Octadecamethylcyclononasiloxane

Name: Octadecamethylcyclononasiloxane
Brand: Vaqora Chemicals
SKU: VQ-032524

About Octadecamethylcyclononasiloxane

Octadecamethylcyclononasiloxane (CAS 556-71-8) is an impurity of Decamethylcyclopentasiloxane offered by Vaqora Chemicals. The compound has the formula C18H54O9Si9, corresponding to a molecular weight of 667.4 g/mol. Alternative names: Cyclononasiloxane, octadecamethyl- and Octadeamethyl-cyclononasiloxane.

The product is provided as a solid. Reference materials should be stored sealed and away from light and moisture, as specified on the accompanying COA. Under GHS it is labelled “Warning”, so handle it with suitable PPE and consult the SDS.

Pharmaceutical QC and development laboratories use this impurity standard of Decamethylcyclopentasiloxane to develop and validate HPLC methods, to set specification limits and to document impurity profiles in ANDA and DMF submissions. Buyers come mainly from pharmaceutical manufacturing and academic and industrial research.

Available in 10 mg, 25 mg, 50 mg and 100 mg packs, Octadecamethylcyclononasiloxane is dispatched with a Certificate of Analysis (COA) to destinations worldwide.

Typical applications

Analytical method development
Method validation (AMV)
QC release testing
ANDA / DMF filings

Industries

Related to Decamethylcyclopentasiloxane

View every impurity, metabolite and intermediate we list for Decamethylcyclopentasiloxane.

Decamethylcyclopentasiloxane impurities

Specifications & identifiers

Chemical identifiers
Product name	Octadecamethylcyclononasiloxane
Catalogue No.	VQ-032524
CAS Number	556-71-8
IUPAC name	2,2,4,4,6,6,8,8,10,10,12,12,14,14,16,16,18,18-octadecamethyl-1,3,5,7,9,11,13,15,17-nonaoxa-2,4,6,8,10,12,14,16,18-nonasilacyclooctadecane
Molecular formula	C₁₈H₅₄O₉Si₉
Molecular weight	667.4 g/mol
Exact mass	666.1691
Grade	Reference Standard
HSN code	38229090
InChIKey	ISXOGOLHEGHGQF-UHFFFAOYSA-N
SMILES	C[Si]1(O[Si](O[Si](O[Si](O[Si](O[Si](O[Si](O[Si](O[Si](O1)(C)C)(C)C)(C)C)(C)C)(C)C)(C)C)(C)C)(C)C)C
PubChem CID	11172

Physical properties
Physical form	Solid
H-bond donors / acceptors	0 / 9
TPSA	83.1 Å²

Safety & hazard information (GHS)

Harmful / irritant

Signal word: Warning

Hazard statements

H319Causes serious eye irritation

Precautionary statements: P264 + P265, P280, P305 + P351 + P338, P337 + P317

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 Octadecamethylcyclononasiloxane?

The CAS Registry Number of Octadecamethylcyclononasiloxane is 556-71-8. It is also known as Cyclononasiloxane, octadecamethyl-, Octadeamethyl-cyclononasiloxane, Octadecamethylnonasiloxane.

What is the molecular formula and molecular weight of Octadecamethylcyclononasiloxane?

Octadecamethylcyclononasiloxane has the molecular formula C18H54O9Si9 and a molecular weight of 667.4 g/mol. Its IUPAC name is 2,2,4,4,6,6,8,8,10,10,12,12,14,14,16,16,18,18-octadecamethyl-1,3,5,7,9,11,13,15,17-nonaoxa-2,4,6,8,10,12,14,16,18-nonasilacyclooctadecane.

What is Octadecamethylcyclononasiloxane used for?

Octadecamethylcyclononasiloxane is supplied as a characterised reference material related to Decamethylcyclopentasiloxane. It is used for analytical method development and validation (AMV), impurity profiling, stability studies and quality control, and in ANDA/DMF regulatory filings.

Which grade and pack sizes of Octadecamethylcyclononasiloxane can I order?

We supply Octadecamethylcyclononasiloxane in Reference Standard grade, in 10 mg, 25 mg, 50 mg, 100 mg packs. Larger bulk quantities and custom packing are quoted on request.

Do you provide a COA and SDS with Octadecamethylcyclononasiloxane?

Yes. Every lot of Octadecamethylcyclononasiloxane 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 Octadecamethylcyclononasiloxane be shipped internationally?

Yes. Octadecamethylcyclononasiloxane 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.