Trimethylsilanol

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ImageFileL1 = Trimethylsilanol.png ImageSizeL1 = 100px
ImageFileR1 = Trimethylsilanol_(structure).png ImageSizeR1 = 160px
IUPACName = Hydroxytrimethylsilane
OtherNames = Trimethylhydroxysilane
Section1 = Chembox Identifiers
CASNo = 1066-40-6
PubChem = 66110
SMILES = C [Si] (C)(C)O
Section2 = Chembox Properties
Formula = C₃H₁₀OSi
MolarMass = 90.196 g/mol
Appearance =
Density =
MeltingPt =
BoilingPt = 98.6 - 99 °C
Solubility =
Section3 = Chembox Hazards
MainHazards =
FlashPt =
Autoignition =

Trimethylsilanol (TMS), also trimethylhydroxysilane, is an organosilicon chemical compound with the formula (CH₃)₃SiOH, or C₃H₁₀OSi. It is an organic derivate of silane substituted with three methyls and one hydroxyl group. It is a volatile organic liquid with boiling point between 98.6-99 °C.

TMS is used to apply hydrophobic coating on silicate surfaces. It reacts with the silicon atoms of the substrate, coating the surface with a layer of methyl groups. A commercial example is Magic Sand.

TMS is a common contaminant in spacecraft atmospheres, where it is present due to outgassing of silicone-based materials. [ [http://books.nap.edu/openbook.php?record_id=9062&page=177 Trimethylsilanol] , Harold L. Kaplan, Martin E. Coleman, and John T. James "Spacecraft Maximum Allowable Concentrations for Selected Airborne Contaminants", Volume 1 (1994)] It is a potential end group hydrolysis product of polydimethylsiloxane chains.

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