??Categories Xinhua Xu rubber silicone seals, properties and uses

??Hydraulic seals having high and low temperature performance, -70 ? - good use of flexibility within the temperature range of + 260 ?, and there is resistance to ozone, weather aging silicone hydraulic seals.

??In the absence of any toxic can be made insulation, insulation products and medical silicone products, but also has a variety of excellent performance waterproof, fire retardant, high temperature, electrical conductivity, abrasion resistance, oil, etc., in line with EU environmental standard.

??Silicone rubber hydraulic seal Use: Automotive air-conditioning, fitness equipment, machinery, electronics, plumbing, electrical and electronic, lighting fixtures, household appliances, audio equipment, machinery and equipment, metal profiles, production lines sanitary, electrical appliances, medical equipment and communications equipment.

??Silicone rubber hydraulic seals Goods partial resistance to a hard object pressed into its surface known as hardness. Silicone rubber having a Shore A hardness in the range 10 to 80, which give the designer with the freedom to choose the desired hardness, to optimally perform specific functions. On the polymeric substrate, a filler and additives can be mixed in different proportions to achieve a variety of intermediate hardness values. Similarly, the heat curing time and temperature also change the hardness, without damaging other physical characteristics.

??Silicone rubber hydraulic seal tensile strength refers to the range required for each unit caused by a rubber material samples tearing force. Heated solid organic sulfur-type silicone rubber tensile strength range between 4.0-12.5MPa. Fluorosilicone rubber tensile strength range between 8.7-12.1MPa. Tensile strength range between the liquid silicone rubber 3.6-11.0MPa.

??Silicone rubber hydraulic seal on the notched samples hinder the expansion of cuts or nicks resistance when force is applied. Even after cutting into extremely high torsional stress, heat and sulfur-type solid silicone rubber can not be torn. Sulfur-type heat-solid silicone rubber tear strength range between 9-55 kN / m. Fluorosilicone rubber tear strength range between 17.5-46.4 kN / m. Liquid silicone rubber tear strength range between 11.5-52 kN / m.

??Elongation of the silicone rubber hydraulic seal usually refers to "limit elongation at rupture" or a percentage of the original length of the growing fracture when the sample relative. Hot sulfur-type solid silicone rubber general elongation in the range of 90-1120%. Fluorosilicone rubber general elongation of between 159-699%. Liquid silicone rubber general elongation of between 220 to 900 percent. Choose different processing methods and a hardener can be widely varied its elongation. Silicone rubber elongation and temperature have a great relationship.

??Silicone rubber hydraulic seal operation time is counted from the colloidal vulcanizing agent at that moment. The operating time and curing time behind that fact is not fully boundaries colloid vulcanizing agent is added from the moment it has been vulcanization reaction, this means that the operation time of the vulcanization reaction product of 30 minutes may not affect the quality of the finished product. So during product operation to save more time on the finished product, the better.

??Silicone rubber hydraulic seal curing time, some places will say is the curing time. That after such a long time vulcanized silicone reaction is essentially over. This basically means that the end product is already available, but in fact there is a very small part of the curing reaction is not over yet. So make use of silicone rubber products, such as silicone molds usually put some time and then put into use.

??Silicone rubber hydraulic seals aging reasons

??1, silicone rubber hydraulic seal in the action of heat, raising the temperature silicone rubber products can cause thermal cracking or thermal crosslinking. However, the basic effect of heat or activation. Enhance the role of oxygen diffusion rate and activation of the silicone rubber hydraulic seals oxygen, oxygen generation in rubber with rubber molecules radical chain reaction, molecular chain was broken or excessive crosslinking, cause changes in the properties of silicone rubber products. Oxidation is one of the important reasons for the aging of rubber.

??3, Silastic hydraulic seal in light of reason, the shorter the light, the greater the energy. Rubber from the damaging effects of higher energy ultraviolet light. In addition to direct ultraviolet rays cause breakage and crosslinked rubber molecular chain, the rubber due to absorption of light energy to produce free radicals initiate and accelerate the oxidation chain reaction process. After heating the outside light plays role. Another characteristic of the optical effect of its director (with different thermal action) is that it is mainly in the rubber surface into the students. Gum containing sample rate, and net cracks will appear on both sides of the so-called "outer light crack."

??4, silicone rubber hydraulic seal effect of ozone in much higher ozone chemically active oxygen, more destructive, it also is the molecule chain was broken, but the effects of ozone on the case of the rubber with different deformation of rubber or not. As for the deformation of the rubber (mostly unsaturated rubber) occurs when the stress crack straight direction, i.e., so-called "ozone cracking"; when applied to deform a rubber, not only the surface oxide film cracks.

??5, silicone rubber hydraulic seal in moisture role, the role of water has two aspects: silicone rubber products in moist air or rain soaked in water, easy to destroy, this is due to the rubber and water-soluble substances Tsuen group other ingredients dissolved by water extraction. Hydrolysis or absorption causes. Particularly in the alternate action of water immersion and atmospheric exposure, it will accelerate the destruction of rubber. But in some cases they can not afford to water damaging effects on the rubber, and even slow down the aging effect.

??6, silicone rubber hydraulic seal mechanical stress in the under repeated mechanical stress effect, would generate free rubber molecular chain Tsuen, triggering oxidation chain reaction to form a force chemical process. Mechanical and fracture mechanical activation of molecular chain oxidation process. How could a dominant, depending on which conditions. Moreover, under stress easily lead to ozone cracking.

??7, silicone rubber hydraulic seal is also attributed to other aspects of chemical mediators, variable valence metal ions, high-energy radiation, electrical and biological.

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