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175617

(3-Mercaptopropyl)trimethoxysilane

Name: (3-Mercaptopropyl)trimethoxysilane
Brand: ALDRICH

95%

Synonym(s):

3-(Trimethoxysilyl)-1-propanethiol

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About This Item

Linear Formula:

HS(CH₂)₃Si(OCH₃)₃

CAS Number:

4420-74-0

Molecular Weight:

196.34

UNSPSC Code:

12352103

NACRES:

NA.23

PubChem Substance ID:

24850516

EC Number:

224-588-5

Beilstein/REAXYS Number:

2038119

MDL number:

MFCD00004901

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Properties

Quality Level

200

assay

95%

form

liquid

refractive index

n20/D 1.444 (lit.)

bp

213-215 °C (lit.)

density

1.057 g/mL at 25 °C (lit.)

storage temp.

2-8°C

SMILES string

CO[Si](CCCS)(OC)OC

InChI

1S/C6H16O3SSi/c1-7-11(8-2,9-3)6-4-5-10/h10H,4-6H2,1-3H3

InChI key

UUEWCQRISZBELL-UHFFFAOYSA-N

Description

General description

This 95% pure organofunctional silane is the industry standard for adhesion promotion. Its bifunctional nature (thiol/trimethoxysilyl) ensures robust chemical bonding at interfaces. The 5% impurity profile typically consists of harmless siloxane oligomers that do not compromise its performance in high-strength bonding or composite manufacturing.

Application

Coupling & Adhesion: Acts as a powerful "molecular bridge" to improve the adhesion between sulfur-vulcanized rubbers or organic polymers and inorganic substrates like silica or glass.
Filler Treatment: Used to treat mineral fillers (like silica) to improve their dispersion and reinforcement within polymer matrices.
Composite Enhancement: Integrated into epoxy or phenolic resins to increase mechanical strength and moisture resistance in industrial composites.