Glue is also known as the seal, a rubber strip. According to the raw materials can be classified as natural rubber sealing strip, EPDM seal, PVC rubber sealing strips and silicone products. Now I will introduce some of the properties of the sealing strip.
The use of natural rubber seal is relatively low, the price is relatively high. Compared with most synthetic rubber, natural rubber has good comprehensive mechanical properties, cold resistance, high resilience and wear resistance. Natural rubber is not resistant to mineral oil, but is stable in vegetable oils and alcohols. In hydraulic brake system of n-butanol and refined castor oil mixed liquid of brake fluid as sealing glue bowl, aprons with natural rubber manufacturing, sealant is also commonly used natural rubber manufacturing < br / >
Ternary ethylene propylene seal good elasticity and smooth surface, the service life is about 14 years, high cost, high quality of EPDM sealing strip can be recovered, for enterprises, it can be regarded is a way to reduce costs. Three EPDM sealing strips of high and low temperature resistance, good weather resistance, aging resistance, corrosion resistance. Conductive flame retardant insulation.
The backbone of EPDM rubber is not containing double bond of fully saturated straight chain type structure, its side chain diene Jing, sulfur vulcanization. EPDM rubber has excellent resistance to aging and ozone resistance, weatherability, heat (in 120 DEG C environment in long-term use), chemical (such as alcohol, acid, alkali, oxidation agent). Not resistant to aliphatic and aromatic solvents erosion. Three EPDM rubber is density in the characteristics of high filling low, but the lack of self adhesive and mutual adhesive. In addition, three EPDM has outstanding steam resistance, resistant to steam can produce diaphragm seal products and so on. EPDM rubber has been widely used in washing machines, TV accessories, doors and windows sealing products, or more complex profile rubber strip production.
PVC elastic rubber seal is poor, can not be recovered, the use of a comparatively short period of time, usually 1--7 years, not environmental protection. Low cost. Heat resistant.
The price of silicone products is 45---60 yuan / kg. Silicone rubber has prominent advantages of high temperature resistance, ozone resistance and weathering performance, in 70 ~ 260 C working temperature range can be maintained its unique flexibility and ozone resistance, weather resistance and other advantages, suitable for the production of thermal sealing pad, such as strong light source lamp cover sealing gasket, valve pad, etc. Due to the high mechanical strength and low mechanical strength of silicone rubber, it is not suitable for the production of oil seal products.
This shows that the use of the seal also contains a lot of knowledge, the performance difference between different materials, such a large seal. Here to remind you about the first choice of the seal must be considered when the environment, according to the above description to choose the seal you need.
