Hongfeng take you to understand the product characteristics of epdm seal strip

Epdm seal strip has been widely used in the automotive seal and high-end doors and Windows industry, the following take you to understand the product characteristics of epdm seal strip:

1. Low density and high filling

Epdm is a lower density rubber with a density of 0.87. In addition, a large amount of oil and filler can be added to reduce the cost of rubber products, which makes up for the high price of ethylene propylene rubber, and for ethylene propylene rubber with high gmentney value, the reduction of physical and mechanical energy after high filling is not significant.

2. Aging resistance

Epdm sealant strip has excellent weather resistance, ozone resistance, heat resistance, acid and alkali resistance, water vapor resistance, color stability, electrical performance, oil filling and room temperature fluidity. Ethylene propylene rubber products at 120℃ can be used for a long time, at 150-200 ℃ can be used briefly or intermittently. Adding suitable antiaging agent can raise its service temperature. Epdm sealant strips crosslinked with peroxides can be used in harsh conditions. Under the condition of ozone concentration 50pphm and stretch 30%, epdm rubber can reach 150h and above without cracking.

3. Corrosion resistance

Due to the lack of polarity and low degree of saturation of epdm sealant strip, it has better resistance to various polar chemicals such as alcohol, acid, alkali, oxidant, refrigerant, detergent, animal and vegetable oil, ketone and lipid. But the stability is poor in lipid and aromatic solvents (such as gasoline, benzene, etc.) and mineral oils. In the long - term action of concentrated acid performance will also be reduced. ISO/TO 7620 collects information on the effects of nearly 400 corrosive gaseous and liquid chemicals on the properties of various rubber products, and specifies grades 1-4 TO indicate the degree of action and the effects of corrosive chemicals on the properties of rubber products.

4. Electrical properties: epdm has excellent electrical insulation properties and corona resistance, and its electrical properties are better than or close to styrene butadiene rubber, chlorosulfonated polyethylene, polyethylene and crosslinked polyethylene.

5. Elasticity: there is no polar substituent group in the molecular structure of epdm, the molecular cohesion energy is low, the molecular chain can maintain the flexibility in a wide range, second only to natural rubber and butadiene rubber, and it can still maintain at low temperature.

6. Adhesiveness: because of the lack of active groups in the molecular structure, ethylene propylene diene rubber has a low cohesion energy, and the adhesive is easy to spray frost, so its self-adhesive and mutual adhesive are very poor.