Octadecamethylnonasiloxane CAS 556-71-8

Purity >95%In StockPharmaceutical Standards
CAS No.556-71-8
Molecular FormulaC18H54O9Si9
Molecular Weight667.39 g/mol
CategoryPharmaceutical Standards / API Standards
AvailabilityIn Stock

Chemical Structure

Octadecamethylnonasiloxane CAS 556-71-8 chemical structure

Description

Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.

CATO supplies Octadecamethylnonasiloxane (CAS 556-71-8), a certified reference material (molecular formula C18H54O9Si9, MW 667.39 g/mol) for analytical method development and quality control.

Based on its molecular formula C18H54O9Si9, Octadecamethylnonasiloxane contains a carboxylic acid group, a hydroxyl group, an ether linkage; these features give the compound characteristic functional-group stretching vibrations in infrared spectroscopy. The molecular weight of 667.39 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry.

The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.

Physical & Chemical Properties

Molecular FormulaC18H54O9Si9
Molecular Weight667.39 g/mol
Purity>95%
StorageStore at room temperature, keep sealed and dry
Solubility (reference)Soluble in methanol, acetonitrile, DMSO, water (slightly soluble)
StabilityStable under recommended storage conditions
Degree of Unsaturation (DBE)-8.0
CAS Registry Year (est.)1957

Recommended Standards

Why CATO?