Description

Cyclotetrasiloxane CAS NO 293-51-6 is a volatile cyclic siloxane monomer, a fundamental building block in silicone chemistry. Its high purity and reactivity make it a critical intermediate for synthesizing a wide range of silicone polymers and fluids. This product is essential for manufacturers in the personal care, pharmaceutical, and industrial sectors seeking to produce high-performance materials with specific properties.

Application

• Silicone Polymer Synthesis: A key monomer for the production of polydimethylsiloxanes (PDMS) and other silicone copolymers via ring-opening polymerization.
• Personal Care & Cosmetics: Used as a volatile carrier and emollient in antiperspirants, deodorants, and skin care products, where it provides a smooth, non-greasy feel and evaporates cleanly.
• Pharmaceutical Intermediates: Serves as a precursor in the synthesis of specialized silicone-based excipients and active pharmaceutical ingredients (APIs).
• Industrial Lubricants & Release Agents: A component in formulating high-temperature lubricants, mold release agents, and defoamers.
• Electronics & Electrical: Used in the production of silicone encapsulants, sealants, and potting compounds for electronic components.
• Surface Treatment & Coatings: Acts as a starting material for creating water-repellent coatings and surface modifiers.

Basic Information

Product Name	Cyclotetrasiloxane
CAS No.	293-51-6
Molecular Formula	C8H24O4Si4
Molecular Weight	296.62 g/mol
Synonyms	Octamethylcyclotetrasiloxane; D4; Cyclotetrasiloxane, octamethyl-; OMCTS; Tetramer; Octamethyltetrasiloxane-1,5-diol cyclic; Cyclic dimethylsiloxane tetramer; 2,2,4,4,6,6,8,8-Octamethyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
EINECS	206-039-5

Quality Control

Our Cyclotetrasiloxane is produced under stringent quality management systems. Each batch undergoes rigorous analytical testing, including Gas Chromatography (GC), to ensure high purity and consistency. A comprehensive Certificate of Analysis (COA) detailing purity, identity, and impurity profiles is provided with every shipment to guarantee it meets your specific application requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, well-ventilated area away from heat sources and open flame. Due to its highly volatile nature, ensure containers are kept tightly sealed when not in use to prevent evaporation and maintain product integrity. Recommended storage temperature is 15-25°C.

Specification

Item	Specification
Appearance	Colorless clear liquid
Identification (IR)	Conforms
Assay (GC)	≥ 99.0%
Refractive Index (n20D)	1.396 - 1.398
Density (20°C)	0.955 - 0.958 g/mL
Water Content (KF)	≤ 0.05%

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.