked up.
P501Dispose of contents/container in accordance with local regulations.
P265Wash … thoroughly after handling.
P352IF ON SKIN: Wash with plenty of water.
P340IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P317Get emergency medical help.
P317Get emergency medical help.
P317If eye irritation persists: Get medical advice/attention. Get emergency medical help.
P364Take off contaminated clothing and wash it before reuse.
P378Use … for extinction.
P233Store in a well-ventilated place. Keep container tightly closed.
P235Store in a well-ventilated place. Keep cool.
P353IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water/shower.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code29310095
UN Number1993
ADR Class3
Packing GroupII
Storage Class3 - Flammable liquids
WGK (Germany)3