What are the characteristics of epdm seals?

Characteristics of EPDM sealing strip

1. Low density and high filling: EPDM is a kind of low density rubber with a density of 0.87. In addition, a large number ofOil filling and filler addition reduce the cost of rubber products and make up for the high price of the original EPDM. In addition, yes

For EPDM with high Mooney value, the physical and mechanical properties of high filled EPDM will not be significantly reduced.

2. Aging resistance: EPDM has excellent weather resistance, ozone resistance, heat resistance, acid and alkali resistance and water vapor resistanceProperty, color stability, electrical performance, oil filling and room temperature fluidity. EPDM products can be used for a long time at 120 ℃

It can be used for a short time or intermittently at 150-200 ℃. Adding appropriate antioxidants can increase the service temperature. Crosslinking with peroxide

The EPDM can be used under worse conditions. When the ozone concentration is 50 × The tensile strength is 30% and the fracture strength is

The cracking time shall not exceed 150 hours.

3. Corrosion resistance: due to the lack of polarity and low unsaturation of ethylene propylene rubber, it is resistant to various polar chemicals, such as alcohol, acid

Alkali, oxidant, refrigerant, detergent, animal and vegetable oil, ketone, grease, etc. have good corrosion resistance; But in aliphatic and aromatic

Aromatic solvents (such as gasoline, benzene, etc.) and mineral oils. Under the long-term action of concentrated acid, the performance will also decline. In isotr7620

, data on the effects of nearly 400 corrosive gases and liquid chemicals on various properties of rubber were collected. It is made of first-class ethylene propylene rubber

There are more than 80 kinds of chemicals with different degrees of use, which are not listed here one by one.

4. Water vapor resistance: EPDM has excellent water vapor resistance and excellent heat resistance. Overheating at 230 ℃

In the steam, the appearance has not changed after nearly 100 hours. Under the same conditions, fluororubber, silicone rubber, fluorosilicone rubber and butyl

The appearance of rubber, nitrile rubber and natural rubber deteriorated significantly in a short time.

5. Hot water resistance: EPDM also has good heat and water resistance, but it is closely related to the vulcanization system used. 125℃

After soaking in superheated water for 15 months, the mechanical properties of ethylene propylene rubber vulcanized with dimethylmorpholine dithiocarbamate and TMTD changed little,

The volume expansion rate is only 0. Electrical properties: EPDM has excellent electrical insulation and corona resistance, and its electrical properties are better than or

Close to styrene butadiene rubber, chlorosulfonated polyethylene, polyethylene and cross-linked polyethylene.

6. Elasticity: there is no polar substituent in the molecular structure of EPDM, the molecular cohesion energy is low, and the molecular chain energy is wide

Maintain flexibility within the range, second only to natural rubber and cis-polybutadiene rubber, and can still maintain flexibility at low temperature.