NIOSH Publication No. 2005-151:

NIOSH Pocket Guide to Chemical Hazards

September 2005

Methyl silicate

CAS
681-84-5

(CH3O)4Si

RTECS
VV9800000
Synonyms & Trade Names

Methyl orthosilicate, Tetramethoxysilane, Tetramethyl ester of silicic acid, Tetramethyl silicate
DOT ID & Guide
2606 / 155

Exposure
Limits

NIOSH REL: TWA 1 ppm (6 mg/m3)
OSHA PEL: none
IDLH
N.D. See: IDLH INDEX
Conversion
1 ppm = 6.23 mg/m3
Physical Description
Clear, colorless liquid. [Note: A solid below 28°F.]
MW: 152.3
BP: 250°F
FRZ: 28°F
Sol: Soluble
VP(77°F): 12 mmHg
IP: ?

Sp.Gr: 1.02
Fl.P: 205°F
UEL: ?
LEL: ?

Class IIIB Combustible Liquid: Fl.P. at or above 200F.
Incompatibilities & Reactivities

Oxidizers; hexafluorides of rhenium, molybdenum & tungsten
Measurement Methods
None available
See: NMAM or OSHA Methods
Personal Protection & Sanitation
(See protection)
Skin: Prevent skin contact
Eyes: Prevent eye contact
Wash skin: Daily
Remove: When wet or contaminated
Change: No recommendation
Provide: Eyewash
First Aid
(See procedures)
Eye: Irrigate immediately
Skin: Soap wash
Breathing: Respiratory support
Swallow: Medical attention immediately
Respirator Recommendations
Not available.
Important additional information about respirator selection
Exposure Routes
inhalation, ingestion, skin and/or eye contact
Symptoms
Irritation eyes, corneal damage (following even short-term exposure to the vapor); lung, kidney injury; pulmonary edema
Target Organs
Eyes, respiratory system, kidneys
See also: INTRODUCTION   See ICSC CARD: 1188