Octamethyltrisiloxane

Agent Name
Octamethyltrisiloxane
CAS Number
107-51-7
Formula
C8-H24-O2-Si3
Major Category
Metals
Octamethyltrisiloxane formula graphical representation
Synonyms
Trisiloxane, 1,1,1,3,3,5,5,5-octamethyl-; Trisiloxane, octamethyl-; [ChemIDplus] 1,1,1,3,3,5,5,5-Octamethyltrisiloxane; [Merck Index] MDM; Dimethylbis(trimethylsiloxy)silane; Pentamethyl(trimethylsiloxy)disiloxane; Pentamethyl(trimethylsilyloxy)disiloxane; L3; Trisiloxan; [Government of Canada - Chemicals Management Plan] UN1993
Category
Metalloid Compounds (Silicon)
Description
Liquid; [Merck Index] Colorless odorless liquid; [Acros Organics MSDS]
Sources/Uses
Used as a base for extreme temperature silicone oils/fluids and as a foam suppressant in petroleum lubricating oils; [Merck Index] Used mainly to make polydimethylsiloxane (PDMS) polymers, oligomers, and mixtures; Also used to make basic chemicals, paints, coatings, adhesives, soaps, cleaning compounds, toiletries, plastics, semiconductors, and other electronic components, and in building construction, lubricants, diluents, solvents, and cosmetics; [Government of Canada - Chemicals Management Plan]
Comments
Causes histopathological liver changes at 1,000 mg/kg/day in 28-day oral study of rats; [EPA - TSCATS] No evidence of skin sensitization in human patch test studies; [ToxPlanet: Government of Canada - Chemicals Management Plan] May cause temporary redness and discomfort on eye contact; May cause CNS depression; [Acros Organics MSDS] See "Tetrakis(trimethylsiloxy)silane." See "Dimethoxydimethylsilane."
Biomedical References

Exposure Assessment

Vapor Pressure
3.34 mm Hg
Explanatory Notes
The Guide in the Emergency Response Guidebook is for "Flammable liquid, n.o.s."

Adverse Effects

Hepatotoxin
Hepatoxic (a) from occupational exposure (secondary effect) or (b) in animal studies or in humans after ingestion

Diseases, Processes, and Activities Linked to This Agent

Processes

Industrial Processes with risk of exposure: