CAS Number: 681-84-5
Product Catalog

93-1459

Silicon › Tetramethoxysilane, 98%

Stability: moisture sensitive

Safety: Hazardous

Physical Characteristics: melting point 4-5°C, boiling point 121-122°C, flash point 84°F, density 1.032

Transportation: Boat, truck. See MSDS sheet.

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SECTION 1: Product Identification
Chemical Name:	Tetramethoxysilane, 98%
Product Number:	93-1459
CAS Registry Number:	681-84-5
Formula:	Si(OCH3)4
EINECS Number:	211-656-4
Chemical Family:	organosilicon compounds
Synonym:	Methyl silicate, Tetramethylorthosilicate, silicic acid methyl ester, tetramethylsilicate

SECTION 2: Composition and Information on Ingredients
Ingredient	CAS Number	Percent	ACGIH (TWA)	OSHA (PEL)
Title Compound	681-84-5	100	no data	no data

SECTION 3: Hazards Identification
Emergency Overview:	Volatile liquid. Toxic by inhalation. Harmful if swallowed. Moisture will produce methanol vapor which may cause blindness, intoxication, dizziness, and coma.
Primary Routes of Exposure:	Inhalation, ingestion, contact with skin and eyes.
Eye Contact:	Causes irritation of the eyes. Delayed blindness may occur through atrophy of the optic nerve.
Skin Contact:	Dehydrating agent. Liquid causes mild irritation of the skin.
Inhalation:	Toxic by inhalation. Animal studies have shown inhalation of low concentrations can be toxic to the respiratory system
Ingestion:	Harmful if swallowed. Ingestion may cause nausea, vomiting, headache, coma and death.
Acute Health Effects:	Toxic by inhalation. Harmful if swallowed. Irritating to skin, eyes and respiratory tract. May cause blurred vision, blindness, intoxication, dizziness, headache, nausea, coma and death.
Chronic Health Effects:	Rapid hydrolysis on human contact produces methanol, which is metabolized slowly to formaldehyde. Gradual atrophy of the optic nerve may occur producing blindness.
NTP:	No
IARC:	No
OSHA:	No

SECTION 4: First Aid Measures
Eye Exposure:	Immediately flush the eyes with copious amounts of water for at least 10-15 minutes. A victim may need assistance in keeping their eye lids open. Get immediate medical attention.
Skin Exposure:	Wash the affected area with soap and water. Remove contaminated clothes if necessary. Seek medical assistance if irritation persists.
Inhalation:	Remove the victim to fresh air. Closely monitor the victim for signs of respiratory problems, such as difficulty in breathing, coughing, wheezing, or pain. In such cases seek immediate medical assistance.
Ingestion:	Seek medical attention immediately. Keep the victim calm. Give the victim water (only if conscious).

SECTION 5: Fire Fighting Measures
Flash Point:	84 °F
Autoignition Temperature:	no data
Explosion Limits:	no data
Extinguishing Medium:	carbon dioxide, dry powder or foam
Special Fire Fighting Procedures:	Flammable. If involved in a fire, fire fighters should be equipped with a NIOSH approved positive pressure self-contained breathing apparatus and full protective clothing.
Hazardous Combustion and Decomposion Products:	Vapors highly toxic to eyes and respiratory system. If involved in a fire this material may emit silica dust.
Unusual Fire or Explosion Hazards:	Flammable liquid. Formation of explosive air/ vapor mixtures is possible.

SECTION 6: Accidental Release Measures
Spill and Leak Procedures:	Eliminate all ignition sources. Avoid contact with water. Small spills may be adsorbed into diatomaceous earth, sand, or other suitable adsorbent, and swept up.

SECTION 7: Handling and Storage
Handling and Storage:	Store in a tightly sealed container in a cool dry place. If container is left open, product may adsorb moisture from the atmosphere and release methanol vapor.

SECTION 8: Exposure Controls and Personal Protection
Eye Protection:	Always wear approved safety glasses when handling a chemical substance in the laboratory.
Skin Protection:	Wear protective clothing and gloves.
Ventilation:	Material may form a vapor upon exposure to air. if possible, handle the material in an efficient fume hood.
Respirator:	If ventilation is not available a respirator should be worn. The use of respirators requires a Respirator Protection Program to be in compliance with 29 CFR 1910.134.
Additional Protection:	No additional protection required.

SECTION 9: Physical and Chemical Properties
Color and Form:	colorless liq.
Molecular Weight:	152.2
Melting Point:	3-5°C
Boiling Point:	121-122°C
Vapor Pressure:	no data
Specific Gravity:	1.032
Odor:	alcohol-like odor
Solubility in Water:	reacts with water

SECTION 10: Stability and Reactivity
Stability:	moisture sensitive liquid
Hazardous Polymerization:	no hazardous polymerization
Conditions to Avoid:	Keep away from moisture, heat and ignition sources including open flame and electrostatic discharge.
Incompatibility:	oxidizing agents, halogens, mineral acids and strong bases
Decomposition Products:	Carbon dioxide, carbon monoxide, organic vapors, and metal oxides and carbonates.

SECTION 11: Toxicological Information
RTECS Data:	Oral (rat); LDLo: 700 mg/kg. Inhalation (rat); LCLo: 250 ppm/4H. Intraperitoneal (rat); LD50: 100 mg/kg. Inhalation (mouse); LCLo: 1 gm/m3/10M. Intraperitoneal (mouse); LD50: 250 mg/kg. Administration onto the skin (rbt); 17 mL/kg. Intravenous (rbt); LDLo: 100 mg/kg. Oral (mammal-species unspecified); LD50: 1 gm/kg. Inhalation (rat); TCLo: 30 ppm/6H/28D-I. Inhalation (rat); TCLo: 20 ppm/6H/5D-I.
Carcinogenic Effects:	No data available
Mutagenic Effects:	No data available
Tetratogenic Effects:	No data available

SECTION 12: Ecological Information
Ecological Information:	No information available

SECTION 13: Disposal Considerations
Disposal:	Dispose of according to local, state and federal regulations.

SECTION 14: Transportation
Shipping Name (CFR):	Methyl orthosilicate
Hazard Class (CFR):	6.1 (inhalation hazard)
Additional Hazard Class (CFR):	3
Packaging Group (CFR):	I
UN ID Number (CFR):	UN# 2606
Shipping Name (IATA):	Prohibited
Hazard Class (IATA):	NA
Additional Hazard Class (IATA):	NA
Packaging Group (IATA):	NA
UN ID Number (IATA):	UN# 2606

SECTION 15: Regulatory Information
TSCA:	Listed in the TSCA inventory.
SARA (Title 313):	Title compound not listed.
Second Ingredient:	none
Third Ingredient:	none

SECTION 16: Other Information
Disclaimer:	The information herein is believed to be accurate and reliable as of the date compiled. However, Strem Chemicals, Inc. makes no representation, warranty, or guarantee of any kind with respect to the information contained in this document or any use of the product based on this information.
Preparation Date:	2/26/2001
Revision Date:	12/23/2011