What are the basic performance characteristics of sealing?
The basic performance of automotive rubber sealing strips includes controllable sealing performance requirements such as hardness, tensile properties, strength, elongation at break, and compression set. According to industry standards, automotive seal manufacturers are required to provide supply state data and data after hot air aging for these properties. Depending on the usage state, the temperature for hot air aging tests is generally selected at 70℃.
II. What are ozone aging resistance and atmospheric aging resistance?
Cars are exposed to all weather conditions for extended periods, thus they require rubber seals with good resistance to ozone aging and atmospheric aging.
1. Ozone aging resistance: Ozone aging refers to a technique that utilizes environmental simulation to accelerate the aging process of rubber caused by ozone, based on the characteristic that rubber is sensitive to ozone. This technique is used to test the aging resistance of rubber products.
2. Hot air aging (air oven aging) refers to the change in material properties over time under the influence of hot air.
3. Natural ageing refers to various changes that occur in polymer materials when they are exposed to outdoor conditions for a long time, also known as atmospheric ageing.
III. What is paint resistance?
Automotive rubber seals are directly installed on the vehicle body and come into direct contact with the painted panels. Substances leached from the paint can interact with the rubber seals, thereby accelerating their aging. Therefore, paint resistance is one of the conventional properties of sealing materials.
What are the standards for the low-temperature performance of seals?
Automotive seals typically operate within a temperature range of -40℃ to 70℃, necessitating excellent low-temperature resistance. This refers to the brittle temperature threshold of sealing strip materials.
