Octamethylcyclotetrasiloxane, 98%

Name: Octamethylcyclotetrasiloxane, 98%
Brand: Vaqora Chemicals
SKU: VQ-011135

About Octamethylcyclotetrasiloxane, 98%

Listed under CAS 556-67-2, Octamethylcyclotetrasiloxane is an organosilicon compound available from Vaqora Chemicals at a purity of ≥98%. With the molecular formula C8H24O4Si4, it has a molar mass of 296.61 g/mol. Systematically, it is named 2,2,4,4,6,6,8,8-octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane. Alternative names: Octamethyltetrasiloxane and Cyclotetrasiloxane, octamethyl-.

The material typically appears as a clear colourless liquid. Key physical data: a melting point of 18 °C. Store in a cool, well-ventilated place, away from sources of ignition, with the container tightly sealed. Under GHS it is labelled “Warning”, so handle it with suitable PPE and consult the SDS.

Key uses span cosmetics and personal care and rubber compounding. Our customers for this product work in pharmaceutical manufacturing, academic and industrial research and cosmetics and personal care.

Standard pack sizes are 25 mL, 100 mL and 500 mL, and every batch ships with a Certificate of Analysis (COA) and we export worldwide.

Typical applications

Cosmetics & personal care
Rubber compounding

Industries

Specifications & identifiers

Chemical identifiers
Product name	Octamethylcyclotetrasiloxane, 98%
Catalogue No.	VQ-011135
CAS Number	556-67-2
IUPAC name	2,2,4,4,6,6,8,8-octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
Molecular formula	C₈H₂₄O₄Si₄
Molecular weight	296.61 g/mol
Exact mass	296.0752
Purity / assay	≥98%
HSN code	29420090
InChIKey	HMMGMWAXVFQUOA-UHFFFAOYSA-N
SMILES	C[Si]1(O[Si](O[Si](O[Si](O1)(C)C)(C)C)(C)C)C
PubChem CID	11169

Physical properties
Physical form	Liquid
Appearance	Clear colourless liquid
Melting point	18 °C
H-bond donors / acceptors	0 / 4
TPSA	36.9 Å²
Synonyms	Octamethyltetrasiloxane, Cyclotetrasiloxane, octamethyl-, Cyclic dimethylsiloxane tetramer, Cyclomethicone 4, NUC silicone VS 7207, Union carbide 7207, Silicone SF 1173, KF 994, Dimethylsiloxane Cyclic Tetramer, 2,2,4,4,6,6,8,8-octamethyl-1,3,5,7,2,4,6,8-tetroxatetrasilocane, octamethyl-cyclotetrasiloxane, Octamethylcyclotetrasiloxane, 98%

Safety & hazard information (GHS)

Health hazard

Environmental hazard

Signal word: Warning

Hazard statements

H410Very toxic to aquatic life with long lasting effects

Precautionary statements: P203, P273, P280, P318, P391, P405, P501

Classification is indicative (aggregated GHS notifications) and may vary by grade and concentration. Always refer to the SDS supplied with your lot.

Documents

Safety Data Sheet (SDS)16-section GHS · on request Certificate of AnalysisTypical / batch COA · on request Specification sheetTDS / MOA · on request

Frequently asked questions

What is the CAS number of Octamethylcyclotetrasiloxane, 98%?

The CAS Registry Number of Octamethylcyclotetrasiloxane, 98% is 556-67-2. It is also known as Octamethyltetrasiloxane, Cyclotetrasiloxane, octamethyl-, Cyclic dimethylsiloxane tetramer.

What is the molecular formula and molecular weight of Octamethylcyclotetrasiloxane, 98%?

Octamethylcyclotetrasiloxane, 98% has the molecular formula C8H24O4Si4 and a molecular weight of 296.61 g/mol. Its IUPAC name is 2,2,4,4,6,6,8,8-octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane.

Which grade and pack sizes of Octamethylcyclotetrasiloxane, 98% can I order?

We supply Octamethylcyclotetrasiloxane, 98% in (≥98%) grade, in 25 mL, 100 mL, 500 mL packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Octamethylcyclotetrasiloxane, 98%?

Yes. Every lot of Octamethylcyclotetrasiloxane, 98% is shipped with a batch-specific Certificate of Analysis, and a 16-section GHS Safety Data Sheet is provided with the quotation and the shipment.

Can Octamethylcyclotetrasiloxane, 98% be shipped internationally?

Yes. Octamethylcyclotetrasiloxane, 98% is classified as hazardous, so it is packed in UN-approved packaging and shipped as dangerous goods under IATA/IMDG rules. We export worldwide on EXW, FOB, CIF and DAP terms.