Overview
Silicone rubber sheets are synthetic elastomers made from silicone polymers reinforced with silica. Unlike natural rubber, they maintain elasticity across extreme temperatures (-60°C to 230°C) and resist UV, ozone, and chemical degradation. First developed in the 1940s, modern silicone sheets are manufactured through compression molding or calendering processes. They are available in various hardness levels (typically 20–80 Shore A) and thicknesses (0.5mm–10mm), with optional fabric or adhesive backing for specialized applications.
Physical and Chemical Properties
Silicone sheets exhibit low compression set (≤10%), meaning they retain shape after prolonged pressure. Their dielectric strength (15–20 kV/mm) makes them ideal for electrical insulation. The material’s thermal conductivity ranges from 0.15–0.3 W/mK, with some thermally conductive formulations reaching 1.5 W/mK. Chemically, silicone resists water, alcohols, and weak acids but may swell in ketones or hydrocarbons. Food-grade versions comply with FDA 21 CFR 177.2600, while medical-grade sheets meet ISO 10993 biocompatibility standards. Flame-resistant variants achieve UL 94 V-0 ratings.
Main Applications
In automotive industries, silicone sheets serve as engine gaskets and vibration dampers due to their high-temperature stability. Electronics manufacturers use them as thermal interface materials (TIMs) between heat sinks and chips, with 0.5–2mm thicknesses being most common. The medical sector employs platinum-cured silicone sheets for implantable devices and sterilization-compatible seals. Other uses include industrial conveyor belts, baking mats, and waterproof seals in construction. Custom die-cut parts account for 60% of B2B orders.
Safety and Storage
While silicone itself is non-toxic, some industrial-grade sheets may contain peroxide curing agents that require proper ventilation during cutting or vulcanization. Always verify material safety data sheets (MSDS) for specific formulations. Store sheets flat or rolled (never folded) in original packaging away from direct sunlight. Shelf life typically exceeds 5 years. For cleanroom applications, opt for vacuum-sealed, particle-controlled packaging to prevent contamination.
B2B Procurement Guide
Key specifications to confirm include: hardness (Shore A), tensile strength (4–10 MPa typical), elongation at break (300–600%), and tear resistance (10–30 kN/m). For thermal applications, request thermal impedance test reports. Lead times vary from 1–4 weeks for standard sheets, while custom formulations may require 6–8 weeks. MOQs commonly start at 10m² for standard grades. Always request material certification and batch testing reports, especially for medical or food-contact applications.
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