Octamethylcyclotetrasiloxane, 98%

Description

CAS: 556-67-2 | C8H24O4Si4 | 296.616 g/mol

Octamethylcyclotetrasiloxane is used to prepare silicone oil, silicone rubber and silicone resin having different degrees of polymerization through ring opening and polymerizing. It is also widely used in various fields viz. construction, electronics, textile, automobile, personal care, food, and machining. It is an organometallic reagent utilized for the preparation of siloxane polymers having high surface-hydrophobicity restoration.

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
Octamethylcyclotetrasiloxane is used to prepare silicone oil, silicone rubber and silicone resin having different degrees of polymerization through ring opening and polymerizing. It is also widely used in various fields viz. construction, electronics, textile, automobile, personal care, food, and machining. It is an organometallic reagent utilized for the preparation of siloxane polymers having high surface-hydrophobicity restoration.

Solubility
Immiscible with water.

Notes
Incompatible with strong oxidizing agents, acids and bases.

Specifications

Chemical Identifiers

• CAS: 556-67-2
• Molecular Formula: C8H24O4Si4
• Molecular Weight (g/mol): 296.616
• MDL Number: MFCD00003269
• InChI Key: HMMGMWAXVFQUOA-UHFFFAOYSA-N
• Synonym: octamethylcyclotetrasiloxane, cyclotetrasiloxane, octamethyl, oktamethylcyklotetrasiloxan, cyclic dimethylsiloxane tetramer, omcts, nuc silicone vs 7207, union carbide 7207, silicone sf 1173, oktamethylzyklotetrasiloxan, unii-cz227117je
• PubChem CID: 11169
• ChEBI: CHEBI:25640
• IUPAC Name: 2,2,4,4,6,6,8,8-octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
• SMILES: C[Si]1(O[Si](O[Si](O[Si](O1)(C)C)(C)C)(C)C)C

• Boiling Point: 175°C to 176°C
• Melting Point: 17°C to 18°C
• Quantity: 500 g
• UN Number: UN1993
• Beilstein: 1787074
• Flash Point: 56°C (132°F)
• Merck Index: 14,6747
• Solubility Information: Immiscible with water.
• Formula Weight: 296.62
• Percent Purity: 98%
• Refractive Index: 1.396
• Sensitivity: Moisture sensitive
• Density: 0.956
• Chemical Name or Material: Octamethylcyclotetrasiloxane

Safety and Handling

Hazard Category	H226-H302-H312-H360
Hazard Statement	GHS H Statement H226-H361 Flammable liquid and vapour. Suspected of damaging fertility or the unborn child.
Precautionary Statement	P201-P202-P210-P233-P240-P241-P242-P243-P264b-P270-P281-P301+P312-P303+P361+P353-P308+P313-P312-P330-P363-P370+P378q-P501c
DOTInformation	Transport Hazard Class: 3; Packing Group: III; Proper Shipping Name: FLAMMABLE LIQUIDS, N.O.S.
EINECSNumber	209-136-7
RTECSNumber	GZ4397000
TSCA	Yes
Recommended Storage	Ambient temperatures

SDS

RUO – Research Use Only