Short Description:

The advantages and disadvantages of PDM hose: aging resistance, electrical insulation and ozone resistance are outstanding. Excellent weather resistance, ozone resistance, heat resistance, acid and alkali resistance, water vapor resistance, color stability, electrical properties, oil filling properties and room temperature fluidity. Detergents, animal and vegetable oils, ketones and greases all have good resistance; but they have poor stability in fatty and aromatic solvents (such as gasoline, benzene, etc.) and mineral oils. Under the long-term action of concentrated acid, the performance will also decrease the water vapor resistance and is estimated to be better than its heat resistance. In 230℃ superheated steam, there is no change in appearance after nearly 100h. But under the same conditions, fluorine rubber, silicon rubber, fluorine silicon rubber, butyl rubber, nitrile rubber, and natural rubber experienced obvious deterioration in appearance after a short period of time. Because there are no polar substituents in the molecular structure of ethylene-propylene rubber, the cohesive energy of the molecule is low, and the molecular chain can maintain flexibility in a wide range, second only to natural rubber and butadiene rubber, and can still be maintained at low temperatures. Ethylene-propylene rubber lacks active groups due to its molecular structure, has low cohesive energy, and the rubber is easy to bloom, and its self-adhesiveness and mutual adhesion are very poor.