Basic information
- Name:
Trimethoxysilylpropanethiol
- CAS No.:
4420-74-0
- Molecular Structure:
- Formula:
- C6H16O3SSi
- Molecular Weight:
- 196.37
- Deleted CAS:
- 89468-78-0|56938-96-6|53241-23-9|383189-28-4|161756-15-6
- Synonyms:
- WD 80;Z 6062;3-mercaptopropyl trimethoxysilane;(3-Thiopropyl)trimethoxysilane;(g-Mercaptopropyl)trimethoxysilane;3-(Sulfanylpropyl)trimethoxysilane;3-(Trimethoxysilyl)-1-propanethiol;3-(Trimethoxysilyl)propanethiol;3-(Trimethoxysilyl)propyl mercaptan;3-MPTMS;3-Mercaptopropyltrimethoxylsilane;A 160 (coupling agent);A 189;AZ 6129;DynasylanMTMO;Dynasylan NTNS;GF 70;KBE 803;KBM 803P;KH 590;LS 1390;M 8500 (coupling agent);MPS-M;MPTMS;MPTS;NUCA 189;Prosil 196;SCA 903;SIM 6476.0;SiSiB PC 2300;Sila-Ace S 810;Silan GF 70;Silquest A 189;TSL 8380E;VP-Si 163;
- EINECS:
- 224-588-5
- Density:
- 0.999 g/cm3
- Melting Point:
- <-50 °C
- Boiling Point:
- 198 °C at 760 mmHg
- Flash Point:
- 48.9 °C
- Solubility:
- decomposes in water
- Appearance:
- white to light straw liquid clear liquid
- Hazard Symbols:
Xn, 
N- Risk Codes:
- 22-43-51/53
- Safety Description:
- 24/25-36/37-61-57 Details
- Transport Information:
- UN 3082 9/PG 3
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Chemistry
IUPAC Name: 3-Trimethoxysilylpropane-1-thiol
Synonyms of Trimethoxysilylpropanethiol (CAS NO.4420-74-0): (3-Mercaptopropyl)trimethoxysilane ; (gamma-mercaptopropyl)trimethoxysilane ; 3-(Trimethoxysilyl)propyl mercaptan ; Silane, 3-mercaptopropyltrimethoxy-
CAS NO: 4420-74-0
Molecular Formula: C6H16O3SSi
Molecular Weight: 196.34
Molecular Structure: 
EINECS: 224-588-5
H bond acceptors: 3
H bond donors: 0
Freely Rotating Bonds: 7
Polar Surface Area: 52.99 Å2
Index of Refraction: 1.439
Molar Refractivity: 51.69 cm3
Molar Volume: 196.4 cm3
Surface Tension: 25.3 dyne/cm
Density: 0.999 g/cm3
Flash Point: 48.9 °C
Enthalpy of Vaporization: 41.64 kJ/mol
Boiling Point: 198 °C at 760 mmHg
Vapour Pressure: 0.518 mmHg at 25°C
Melting Point: <-50°C
Storage temp: 2-8°C
Water Solubility: decomposes
Sensitive: Air & Moisture Sensitive
Stability: Stable, but moisture sensitive - may decomposes on exposure to moist air. Incompatible with water, alcohols, strong oxidizing agents, strong acids.
Appearance: Water white to light straw liquid clear liquid
Product Categories of Trimethoxysilylpropanethiol (CAS NO.4420-74-0): Industrial/Fine Chemicals;Mercapto;Chloroalkylsilanes, etc. (Silane Coupling Agents);Functional Materials;Si (Classes of Silicon Compounds);Silane Coupling Agents;Si-O Compounds;Trialkoxysilanes;Adhesion Promoters;Coupling Agents;Mecapto Silanes;Surface Modifiers
Uses
Trimethoxysilylpropanethiol (CAS NO.4420-74-0) is used in rubber, plastic, glass fibers, coatings, adhesives and sealants products.
Toxicity Data With Reference
| Organism | Test Type | Route | Reported Dose (Normalized Dose) | Effect | Source |
|---|---|---|---|---|---|
| mouse | LD50 | intraperitoneal | 633mg/kg (633mg/kg) | Doklady Akademii Nauk SSSR. Proceedings of the Academy of Sciences of the USSR. For English translation, see DBIOAM and DKBSAS. Vol. 229, Pg. 1011, 1976. | |
| rabbit | LD50 | skin | 2140uL/kg (2.14mL/kg) | Journal of Toxicology, Cutaneous and Ocular Toxicology. Vol. 15, Pg. 261, 1996. | |
| rat | LD50 | oral | 730uL/kg (0.73mL/kg) | Journal of Toxicology, Cutaneous and Ocular Toxicology. Vol. 15, Pg. 261, 1996. |
Consensus Reports
Reported in EPA TSCA Inventory.
Safety Profile
Safety Information about Trimethoxysilylpropanethiol (CAS NO.4420-74-0):
Hazard Codes: 
Xn,
N
Risk Statements: 22-43-51/53
R22: Harmful if swallowed.
R43: May cause sensitization by skin contact.
R51/53: Toxic to aquatic organisms, may cause long-term adverse effects in the aquatic environment.
Safety Statements: 24/25-36/37-61-57
S24/25: Avoid contact with skin and eyes.
S36/37: Wear suitable protective clothing and gloves.
S57: Use appropriate container to avoid environmental contamination.
S61: Avoid release to the environment. Refer to special instructions / safety data sheets.
RIDADR: UN 3082 9/PG 3
WGK Germany: 2
RTECS: TZ7800000
F: 1-10-13
TSCA: Yes
HazardClass: 9
PackingGroup: III
HS Code: 29310095
Moderately toxic by ingestion and intraperitoneal routes. Mildly toxic by skin contact. A skin irritant. When heated to decomposition it emits toxic fumes of SOx. See also MERCAPTANS and SILANE.
Specification
General Information: As in any fire, wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Combustible liquid.
Extinguishing Media: Use water spray, dry chemical, carbon dioxide, or chemical foam.
Handling: Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes. Use only in a chemical fume hood.
Storage: Keep away from heat and flame. Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container..