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Chemical Sampling Information (CSI)
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General Description

Synonyms: Ethyl silicate, condensed; Tetraethyl silicate; Ethyl orthosilicate; Tetraethoxysilane

OSHA IMIS Code Number: 1230

Chemical Abstracts Service (CAS) Registry Number: 78-10-4

NIOSH Registry of Toxic Effects of Chemical Substances (RTECS) Identification Number: VV9450000; 77741

Department of Transportation Regulation Number (49 CFR 172.101) and Guide: UN1292 129 Flammable Liquid

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

Chemical Description and Physical Properties:

colorless liquid with a mild, sweet, alcohol-like odor
molecular weight: 208
vapor pressure: 2 mm
boiling point: 336°F
melting point: -121°F

Incompatibilities: Strong oxidizers, water

Exposure Limits

OSHA Permissible Exposure Limit (PEL):

General Industry: 100 ppm, 850 mg/m3

Construction Industry: 100 ppm, 850 mg/m3 TWA

American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV): 10 ppm, 85 mg/m3 TWA

National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL): 10 ppm TWA

Health Factors

Potential Symptoms: Eye, nose irritation; In animals: lacrimation; dyspnea, pulmonary edema; tremors, narcosis; anemia; liver, kidney damage

Health Effects: Cumulative kidney, liver and lung damage (HE3) Irritation-Eye, Nose, Throat, Skin---Mild (HE16)

Affected Organs: Respiratory system, liver, kidneys, blood, skin

Monitoring Methods used by OSHA

Primary Laboratory Sampling/Analytical Method (SLC1):

  • sampling media: XAD-2 Tube (100/50 mg sections, 20/50 mesh)
    analytical solvent: Carbon Disulfide
    maximum volume: 9 Liters
    maximum flow rate: 0.05 L/min
    current analytical method: Gas Chromatography; GC/FID
    method reference: 1 (NIOSH S-264)
    sampling analytical error: 0.09
    method classification: Fully Validated

Secondary Laboratory Sampling/Analytical Method (SAM2):

  • device: Instrumentation
    company: Infrared Spectrophotometer
    part #: MIRAN 1A & 1B
    range: 0.04 ppm @ 9.1 um
    class: Mfg

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