Pressure-Sensitive Gasket is a special type of sealing material designed with a unique structure. It is typically made of elastic materials such as rubber, silicone, or polyurethane, or composite materials. The characteristic of pressure sensitivity allows it to achieve sealing, cushioning, or conductive functions under specific pressures. Here are some basic guidelines and precautions for using pressure-sensitive gaskets:
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### **1. The main application scenarios of pressure-sensitive pads**
1. **Sealing Function**: Used at joints such as pipes, flanges, and valves, to prevent the leakage of liquids or gases.
2. **Buffer and shock absorption**: Absorbs vibration or impact in mechanical assembly.
3. **Conductive/Insulating**: Used in electronic devices for electromagnetic shielding (conductive pads) or circuit insulation.
4. **Medical Equipment**: Such as respiratory masks and the sealing buffer of medical instruments.
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### **Steps for Use**
1. Surface cleaning
- Ensure that the installation surface is clean, free of oil, dust, or residue, as these can affect the sealing effect.
- Wipe the surface with a solvent (such as isopropyl alcohol), dry it, and then install it.
2. **Choose the Right Gasket**
- Select materials based on the working environment (temperature, pressure, medium type) (e.g., high-temperature resistant silicone, oil-resistant nitrile rubber, etc.).
Confirm that the gasket's dimensions (thickness, inner diameter/outer diameter) match the installation location.
3. Install the gasket
- Place the gasket flat on the sealing surface to avoid twisting or folding.
- For pressure-sensitive pads with adhesive backing, peel off the protective film and directly adhere to a clean surface.
- For non-adhesive gaskets, uniform pressure must be applied using bolts, clamps, or other devices to secure them.
4. Apply pressure
- Apply a uniform pressure to the gasket according to its specifications using bolts, clamps, or an external device.
- The pressure must reach the design working range of the gasket to ensure its deformation fills the gap, but it should not be overloaded to avoid damage.
5. **Test Sealing**
- Install the product and subject it to pressure tests (such as water pressure or air pressure) or visual inspection to check for leaks.
- Conductive pads in electronic devices need to be tested for resistance or signal stability.
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### **三、注意事项**
1. **Pressure Range**
- Avoid exceeding the maximum bearing pressure of the gasket, otherwise it may lead to permanent deformation or rupture.
- Dynamic pressure scenarios (e.g., frequent start-stops) require the selection of high-elasticity materials.
2. **Temperature Restrictions
- Confirm the temperature resistance range of gasket materials (e.g., silicone temperature resistance -50°C to 250°C, while general rubber may only withstand temperatures below 100°C).
3. **Chemical Compatibility**
- When in contact with oils, acids, or solvents, it is necessary to choose materials with corresponding chemical corrosion resistance (e.g., fluorocarbon rubber resistant to strong acids).
4. Long-term maintenance
- Regularly check the gaskets for aging, cracking, or losing elasticity, and replace them in time.
- Avoid prolonged exposure to ultraviolet or ozone environments.
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### **Section Four: Common Questions and Solutions**
- **Leakage Issue**: Check if the installation is uneven, the pressure is insufficient, or the gasket size is incorrect.
- **Adhesive Pad Failure**: Adhesive pads may fail due to surface contamination or excessive temperature leading to delamination.
- Premature aging: Inappropriate material selection or environmental conditions beyond the tolerance range (e.g., high temperatures, chemical corrosion).
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### **Section Five: Selection Recommendations**
- **Industrial Seals**: Prioritize metal composite gaskets or graphite gaskets for pressure resistance and temperature resistance.
- **Electronics**: Choose conductive silicone pads or foam-type cushioning pads.
- "Medical/Food Grade": Materials that meet FDA standards or biocompatibility certification (e.g., platinum-cured silicone).
