Overview
Silicone rubber material is a synthetic elastomer composed of silicon, oxygen, carbon, and hydrogen. Unlike natural rubber, it maintains flexibility across extreme temperatures while offering superior chemical resistance. Developed in the mid-20th century, it has become indispensable in industries requiring durable, non-reactive materials. The material exists in various forms including solid rubber, sponge, and liquid silicone rubber (LSR) for injection molding. Its molecular structure features a backbone of alternating silicon and oxygen atoms with organic side groups, creating unique viscoelastic properties that distinguish it from organic rubbers.
Physical and Chemical Properties
Silicone rubber exhibits exceptional thermal stability, maintaining elasticity from -60°C to 300°C. This surpasses most organic rubbers which typically become brittle below -40°C or degrade above 150°C. The material's low compression set (5-10%) ensures long-term sealing performance. Chemically, silicone rubber resists oxidation, UV radiation, and many corrosive substances. It shows excellent dielectric properties (volume resistivity >10^15 Ω·cm) and low surface energy that prevents adhesion. Unlike carbon-based polymers, it doesn't support microbial growth, making it ideal for medical applications.
Main Applications
In industrial settings, silicone rubber serves as gaskets and seals in automotive, aerospace, and energy systems where temperature extremes occur. Electronics manufacturers use it for keyboard pads, connector seals, and high-voltage insulation due to its dielectric properties. The medical sector utilizes platinum-cured grades for implants, tubing, and respiratory masks benefiting from biocompatibility and sterilizability. Consumer products range from bakeware to baby bottle nipples, leveraging its food safety and flexibility. Recent developments include transparent grades for optical applications and conductive variants for flexible electronics.
Safety and Storage
Most silicone rubbers are non-toxic and meet FDA 21 CFR 177.2600 for food contact. However, some curing systems (peroxide or platinum-based) require proper ventilation during processing. Uncured material should be stored below 30°C in sealed containers to prevent premature crosslinking. Finished products demonstrate excellent aging resistance but should avoid prolonged contact with strong acids, bases, or solvents like ketones and aromatic hydrocarbons. For medical applications, verify USP Class VI or ISO 10993 compliance. Always consult material safety data sheets for specific formulations.
B2B Procurement Guide
Industrial buyers should specify hardness (typically 20-80 Shore A), tensile strength (4-12 MPa), and elongation (100-1000%). For thermal applications, verify continuous service temperature and compression set data. Medical buyers must require USP Class VI or ISO 10993 certification. Consider processing method: high-consistency rubber (HCR) for compression molding versus LSR for injection molding. Lead times vary from stock items (2-4 weeks) to custom formulations (8-12 weeks). Bulk pricing breaks typically occur at 100kg quantities. Always request certificates of analysis for critical parameters.
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