What are characteristics of different rubber materials for gasket making?

Rubber gaskets are thin rubber products used to seal between two stationary surfaces of metal flanges or other connection parts. They have properties such as oil resistance, acid and alkali resistance, heat and cold resistance, and aging resistance. They are widely used in machinery, automobiles, electronics, chemicals, antistatic, flame retardant, medicine, food, and other industries. Below are the types, differences, and respective advantages and disadvantages of rubber gaskets.

Types and Differences

1. Rubber Flat Gasket

   • Characteristics: Easy to deform and not difficult to compress, but with poor pressure and temperature resistance. It is only used in situations with low pressure and temperature.
   • Materials and Temperature Range:
     • Natural rubber: Has certain acid and alkali resistance, and the operating temperature should not exceed 60°C.
     • Chloroprene rubber: Can also resist certain acids and alkalis, with an operating temperature of 80°C.
     • Nitrile rubber: Oil-resistant and can be used up to 80°C.
     • Fluororubber: Excellent corrosion resistance and better temperature resistance than general rubber. It can be used in media at 150°C.

2. Rubber O-Ring Gasket

   • Characteristics: The cross-sectional shape is a perfect circle, with a certain self-tightening effect. The sealing effect is better than that of a flat gasket, and the compression force is smaller.

3. Silicone Gasket

   • Characteristics: It has outstanding high and low temperature resistance, maintaining good service elasticity within the temperature range of -70°C to +260°C. It is resistant to ozone and weather aging.
   • Applications: Suitable for use as sealing gaskets in thermal machinery and is widely used in machinery, electronics, plumbing, and other industries.

4. Nitrile Rubber Gasket

   • Characteristics: It is a polymer copolymerized from butadiene and acrylonitrile. It is known for its excellent oil resistance and also has good abrasion resistance, aging resistance, and airtightness.
   • Applications: Widely used in the rubber industry.

5. Fluororubber Gasket

   • Characteristics: It has high temperature resistance and can be used in an environment of -20°C to +200°C. It is resistant to strong oxidizing agents, oil, acids, and alkalis.
   • Applications: Usually used in high-temperature, high-vacuum, and high-pressure environments, as well as in oil environments. It is widely used in the petroleum, chemical, aerospace, and aviation industries.

6. Chloroprene Rubber Gasket

   • Characteristics: It has resistance to oil, acids, alkalis, wear, high and low temperatures.

7. Other Rubber Gaskets

   • Such as ethylene propylene diene monomer (EPDM) gaskets and acrylate gaskets, which also have their own characteristics.

Advantages and Disadvantages

1. Advantages

   • Most rubber gaskets have properties such as oil resistance, acid and alkali resistance, heat and cold resistance, and aging resistance.
   • Silicone gaskets, fluororubber gaskets, and other specific materials have outstanding high and low temperature resistance or high temperature resistance.
   • Nitrile rubber gaskets are renowned for their excellent oil resistance.

2. Disadvantages

   • Rubber gaskets may be affected by factors such as temperature and pressure during use, leading to performance degradation or failure.
   • Certain specific materials may not be suitable for certain specific environments or media.

In summary, when selecting rubber gaskets, it is necessary to consider the specific operating environment and medium to ensure good sealing performance and durability.