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Rubber seal ring is mainly used in automobile, sensor, medical treatment, pharmacy, valve, pump, bathroom, bearing, electrical appliance, rocket, etc. it is required to have sealing materials with vacuum resistance, friction resistance, high temperature resistance and chemical corrosion resistance.
so to speak. In the industrial field, whether it is a single seal for repair and maintenance. It is not necessary to use O-ring in aerospace, automobile and general industry.
The low temperature performance of rubber is not good because of its own chemical structure, such as TG > 0 ℃ of 23-11 type. The low temperature properties of rubber used in practice are usually expressed by brittleness temperature and cold resistance coefficient of compression. The formula of rubber compound and the shape of product (such as thickness) have a great influence on the brittleness temperature. If the amount of filler in the formula increases, the brittleness temperature will deteriorate sensitively. With the increase of the thickness of the product, the brittleness mixing degree will also deteriorate sensitively
The radiation resistance of rubber is one of the worse elastomers. Type 26 rubber shows crosslinking effect after radiation, while type 23 rubber shows cracking effect. The results showed that the properties of 246 rubber changed dramatically under the radiation dose of 5 × 107 Lun in air. The hardness increased by 1 ~ 3 degrees, the strength decreased by less than 20%, and the elongation decreased by 30% ~ 50% under the condition of 1 × 107 Lun. Therefore, it is generally considered that 246 rubber can withstand 1 × 107 Lun, and the limit is 5 × 107 Lun.
From the above analysis, it can be seen that rubber skeleton oil seal is not suitable for low temperature and radiation conditions, but it is widely used in modern aviation, missile, rocket, space navigation, warship, atomic energy and other advanced technologies as well as automobile, shipbuilding, chemistry, petroleum, telecommunication, instrument, machinery and other industrial fields.
When rubber sealing ring is used for engine sealing, it can work at 200 ℃ ~ 250 ℃ for a long time, and work at 300 ℃ for a short time. Its working life is the same as that of engine repair, up to 1000 ~ 5000 flight hours (5 ~ 10 years)
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