Silicone High Temperature Sponge Sheet

Updated: 2026-08-07

Overview

Silicone high-temperature sponge sheets are engineered elastomeric foams combining silicone rubber's thermal stability with a lightweight, compressible sponge structure. Developed for extreme environments, these sheets maintain elasticity across wide temperature ranges where conventional rubbers fail. Manufactured through platinum-catalyzed or peroxide curing processes, the closed-cell structure provides consistent performance in sealing and insulation applications. Unlike organic foams, silicone sponge resists oxidation, weathering, and chemical degradation, making it ideal for long-term outdoor or industrial use.

Physical and Chemical Properties

These sheets exhibit exceptional thermal stability, typically rated for continuous service from -60°C to 230°C, with short-term resistance up to 300°C. The material's compressive strength ranges from 5-50 psi (varies with density), with 90%+ compression recovery after prolonged stress. Chemically inert, silicone sponge resists oils, fuels, acids (except concentrated), and UV radiation. Its flame retardancy often meets UL 94 HF-1 standards. The material's low thermal conductivity (0.15-0.35 W/m·K) and dielectric strength make it effective for electrical insulation.

Main Applications

In automotive and aerospace industries, these sheets serve as exhaust gaskets, engine compartment insulation, and vibration dampers. Their FDA-compliant grades are used in food processing equipment seals. Electronics manufacturers utilize them for thermal management in battery packs and LED lighting. Industrial applications include furnace door seals, expansion joints, and cryogenic insulation. Medical versions with biocompatibility certifications appear in sterilization equipment.

Safety and Storage

While non-toxic per FDA 21 CFR 177.2600, machining operations may generate airborne particulates requiring NIOSH-rated dust masks. Store sheets flat to prevent permanent deformation, ideally at 10-30°C with <70% humidity. Avoid contact with sharp objects during handling. For cleaning, use isopropyl alcohol rather than ketone solvents. Dispose of scraps as non-hazardous waste unless contaminated with other chemicals.

B2B Procurement Guide

Specify required thickness (commonly 1-25mm), density (expressed in kg/m³ or lb/ft³), and color (standard is red/gray). Key performance indicators include compression set (<10% after 22hrs at 150°C) and flame resistance ratings. For thermal applications, request thermal conductivity test reports. Lead times vary from stock availability to 8 weeks for custom formulations. MOQs typically start at 10m², with bulk discounts applicable above 100m². Verify supplier certifications like ISO 9001 and UL listings.