The raw material of sponge rubber sealing strip is ethylene propylene diene (EPDM) rubber for synthetic rubber, its characteristics are as follows:

1, sponge rubber seal low density high filling: epdm rubber is a low density of rubber, its density is 0.87.

2. Aging resistance: ethylene propylene rubber has excellent weather resistance, ozone resistance, heat resistance, acid and alkali resistance, water vapor resistance, color stability, electrical function, oil charging and normal temperature fluidity.

3, corrosion resistance: due to the lack of polarity of ethylene propylene rubber, not full of low, so for a variety of polar chemicals such as alcohol, acid, alkali, oxidant, refrigerant, detergent, animal and vegetable oil, ketone and fat have good resistance; However, the stability of lipid and aromatic solvents such as gasoline, benzene and mineral oil is poor. Function is also reduced under the long - duration effect of concentrated acid.

Four, water vapor resistance: ethylene propylene rubber has excellent water vapor resistance and better than its heat resistance. In the superheated steam at 230℃, the appearance remained unchanged after nearly 100h. However, fluoro rubber, silicone rubber, fluoro silicone rubber, butyl rubber, nitrile butadiene rubber and natural rubber experienced obvious deterioration in appearance in a short time under the same conditions.

5, over water resistance: epdm rubber over water resistance is also good, but it is closely related to the curing system. With disulfide, TMTD vulcanized system of ethylene propylene rubber, immersed in 125 ℃ superheated water for 15 months, mechanical function change is very small, volume expansion rate is only 0.3% so now the mall above 80% are selected sponge rubber seal as an important sealing material and insulation rubber.