Octamethyltrisiloxane

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

3.34 mm Hg

Explanatory Notes

The Guide in the Emergency Response Guidebook is for "Flammable liquid, n.o.s."

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

Processes

Industrial Processes with risk of exposure:

• Semiconductor Manufacturing