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Chemical Sampling Information (CSI) Chemical Sampling Information
Methyl silicate
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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 (RTECS) Identification Number: VV9800000

    Department of Transportation Regulation Number (49 CFR 172.101) and Guide: 2606 155 [27 KB, PDF]

    NIOSH Pocket Guide to Chemical Hazards, Methyl silicate: chemical description, physical properties, potentially hazardous incompatibilities, and more
Exposure Limits
    OSHA Permissible Exposure Limit (PEL) for Construction Industry: 29 CFR 1926.55 Appendix A -- 5 ppm, 30 mg/m3 Ceiling

    OSHA Permissible Exposure Limit (PEL) for 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
    Laboratory Sampling/Analytical Method:

    • 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 SLTC 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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