How to choose a rubber gasket?

Rubber gasket as an important sealing material, widely used in automotive, electronics, chemical, pharmaceutical and other industries. It can effectively prevent the leakage of liquid or gas and ensure the normal operation of the equipment. However, when selecting a rubber gasket, several factors need to be considered to ensure that the selected product can meet the specific application needs. This article will explain in detail how to choose a rubber sealing gasket.

First, understand the types of rubber sealing gaskets

There are many kinds of rubber sealing gaskets, mainly including silicone gaskets, nitrile rubber gaskets, fluorine rubber gaskets and so on. Different types of rubber gaskets have different performance characteristics:

1. Silicone pad: has excellent high and low temperature resistance, can maintain good flexibility in the temperature range of -70℃ to +260℃. At the same time, it also has ozone resistance, weather aging resistance, non-toxic, waterproof, flame retardant, wear resistance, oil resistance and other excellent properties.

2. Nitrile rubber mat: known for excellent oil resistance, but also has good wear resistance, aging resistance and air tightness, widely used in rubber industry.

3. Fluorine rubber pad: excellent high temperature resistance, can be used in -20℃ to +200℃ environment, strong oxidizer resistance, oil resistance, acid and alkali resistance, suitable for high temperature, high vacuum and high pressure environment.

Second, consider the application and working conditions

When selecting rubber gaskets, the first thing to consider is the application and working conditions, including temperature, pressure, media, etc. :

1. Temperature: Select the appropriate rubber gasket according to the temperature range of the working environment. For example, in extremely high or very low temperature environments, gaskets with excellent temperature resistance such as silicone rubber or fluororubber should be selected.

2. Pressure: Determine the working pressure range and choose the gasket that can withstand the pressure. In general, metal and non-metal combination gaskets or metal gaskets are suitable for high temperature and medium pressure environments.

3. Medium: Understand the requirements of the working medium for the gasket. If there is corrosive medium, the gasket with acid and alkali resistance should be selected, such as fluorine rubber or neoprene rubber.

Third, consider the form of sealing surface and flange situation

The flange form also has an important impact on the choice of gaskets:

1.Smooth surface flange: generally used in low pressure environment, can be equipped with soft thin rubber sealing gasket. Under high pressure, thick soft pads or wound gaskets with internal reinforcing rings should be used.

2. Roughness: The roughness of the sealing surface has a significant impact on the sealing effect. Non-soft gaskets have higher requirements for the smoothness of the flange, while soft gaskets have lower requirements for the smoothness of the flange.

Four, pay attention to the specifications and quality of rubber gaskets

When selecting rubber gaskets, you should also pay attention to their specifications and quality requirements:

1. Size requirements: Determine the outer diameter, inner diameter, thickness and other dimensions of the gasket according to the application and equipment requirements to ensure that the gasket can completely cover the sealing interface.

2. Material requirements: Select the appropriate rubber material to meet the requirements of temperature, pressure and medium resistance.

3. Quality requirements: Check the sealing performance, compression deformation resistance, hardness, acid and alkali resistance, heat resistance and other indicators of the gasket to ensure stable and reliable performance.

5. Take other factors into account

In addition to the above points, other factors need to be considered, such as cost, delivery cycle, after-sales service, etc. :

1. Cost: Under the premise of ensuring performance, reasonably control costs and choose cost-effective products.

2. Supply cycle: Ensure that suppliers can supply in time to meet production needs.

3. After-sales service: Choose suppliers with good after-sales service so that problems can be solved in time during use.

Sum up

The selection of rubber gaskets is a process that requires comprehensive consideration of several factors. By understanding the performance characteristics of different types of rubber gaskets, considering the application and working conditions, paying attention to the form and flange of the sealing surface, and paying attention to the specifications and quality requirements of the gasket, you can ensure that the selected rubber gasket can meet the specific application needs and ensure the normal operation of the equipment.