Dimethylsiloxane[2]
Overview
Dimethylsiloxane is a polymer belonging to the siloxane family, characterized by a backbone of alternating silicon and oxygen atoms with methyl groups attached to silicon. Its unique molecular structure imparts exceptional flexibility, thermal stability, and chemical resistance. Industrial production involves the hydrolysis of dimethyldichlorosilane followed by polymerization. The degree of polymerization determines the material's viscosity, ranging from thin fluids to rubber-like solids. This adaptability makes it indispensable across multiple industries.
Physical and Chemical Properties
The compound exhibits remarkable thermal stability, maintaining properties from -40°C to 200°C. Its low surface tension (20.4 mN/m) and high compressibility derive from the flexible Si-O-Si backbone and non-polar methyl groups. Chemically, dimethylsiloxane resists oxidation, UV radiation, and most acids/bases. However, concentrated sulfuric acid and fluoride ions may degrade the polymer. The material's permeability to gases like oxygen is 10× higher than natural rubber, enabling specialized membrane applications.
Main Applications
In industrial settings, dimethylsiloxane serves as a defoamer in petroleum refining and food processing (approved as E900). The electronics industry utilizes its dielectric properties for conformal coatings and thermal interface materials. Medical-grade variants appear in tubing, wound dressings, and prosthetics due to biocompatibility. Consumer products incorporate it in cosmetics (skin feel modifier), cookware (anti-stick coatings), and automotive products (polishes and lubricants).
Safety and Storage
While classified as non-toxic for skin contact, prolonged exposure to high-viscosity fluids may cause temporary eye irritation. Processors should install local exhaust ventilation when heating above 150°C to prevent vapor accumulation. Store in original containers away from oxidizing agents. Steel or polyethylene drums are preferred. Shelf life exceeds 5 years when stored below 30°C with moisture protection. Spills should be contained with inert absorbents.
B2B Procurement Guide
Industrial buyers should specify kinematic viscosity (10–100,000 cSt), purity (industrial/medical grades), and additive packages (e.g., silica-thickened variants). Request certificates of analysis for volatile content and heavy metal residues. Bulk shipments (ISO tanks or 200kg drums) reduce per-unit costs by 20–40%. Establish long-term contracts with producers in China, Germany, or the US to mitigate price volatility from silicone feedstock fluctuations.
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