EPDM rubber seals

??EPDM rubber is a low density, a density of 7 to 0.8. Can be combined with a large number of oil-filled and a filler, which can reduce the cost of rubber products, make up EPDM raw rubber shortcomings of high prices, and on the high Mooney EPDM value, the high padded physical and mechanical properties decrease slightly.

??EPDM seals ozone resistance, heat resistance, weather resistance, low temperature flexibility is good, it can be used for ozone resistance, weather resistance, ultraviolet occasion, but based on their structural characteristics, flame retardancy, oil resistance and poor adhesion. This rubber have saturated main chain structure, EPDM seals long-term use at 1 20 ?, may be short or intermittent use at 1 50 ~ 200 ?. Adding a suitable antioxidant can increase its temperature. Peroxide crosslinked EPDM rubber seal can be used under more severe conditions. EPDM rubber in the ozone concentration of 50 × 10 ~, stretched 30%, up 1 50 h or more without cracking. May be blended, the performance can learn from each other. EPDM rubber seal chemically stable main chain composed of a saturated hydrocarbon containing only unsaturated double bond in the side chain, it is essentially a kind of saturated rubbers. Since the nonpolar substituent groups within the molecular structure, intramolecular cohesive energy is low, so that the molecular chain can maintain the flexibility in a wide temperature range. The chemical structure of ethylene-propylene rubber to be vulcanized products with unique performance.

??Due to the lack of polar EPDM rubber seal, unsaturated low, and thus a variety of polar chemicals such as alcohols, acids, alkalis, oxidizing agents, refrigerants, detergents, animal and vegetable oils, ketones and the like have good fat but in the case of aliphatic and aromatic solvents genus (such as poor gasoline, benzene, mineral oil, and stability in the long-term effects of concentrated acid also decreased performance brings together nearly 400 kinds of corrosive in ISO / TR7620; the anti patience. of gaseous and liquid chemicals on the role of the various properties of rubber materials.

??EPDM rubber seals have excellent resistance to water vapor and is superior to the performance of its heat resistance. Superheated steam at 230 ?, no change in appearance nearly 1 00 h later.