Chemical Sampling Information
	Methyl silicate
Quick Links General Description Exposure Limits Health Factors Monitoring Search    [use word(s)/phrase] Table of Contents By Name A B C D E F G H I J K L M N O P Q R S T U V W X Y Z By CAS Number 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. All Trademarks are the property of their respective owners. Accessibility Assistance: Contact the OSHA Directorate of Science, Technology and Medicine at 202-693-2300 for assistance accessing PDF materials.