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1,3-Diphenyltetramethyldisiloxane
Also known as: 1,1,3,3-Tetramethyl-1,3-diphenyldisiloxane · 1,3-Diphenyltetramethyldisiloxane · 1,3-Diphenyl-1,1,3,3-tetramethyldisiloxane · Disiloxane, 1,1,3,3-tetramethyl-1,3-diphenyl-
- CAS No.
- 56-33-7
- Formula
- C16H22OSi2
- Molar mass
- 286.51 g/mol
- PubChem CID
- 5945
Harmful / Irritant
Summary
1,3-Diphenyltetramethyldisiloxane (C16H22OSi2), CAS 56-33-7. Common in labs and industry. Read on for hazards, storage, PPE and mixing rules.
Background
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Hazards
May cause skin, eye or respiratory irritation.
Hazard statements
- H315
- H319
- H335
Storage
Keep at room temperature, below 30 °C, out of direct heat.
Store somewhere well-ventilated and away from any ignition source.
Metal drums or tinted glass, tightly sealed.
Strong acids, strong bases and powerful oxidizers.
Personal protective equipment
Nitrile or butyl, at least 0.4 mm thick.
Safety goggles with side shields.
A2 organic-vapor cartridge if the room isn't well ventilated.
Occupational exposure limits (HSE)
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EU harmonised classification (ECHA C&L)
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Transport
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FDA recalls & enforcement
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Compatibilities
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Open comparator with 1,3-DiphenyltetramethyldisiloxanePractical safety notes
- Irritant / harmful. Ventilate the workspace and avoid skin contact.
Derived from the GHS classification shown above. These notes are generic guidance and do not replace the manufacturer's SDS or your local risk assessment.
FAQ
Is 1,3-Diphenyltetramethyldisiloxane flammable?+
1,3-Diphenyltetramethyldisiloxane (CAS 56-33-7) does not carry the GHS02 flame pictogram in our records. Always confirm with the manufacturer's SDS section 9 (flash point) before assuming a product is non-flammable.
What PPE should I wear when handling 1,3-Diphenyltetramethyldisiloxane?+
Safety glasses with side shields and nitrile gloves are the baseline. Ventilation should be sufficient to keep vapours below the occupational exposure limit. Check SDS section 8 for material-specific breakthrough times.
How should 1,3-Diphenyltetramethyldisiloxane be stored?+
Store 1,3-Diphenyltetramethyldisiloxane (CAS 56-33-7) in tightly closed original containers, in a cool, dry, well-ventilated area away from incompatible materials.
Is 1,3-Diphenyltetramethyldisiloxane dangerous for the environment?+
No specific environmental pictogram (GHS09) is listed in our records for 1,3-Diphenyltetramethyldisiloxane, but any chemical waste should be handled through your site's hazardous-waste procedure, not poured down the drain.
Where can I find the official Safety Data Sheet for 1,3-Diphenyltetramethyldisiloxane?+
Official, up-to-date SDS documents are published by each manufacturer (Sigma-Aldrich, Merck, Thermo Fisher, VWR, Carl Roth, etc.) and by regulators such as ECHA and NIOSH. This page is an educational summary and does not replace the manufacturer's SDS.
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