Oil resistance
Oil resistance Rubber in oil medium (fuel oil, lubricating oil, hydraulic oil, etc.), especially at higher temperature, will cause expansion, softening and reduction of strength and hardness, and plasticizers or soluble substances in rubber may be leached by oil , resulting in weight reduction, volume reduction, and leakage. Therefore, the oil resistance of rubber is an important property of working rubber in an oil medium. Generally, the weight change, volume change, strength, elongation and hardness change are measured after soaking in oil for a certain temperature at a certain temperature. It can be expressed by the oil resistance coefficient, that is, the ratio of the strength or elongation after immersion in the medium to the original strength or elongation

Aging resistance
Aging resistance Rubber will deteriorate its performance after being affected by factors such as oxygen (air), ozone, heat, light, moisture and mechanical stress, which is called aging of rubber. The aging resistance of rubber can be measured by natural aging and artificial accelerated aging tests (thermal aging, damp heat aging, ozone aging, etc.). The aging resistance can be expressed by the change of the strength, elongation or hardness of the sample after aging, and it can also be expressed by the aging coefficient, that is, the tensile strength, elongation at break or tensile strength and breakage of the sample after aging. The ratio of the product of the elongation to the original value, correspondingly called the

The aging coefficient calculated by tensile strength (referred to as the aging coefficient by strength), the aging coefficient calculated by the elongation at break (referred to as the aging coefficient by elongation), or the aging coefficient calculated by the tensile product (referred to as the tensile product). aging factor).

Other properties
In addition, the rubber for shock absorption should also consider its dynamic mechanical properties, such as dynamic modulus and damping; the diaphragm material should also consider its breaking strength and fatigue properties; the rubber used for electrical insulation should also consider its electrical properties; rubber adhesives should be considered Its bonding properties to various adherends, including peel strength, pull-off strength and shear strength.