Silicone rubber sealing gaskets are high-performance elastic sealing materials made based on organic silicon polymers. With their unique chemical structure and physical properties, they play an irreplaceable role in scenarios with high requirements for high temperature, low temperature, insulation, and hygiene and safety.
1. Core Performance Characteristics
1. Extreme Temperature Adaptability
- High Temperature Resistance: Long-term working temperature range can reach -60℃ to 250℃, and short-term can withstand 300℃ (such as automotive engine sealing). It can be used nearly permanently at 150℃ and for continuous operation at 200℃ for over 10,000 hours.
- Low Temperature Resistance: It remains elastic at -70℃ and is not prone to cracking, suitable for refrigeration equipment and cold-weather machinery.
2. Excellent Sealing and Physical Stability
- Waterproof and Dustproof: The closed-cell structure provides excellent airtightness, low water absorption rate, suitable for battery boxes, outdoor electronic equipment, etc., which need to prevent liquid intrusion.
- High Resilience and Anti-Compression: Resilience rate > 90%, compression permanent deformation rate low (≤ 50% after 48 hours at 200℃), suitable for environments requiring frequent disassembly or vibration (such as battery shock-absorbing pads in new energy vehicles).
- Aging Resistance and Weather Resistance: Resistant to ultraviolet rays, ozone, radiation, with a lifespan of up to 10-15 years in outdoor or harsh climates.
3. Safety and Environmental Friendliness
- Flame Retardant and Fireproof: Some products have passed UL94 V-0 certification (such as battery sealing pads), self-extinguishing when exposed to fire.
- Food-grade and Medical-grade Certification**: Compliant with **FDA, LFGB, ROHS** standards, non-toxic and odorless, suitable for medical devices, food processing equipment sealing (such as water dispenser pipelines, medicine bottle stoppers).
4. Electrochemical Properties
- High Insulation: Dielectric strength 20-25 kV/mm, resistant to electric arcs and corona, good insulation stability in humid environments, suitable for high-voltage cable joints, electronic component sealing.
- Resistance to Chemical Corrosion: Good tolerance to weak acids, weak bases, alcohol, but cautious use in strong solvents, concentrated oils, and strong alkali environments (such as sodium hydroxide).
5. Mechanical Processing Characteristics
- Density range 0.25-0.85 g/cm³, Shore hardness 8-80 HA, can be die-cut and stamped into complex shapes (such as E-type, O-type, irregular strips).
- Optional back adhesive design (pressure-sensitive adhesive), supports quick adhesion to metal, plastic, glass, etc. surfaces.