Français
① Thermal conductivity rubber is a poor conductor of heat, its thermal conductivity in the thickness of 25 millimeters is about 2.2 ~ 6.28 watts / meter 2.0 K. It is an excellent thermal insulation material, if the rubber is made into a microporous or sponge state, its thermal insulation effect will be further improved, so that the thermal conductivity down to 0.4 ~ 2.0 watts. Any rubber parts in use, may be due to hysteresis loss of heat, so attention should be paid to heat dissipation.
② thermal expansion due to the rubber molecular chain has a large free volume, when the temperature rises its chain segments of the internal rotation becomes easier, will make its volume larger. Rubber linear expansion system 2 thermal expansion due to the rubber molecular chain has a large free volume, when the temperature rises its chain segment of the internal rotation becomes easier, will make its volume larger. The coefficient of linear expansion of rubber is about 20 times that of steel. This must be taken into account in the design of the vulcanization model of the rubber product, because the linear size of the finished rubber product will be 1.2 ~ 3.5% smaller than the model. For the number is about 20 times that of steel. This must be considered in the design of the vulcanization model of the rubber product, because the linear dimensions of the finished rubber product will be 1.2 ~ 3.5% smaller than the model. For the same kind of rubber, the hardness of the rubber and raw rubber content of the rubber shrinkage also has a greater impact, shrinkage and hardness is inversely proportional to the rate of rubber is directly proportional. Various kinds of rubber the same kind of rubber, rubber hardness and raw rubber content on the rubber shrinkage also has a greater impact on the shrinkage rate, shrinkage and hardness is inversely proportional to the rate of rubber content is proportional. Various kinds of rubber in the theoretical shrinkage of the size of the order of: in the theoretical shrinkage of the size of the order of:
Fluoroelastomer>Silicone Rubber>Butyl Rubber>Nitrile Rubber>Chloroprene Rubber>Styrene Butadiene Rubber>Natural Rubber Fluoroelastomer>Silicone Rubber>Butyl Rubber>Nitrile Rubber>Chloroprene Rubber>Styrene Butadiene Rubber>Natural Rubber
② thermal expansion due to the rubber molecular chain has a large free volume, when the temperature rises its chain segments of the internal rotation becomes easier, will make its volume larger. Rubber linear expansion system 2 thermal expansion due to the rubber molecular chain has a large free volume, when the temperature rises its chain segment of the internal rotation becomes easier, will make its volume larger. The coefficient of linear expansion of rubber is about 20 times that of steel. This must be taken into account in the design of the vulcanization model of the rubber product, because the linear size of the finished rubber product will be 1.2 ~ 3.5% smaller than the model. For the number is about 20 times that of steel. This must be considered in the design of the vulcanization model of the rubber product, because the linear dimensions of the finished rubber product will be 1.2 ~ 3.5% smaller than the model. For the same kind of rubber, the hardness of the rubber and raw rubber content of the rubber shrinkage also has a greater impact, shrinkage and hardness is inversely proportional to the rate of rubber is directly proportional. Various kinds of rubber the same kind of rubber, rubber hardness and raw rubber content on the rubber shrinkage also has a greater impact on the shrinkage rate, shrinkage and hardness is inversely proportional to the rate of rubber content is proportional. Various kinds of rubber in the theoretical shrinkage of the size of the order of: in the theoretical shrinkage of the size of the order of:
Fluoroelastomer>Silicone Rubber>Butyl Rubber>Nitrile Rubber>Chloroprene Rubber>Styrene Butadiene Rubber>Natural Rubber Fluoroelastomer>Silicone Rubber>Butyl Rubber>Nitrile Rubber>Chloroprene Rubber>Styrene Butadiene Rubber>Natural Rubber
Rubber products should pay special attention to the impact of volume contraction when used at low temperatures, for example, oil seals will produce leakage due to contraction, rubber and metal bonded products will produce excessive stress due to contraction and lead to early damage.
