| General Information |
|
| Material Type |
Silicon Rubber |
| Common Applications |
Sealing in electrical components, automotive parts, food processing equipment, medical devices, and general industrial seals. |
| Physical Properties |
|
| Density |
Approximately 1.1 - 1.4 g/cm³ |
| Color |
Usually available in translucent, white, black, and other colors depending on additives. |
| Hardness (Shore A) |
Typically ranges from 20 - 80 Shore A. For example, in some electrical insulation applications, it may be around 40 Shore A, while in more robust mechanical seals, it can be up to 70 Shore A. |
| Tensile Strength |
Can vary from 4 - 12 MPa. For high-quality silicon rubber used in demanding applications, it may reach up to 12 MPa, while in less critical applications, it could be around 4 MPa. |
| Elongation at Break |
Generally between 100% - 600%. In flexible sealing applications, it often has an elongation at break of around 400% to ensure good conformability. |
| Compression Set |
After 22 hours at 150°C and 25% compression, the compression set is usually less than 30%. In some high-performance grades, it can be as low as 10%. |
| Thermal Properties |
|
| Temperature Range |
Operating temperature: -60°C to 200°C. Short-term exposure can withstand up to 250°C. For example, in automotive engine gaskets, it can operate stably within the -40°C to 180°C range. |
| Chemical Resistance |
|
| Compatible Fluids |
Water, most aqueous solutions (non-corrosive), oils (mineral and some synthetic oils like synthetic hydrocarbon oils), and many food-grade substances. For example, it shows good resistance to vegetable oils used in food processing equipment. |
| Incompatible Fluids |
Strong oxidizing agents such as concentrated nitric acid, and some highly reactive organic solvents like aromatic hydrocarbons (benzene, toluene in high concentrations). |
| Electrical Properties |
|
| Dielectric Strength |
Typically around 20 - 30 kV/mm. In electrical insulation applications, it provides reliable insulation with a dielectric strength of about 25 kV/mm. |
| Volume Resistivity |
Greater than \(10^{13}\) Ω·cm, ensuring good electrical insulation properties. In electrical cable seals, this property helps prevent electrical leakage. |
| Sealing Performance |
|
| Sealing Pressure Limit |
In static sealing applications, it can withstand pressures up to 5 bar (72.5 psi) depending on the design and thickness. In dynamic sealing applications, it can handle up to 2 bar (29 psi) under normal operating conditions. |
| Leakage Rate |
For well-designed seals, the leakage rate is extremely low. In a typical fluid sealing scenario, it can be less than 0.01 ml/hour under normal pressure and temperature conditions. |
| Aging Resistance |
|
| Aging Resistance in Air |
After 1000 hours of exposure to air at 150°C, there is minimal change in physical properties. The tensile strength may decrease by no more than 10%, and the hardness may change by no more than 5 Shore A units. |
| Aging Resistance in Oils |
When immersed in mineral oil at 100°C for 500 hours, the volume change is usually within ±10%, and the mechanical properties remain relatively stable. |
| Processing and Fabrication |
|
| Moldability |
Good moldability allows for the production of complex shapes. It can be injection molded, compression molded, or extruded. The minimum wall thickness achievable during molding is about 0.5 mm. |
| Curing Time |
For room temperature vulcanizing (RTV) silicon rubber, it can cure in 24 hours at room temperature. For heat-cured silicon rubber, the curing time at 150°C is around 10 - 20 minutes depending on the thickness of the part. |
| Quality Assurance |
|
| Inspection Standards |
Dimensions are checked within a tolerance of ±0.1 mm for most parts. Physical properties such as hardness, tensile strength, and elongation at break are tested in accordance with relevant international standards (e.g., ASTM D2000 series for automotive applications). |
| Certifications |
Complies with FDA regulations for food contact applications. Also meets ISO 9001 quality management system requirements for manufacturing processes. |
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