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Performance advantages of EPDM rubber sealing ring

EPDM rubber seals are widely used, and have gradually begun to be applied in China. Compared with other ordinary rubber seals, they have good anti-aging properties.

According to the relevant test report: EPDM rubber is naturally aged for 23 years at a cross-sectional compression rate of 30%, and the compression set is less than 10%; while other ordinary rubbers are naturally aged at a cross-sectional compression rate of 30%. In a few years, the compression set has exceeded 10%. In a medium containing 50ppm of ozone, when the static stretching is 30%, the EPDM rubber will crack for more than 150 hours; while the butyl rubber will crack within a few hours. In a medium containing 100 ppm ozone, EPDM rubber did not crack after 2430 hours; while butyl rubber had large cracks in only 534 hours, and neoprene cracked in 46 hours.

Due to the difference in the molecular structure of EPDM (EPDM), the performance difference of rubber seals is largely determined: in the molecular structure of common rubber such as styrene butadiene rubber (SBR) and natural rubber (NR) that are widely used at present Containing a large amount of CC unsaturated double bonds, it is easy to chemically react with the active materials in the air or in the medium (such as ozone, oxygen, metal ions, mold, etc.), causing the rubber molecular chain to break, crosslink and other aging, thereby making the rubber Loss of elasticity leads to seal failure; while the molecular structure of EPDM is mainly composed of CH bond, due to its lack of polarity, low degree of unsaturation, extremely high chemical stability, and excellent chemical resistance. Therefore, various polar chemicals such as alcohols, acids (acetic acid, hydrochloric acid, etc.), strong alkalis (sodium hydroxide), oxidants (hydrogen peroxide, hypochlorous acid, sodium perbromate), detergents, animal and vegetable oils, ketones and certain These esters all have greater resistance, and their properties do not change much after long-term contact. Their properties (especially anti-aging properties) are much better than ordinary rubbers such as styrene butadiene rubber (SBR) and natural rubber (NR).

Through the above analysis and examples, EPDM rubber seals have the following significant advantages compared with other ordinary rubber seals:

1. The best aging resistance. This is one of the most significant features of EPDM rubber. Its aging resistance is not only much better than ordinary rubber such as styrene butadiene rubber, natural rubber, and neoprene rubber, but also better than butyl rubber, which is generally considered to have good aging resistance.

2. Excellent chemical stability. When EPDM rubber is used for a long time in contact with various polar chemicals, its performance changes little. When other ordinary rubber comes into contact with various polar chemicals, it will obviously accelerate its aging process.

3. It has excellent resistance to compression set and compression stress relaxation. EPDM rubber has very small compression set and slow stress relaxation, and its compressive deformation resistance is better than other ordinary rubbers.

4. It has high flexibility. In general rubber, its elasticity is second only to natural rubber and butadiene rubber, and higher than other common rubbers.

According to relevant information, the service life of EPDM rubber ring is substantially longer than that of ordinary rubber ring. Compared with the normal service life of the ordinary rubber ring used today, which is 30-50 years, it is very different. Under the same environmental conditions (that is, the buried depth is 0.5-3.0m, the ambient temperature is 18°C-22°C), after calculation The normal service life of EPDM rubber sealing ring is 110 years. Pay attention to the construction according to the specification. EPDM rubber sealing ring can match the operating life of the ductile pipe from 70 to 100 years, so that the pipeline network is safe to operate. Get fundamental protection.

FKM imported perfluorinated O-ring perfluorinated o-ring seal features:

1. High temperature;

2. Strong corrosion resistance;

3. Ultra-cleanliness. Imported perfluorinated O-ring seal.

Scope of application:

1. Chemical process and petroleum refining: the Sealing products are used in mechanical seals, pumps, reactors, agitators, compressor housings, valves, various instruments and other equipment. Usually used as packing for valve seats and stems, diaphragms and gaskets.

2. Analysis and process instruments: partitions, diaphragms, cylindrical accessories, hoops, gaskets, etc.

3. Semiconductor manufacturing

4. Food and pharmaceutical

5. Aviation and aerospace