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Introduction to Silicone Rubber Sheets
Silicone rubber sheets, referred to as silicone sheets, are sheet materials primarily made from silicone rubber through processes such as compounding, calendering, and vulcanization. They combine the unique chemical and physical properties of silicone rubber with the versatility of sheet form, making them an extremely versatile high-performance elastic material. Based on whether they contain reinforcing substrate materials, they can be categorized into pure rubber sheets and silicone-coated fabrics (coated with fiberglass cloth or polyester cloth).
Core Characteristics and Advantages
Silicone sheets inherit almost all the excellent properties of silicone rubber:
Exceptional High and Low-Temperature Resistance
This is its most distinctive feature. The typical operating temperature range for general silicone sheets is -60°C to +200°C. Special formulations (e.g., thickened sheets, with added temperature-resistant fillers) can withstand short-term exposure to +250°C or even higher temperatures, while maintaining good elasticity at low temperatures.
Excellent Weather and Aging Resistance
Highly resistant to ozone, ultraviolet (UV) light, and sunlight exposure. They can be used outdoors for long periods without cracking, becoming tacky, or embrittling like ordinary rubber, resulting in a long service life.
Good Physiological Inertia, Eco-Friendly, and Non-Toxic
Food-grade and medical-grade silicone sheets are non-toxic, odorless, non-corrosive, and comply with certifications like FDA and LFGB, allowing direct contact with food and pharmaceuticals.
Excellent Electrical Insulation Properties
Maintains good insulation even in harsh environments like humidity and high temperatures, making it a reliable insulating material.
Good Flexibility and Resilience
Maintains good elasticity and flexibility across a wide temperature range, suitable for use as cushioning and vibration-damping material.
Chemical Resistance
Resistant to weak acids, alkalis, alcohol, etc., but not resistant to strong acids, strong bases, and solvents (e.g., concentrated sulfuric acid, petroleum ether). Its chemical resistance is inferior to that of fluororubber (FKM).
Main Application Fields
The properties of silicone sheets make them suitable for the following scenarios:
Industrial Sealing & Gaskets:
Used as gasket stock for die-cutting or machining into various shapes of sealing gaskets for equipment, pipelines, and enclosures.
Sealing gaskets for thermal equipment and instruments, leveraging their high-temperature resistance.
Food & Pharmaceutical Industries:
Food conveyor belts, table mats, and gaskets for food processing equipment (requires food-grade silicone sheets).
Sealing and insulating components for pharmaceutical and medical equipment.
Electronics & Electrical Industry:
Insulating gaskets, thermal barriers, and heat dissipation pads (high thermal conductivity type) in electronic products.
High-voltage insulating materials, covering layers for wires and cables.
Home & Daily Use:
Kitchenware mats (e.g., steamer liners, baking pan liners), placemats, coasters.
Surface material for yoga mats, massage equipment (food-grade or medical-grade is safer).
Other Special Applications:
High-transparency Silicone Sheets: For viewports, gaskets requiring visibility.
High-hardness Silicone Sheets: For support and cushioning components.
Flame-retardant Silicone Sheets: For applications requiring fire resistance, such as in power, rail transit.
Thermally Conductive Silicone Sheets: For heat dissipation and conduction in electronic components.
Silicone-Coated Fabrics: For flexible connections, fire curtains, and expansion joints in high-temperature environments.
Common Types and Specifications
For a clearer understanding of its types, please refer to the following table:
Common Types and Characteristics of Silicone Sheets
| Type | Main Characteristics | Common Applications |
|---|---|---|
| General-Purpose Silicone Sheet | Balanced overall performance, cost-effective | General sealing, gaskets, insulation |
| Food-Grade Silicone Sheet | Non-toxic, odorless, complies with food safety standards | Food processing equipment, kitchenware, placemats |
| Medical-Grade Silicone Sheet | Ultra-high purity, good biocompatibility | Medical devices, pharmaceutical machinery |
| Fumed Silica Sheet | Made from fumed silica silicone, extremely high purity, high transparency, better mechanical properties | High-demand sealing, medical use, high-end insulation |
| Flame-Retardant Silicone Sheet | Self-extinguishing, meets flame-retardant ratings like UL94 V-0 | Power equipment, aerospace, rail transit |
| Thermally Conductive Silicone Sheet | Contains thermally conductive fillers (e.g., alumina, boron nitride), provides thermal conduction and insulation | LED lighting, power supplies, CPU heat dissipation |
| Silicone Fiberglass Cloth | Silicone-coated fiberglass cloth, high strength, high-temperature resistant, flexible | High-temperature flexible connections, fire blankets, welding protection |
Typical Performance Parameters for Silicone Sheets (General-Purpose Type as Example)
| Characteristic | Test Standard | Unit | Typical Value Range | Remarks |
|---|---|---|---|---|
| Hardness | ASTM D2240 | Shore A | 20 - 80 | Common range: 50°A ~ 70°A |
| Tensile Strength | ASTM D412 | MPa | 5 - 10 | Mechanical strength is a key weakness |
| Tear Strength | ASTM D624 | kN/m | 10 - 30 | |
| Elongation at Break | ASTM D412 | % | 200 - 600 | Good elasticity |
| Operating Temperature | - | °C | -60 to +200 (up to 250 short-term) | Core Advantage |
| Volume Resistivity | ASTM D257 | Ω·cm | 10¹³ - 10¹⁵ | Excellent electrical insulator |
| UV/Ozone Resistance | - | - | Excellent | No aging with long-term outdoor use |
| Common Thickness | - | mm | 0.5 - 50 | Customizable |
| Common Colors | - | - | Red, White, Gray, Black, Transparent |
Summary
Silicone sheets are a fundamental industrial material that presents the exceptional temperature resistance, weather resistance, and safe, non-toxic properties of silicone rubber in sheet form.
Their value lies in their versatility:
As a Sealing Material: Can be processed into various gaskets to solve sealing problems in high-temperature environments.
As an Insulating Material: Provides reliable electrical insulation protection.
As a Safety Material: Food-grade and medical-grade properties allow safe contact with the human body and food.
As Stock Material: Serves as the base material for further processing into complex parts.
Key Selection Considerations:
Environmental Temperature? → Leverage its high/low-temperature resistance.
Food/Medical Requirements? → Choose food-grade or medical-grade.
Insulation or Thermal Conduction Needed? → Choose general insulating type or special thermally conductive type.
Need Higher Strength and Flex Resistance? → Consider silicone-coated fabrics.
It is a reliable choice for engineers and designers when solving problems related to high temperatures, insulation, and safe sealing.
