Pentamethyldisiloxane, 95%

Catalog No.	Quantity
AAL1657706	5 g
AAL1657714	25 g

Catalog No. AAL1657706 Supplier Thermo Scientific Chemicals Supplier No. L1657706

Description

CAS: 1438-82-0 | C5H15OSi2 | 147.344 g/mol

Pentamethyldisiloxane is used in the synthesis of siloxane-polyether copolymer surfactants. It is also used as source of trimethylsilyl functional group in organic synthesis.

This Thermo Scientific Chemicals brand product was originally part of the Alfa Aesar product portfolio. Some documentation and label information may refer to the legacy brand. The original Alfa Aesar product / item code or SKU reference has not changed as a part of the brand transition to Thermo Scientific Chemicals.

Applications
Pentamethyldisiloxane is used in the synthesis of siloxane-polyether copolymer surfactants. It is also used as source of trimethylsilyl functional group in organic synthesis.

Solubility
Not miscible or difficult to mix in water.

Notes
It is sensitive to moisture. Keep container tightly closed in a dry and well-ventilated place. Store under dry inert gas. Incompatible with oxidizing agents.

Specifications

Chemical Identifiers

• CAS: 1438-82-0
• Molecular Formula: C5H15OSi2
• Molecular Weight (g/mol): 147.344
• MDL Number: MFCD00053658
• InChI Key: XUKFPAQLGOOCNJ-UHFFFAOYSA-N
• Synonym: pentamethyldisiloxane, disiloxane, pentamethyl, 1,1,1,3,3-pentamethyldisiloxane, dimethyl trimethylsilyloxy silicon, disiloxane, 1,1,1,3,3-pentamethyl, dimethyl trimethylsilyl oxy silyl, dimethylsilyl oxy trimethylsilane
• PubChem CID: 6327260
• IUPAC Name: dimethyl(trimethylsilyloxy)silicon
• SMILES: C[Si](C)O[Si](C)(C)C

• Boiling Point: 86°C to 87°C
• Quantity: 5 g
• UN Number: UN1993
• Beilstein: 1734568
• Flash Point: −19°C (−2°F)
• Solubility Information: Not miscible or difficult to mix in water.
• Formula Weight: 148.35
• Percent Purity: 95%
• Refractive Index: 1.374
• Sensitivity: Moisture sensitive
• Density: 0.758
• Chemical Name or Material: Pentamethyldisiloxane

Safety and Handling

Hazard Category	H225
Hazard Statement	GHS H Statement H225 Highly flammable liquid and vapor.
Precautionary Statement	P210-P233-P240-P241-P242-P243-P280-P303+P361+P353-P370+P378q-P501c
DOTInformation	Transport Hazard Class: 3; Packing Group: II; Proper Shipping Name: FLAMMABLE LIQUIDS, N.O.S.
EINECSNumber	215-873-5
TSCA	Yes
Recommended Storage	Ambient temperatures

SDS

RUO – Research Use Only