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Chemical Sampling Information (CSI)
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General Description

Synonyms: Methyl orthosilicate; Tetramethoxysilane; Tetramethyl ester of silicic acid; Tetramethyl silicate

OSHA IMIS Code Number: 1777

Chemical Abstracts Service (CAS) Registry Number: 681-84-5

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: VV9800000

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: 2606 155

NIOSH Pocket Guide to Chemical Hazards, Methyl silicate: chemical description, physical properties, potentially hazardous incompatibilities, and more

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

Construction Industry: 29 CFR 1926.55 Appendix A -- 5 ppm, 30 mg/m3 Ceiling

Maritime: 29 CFR 1915.1000 Table Z-Shipyards -- 5 ppm, 30 mg/m3 TWA

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 1 ppm, 6 mg/m3 TWA

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 1 ppm, 6 mg/m3 TWA

Health Factors

Potential Symptoms: Irritation eyes, corneal damage (following even short-term exposure to the vapor); lung, kidney injury; pulmonary edema

Health Effects: Severe eye damage (HE4); Kidney damage (HE3) Irritation-Eye, Nose, Throat, Skin---Marked (HE14)

Affected Organs: Eyes, respiratory system, kidneys

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • sampling media: XAD-2 Tube (80/40 mg sections, 20/50 mesh)
    analytical solvent: Carbon Disulfide
    maximum volume: 9 Liters
    maximum flow rate: 0.1 L/min
    current analytical method: Gas Chromatography; GC/FID
    method reference: OSHA (In-House File)
    method classification: Not Validated
    note: Recovery of methyl silicate decreases upon storage even when refrigerated. Sample storage stability is less than 75% after 7 days and does not meet current OSHA analytical methods criteria.

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