Silicone Products

Updated: 2026-08-20

Overview

Silicone rubber products are manufactured through vulcanization of silicone polymers, resulting in elastomers with exceptional thermal stability and mechanical properties. Unlike organic rubbers, they maintain flexibility across extreme temperatures (-60°C to 250°C) and resist degradation from UV, ozone, and most chemicals. The material's biocompatibility makes it suitable for food-contact and medical applications. These products are typically produced via compression molding, liquid injection molding (LIM), or extrusion processes. Custom formulations allow adjustments in hardness (commonly 20–80 Shore A), color, and additives for specific properties like flame retardancy or enhanced tensile strength.

Structure and Working Principle

Silicone rubber's molecular structure consists of alternating silicon-oxygen bonds with organic side groups, providing both inorganic stability and organic flexibility. This backbone grants low intermolecular forces, enabling the material to compress and rebound efficiently while maintaining shape memory. In functional applications, silicone products leverage viscoelasticity to absorb vibrations and create airtight seals. For example, gaskets utilize compression set resistance to maintain sealing force over time, while medical tubing relies on smooth surface properties to prevent bacterial adhesion.

Key Features

Temperature resistance is unparalleled among elastomers, with continuous service up to 250°C and intermittent exposure to 300°C possible. Silicone exhibits minimal property changes across this range, unlike organic rubbers that harden or degrade. Other critical features include excellent dielectric strength (15–25 kV/mm), making it ideal for electrical insulation. The material's low surface energy provides natural release properties for molding applications, while its gas permeability allows specialized uses in respiratory devices.

Application Areas

Automotive: Turbocharger hoses, spark plug boots, and EV battery seals withstand under-hood temperatures. Medical: Implants, syringe pistons, and respiratory masks benefit from biocompatibility (ISO 10993 certified grades available). Consumer electronics: Keypads and waterproof seals combine tactile feedback with environmental protection. Industrial: High-voltage insulator coatings and conveyor belts utilize electrical and thermal properties. Food service: Baking mats and seals meet FDA 21 CFR 177.2600 standards.

Maintenance and Precautions

While silicone requires minimal maintenance, prolonged exposure to steam above 120°C or sharp objects may reduce service life. Clean with mild soap; avoid petroleum-based solvents that can cause swelling. Storage in dark, ventilated areas prevents surface tackiness from ozone depletion. For industrial applications, regular inspection for compression set (per ASTM D395) ensures seal integrity. Medical-grade products should undergo periodic sterility validation if reused. Note that silicone is not inherently flame-retardant without additives.

B2B Procurement Guide

Specify requirements for: 1) Hardness (Shore A), 2) Operating temperature range, 3) Regulatory certifications (FDA, USP Class VI, UL), and 4) Color stability if exposed to UV. Request material datasheets with ASTM/ISO test results for tensile strength (typically 4–12 MPa) and elongation (100–800%). For custom parts, provide CAD drawings with tolerances (±0.1–0.5mm typical). MOQs vary: 500–5,000 units for molded parts; 100+ meters for extruded profiles. Lead times range 2–8 weeks depending on tooling requirements. Consider Chinese manufacturers for cost-sensitive projects, but verify RoHS/REACH compliance.