octadecamethyloctasiloxane CAS 556-69-4

Purity >95%In StockPharmaceutical Standards
CAS No.556-69-4
Molecular FormulaC18H54O7Si8
Molecular Weight607.30 g/mol
CategoryPharmaceutical Standards / API Standards
AvailabilityIn Stock

Chemical Structure

octadecamethyloctasiloxane CAS 556-69-4 chemical structure

Description

The occurrence of octadecamethyloctasiloxane is closely related to a carboxylic acid group, a hydroxyl group, an ether linkage in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.

octadecamethyloctasiloxane (CAS 556-69-4) is a high-purity analytical reference standard with the molecular formula C18H54O7Si8 and a molecular weight of 607.30 g/mol.

Based on its molecular formula C18H54O7Si8, octadecamethyloctasiloxane 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 607.30 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry.

This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.

As a certified reference material (CRM), octadecamethyloctasiloxane meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.

Physical & Chemical Properties

Molecular FormulaC18H54O7Si8
Molecular Weight607.30 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

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