-120°C to 450°C Extreme Temperature Range: Wide-Temperature Ethyl Silicone Rubber Technology Sets New Material Standards

Since early 2026, the number of silicone-related patents published by China's National Intellectual Property Administration has increased significantly, with innovations related to Ethyl Silicone Rubber and its core raw materials particularly concentrated. Reviewing recent patent literature reveals several core technology directions: extreme environment resistance, low volatility, and high mechanical performance.

Breakthrough 1: Wide-Temperature Silicone Rubber Base Compound

A patent for "Wide-Temperature Silicone Rubber Base Compound for Aerospace Thermal Protection" was published in April 2026, drawing significant attention from both academic and industrial circles. The technology uses ring-opening and condensation copolymerization of three monomers: methylcyclosiloxane, hexaethylcyclotrisiloxane, and phenylenesilicone monomer, successfully introducing both phenylene structures and ethyl side chains into the silicone rubber main chain.

This "ternary copolymerization" design achieves dual breakthroughs:

Phenylene structures: The rigid benzene ring limits the "back-biting" reaction of the silicone elastomer main chain at high temperatures, significantly suppressing the formation of volatile cyclic oligomers. The initial thermal decomposition temperature reaches 450.16°C—approximately 150°C higher than conventional silicone rubber.

Ethyl side chains: The introduction of ethyl groups disrupts molecular chain regularity, lowering the glass transition temperature to -120.2°C with no crystallization across the entire temperature range.

The synergistic effect enables the ethyl silicone rubber base compound to maintain elasticity and stability across an ultra-wide temperature window from -120°C to 450°C—one of the widest operating ranges ever reported in silicone materials.

Breakthrough 2: Low-Temperature Resistant Foam Sealing Material

In April 2026, a patent for "Low-Temperature Resistant Foam Sealing Material Based on Ethyl Silicone Rubber" was published. The formulation includes: Ethyl Silicone Rubber 60-70 parts, foaming agent 4-8 parts, crosslinker 1.5-3 parts, reinforcing filler 14-20 parts, low-temperature additive 8-12 parts, plasticizer 3-6 parts, and weather stabilizer 0.3-1 parts.

Key innovations include:

Ethyl Silicone Rubber matrix: Synergistic use of the ethyl silicone rubber matrix with low-temperature additives and plasticizers improves molecular chain flexibility in extremely cold environments.

Novel weather stabilizer: The new stabilizer continuously inhibits photo-oxidative and thermal-oxidative aging, significantly slowing mechanical property degradation and extending service life in harsh environments.

This technology provides new material solutions for polar equipment, aerospace, and new energy vehicle battery pack sealing applications.

Breakthrough 3: Side-Chain Precision Crosslinking Technology

In the liquid silicone rubber (LSR) field, a patent for "Side-Chain Silicon-Hydrogen Bond Terminal Vinyl Silicone Oil" is noteworthy. The technology introduces side-chain hydrogen-containing silicone oil into linear hydroxy-terminated polydimethylsiloxane under phosphazene catalyst, producing vinyl silicone oil with precisely distributed silicon-hydrogen bonds along the side chains.

This addresses the long-standing "structuring" problem in liquid silicone rubber, where traditional formulations experience increased viscosity and reduced flowability during storage after adding reinforcing fillers.

The technology provides better raw material solutions for high-precision injection-molded LSR products including medical catheters, complex seals, and electronic encapsulation components.