When the O-ring loss seal characteristic,what should we do?
O-rings are included in rubber products. O-rings are a kind of sealing material. In everyone’s daily life, if we don’t pay attention to all normal applications of O-rings, O-rings will lose their sealing characteristics. Lose its practical significance. If this kind of situation occurs, how to solve it?
1. The whole process of temperature and relaxation
High temperature will accelerate the embrittlement of elastomer materials. The higher the temperature during operation, the greater the long-term compression deformation of the O-ring. When the long-term deformation exceeds 40°, the O-ring will lose its sealing ability and cause leakage.
The original stress value generated in the elastomer material of the O-ring due to the compression deformation will gradually decrease with the effect of the relaxation of the O-ring and the temperature reduction effect. For O-rings in sub-zero temperature, the original compression is likely to be reduced or completely subside due to the substantial decrease in temperature.
2. Compression rate and amount of stretch
The vulcanized rubber of various secret recipes commonly used in the production of O-rings will cause the compression stress to relax under compression. At this time, the compression stress will decrease with the increase of time. The longer the use time, the greater the compression rate and the amount of stretching, the greater the reduction in stress caused by the stress relaxation of the vulcanized rubber. The ductility of the ** O-ring is insufficient and the sealing ability is lost.
Food grade O-rings are also made of vulcanized rubber, but generally vulcanized rubber is not suitable for touching food due to the addition of various compounds. O-ring vulcanized rubber used for food has strict control of additives. , Food grade O-ring vulcanized rubber generally uses silicone rubber and EPDM.
To put it bluntly, food grade means that it is not easy to cause harm to physical and mental health when used in a specific place; only according to the evaluation of the tripartite organization, can it be clear whether it is food grade; the evaluation of the tripartite organization is only for whether it is suitable for special applications Specifications. For example, the “food-grade” specification used on the kitchen stove is different from the “food-grade” specification used on the cup. No matter how good it is, it cannot be called “food grade”.https://michuoilseal.com/product/pu-x-seal/
