Dongguan Bo Cheng electronic products company with you to fully understand the physical properties of silica gel!

　1 high temperature resistance:
Silica is the most prominent characteristic of high temperature stability, and can be used in the environment of 250 C -300 C for a long time. If you choose the appropriate silica fillers and silicone additives, the use of temperature up to 375 degrees and resistant moment of thousands of degrees high temperature. It is estimated that the use of silica gel at 120 C for up to 20 years, up to 150 years at 5, not easy to aging.
2 low temperature flexibility:
Silica gel has intrinsic low temperature elasticity. Natural rubber or other synthetic rubber has a low brittleness point, silicone generally available in the -50 C ~ -60 C low temperature normal work. 3 air permeability: silicone film with good air permeability. Room temperature on air, nitrogen, oxygen, carbon dioxide and other gases, the gas permeability of 30-50 times higher than natural rubber.
3 electrical properties:
Silica gel has excellent electrical properties. The prominent advantages of dielectric strength, power factor and insulation performance is affected by the change of temperature and frequency is very small, in a wide temperature range, dielectric constant and dielectric loss angle tangent value is almost unchanged. The corona resistance and arc resistance of silica gel are also very good. Breakdown voltage: 20 ~ 25 kV / mm; dielectric constant of 3-32 dielectric loss angle tangent ~, 5X10-3; volume resistivity 1X1016 ohm / cm.
4 excellent physical and mechanical properties:
Hardness in 35~75 Shaw A, tensile strength from dozens to 105KG/CM2, elongation at 1000%, these properties due to the different needs of the product to be adjusted. Although the mechanical properties of silica gel at room temperature is lower than general rubber, but at high temperature of 150 C, its mechanical properties are far superior to general rubber, silicone compression for 7%-10%, no change in mechanical properties.
5 weather resistance:
Silica gel has excellent resistance to oxygen, ozone resistance, resistance to long-term outdoor use does not crack ultraviolet irradiation performance.
6 physiological inertia:
Silica gel itself is inert to humans, it does not smell, tasteless, non-toxic. In addition, silica gel has low surface activity and low temperature resistance.
7 resistance to chemical properties:
Generally speaking, silica gel has good resistance to chemicals, fuel oil and oil properties. The solvent effect on silica gel is the main expansion and softening, and once the most original performance after solvent evaporation and recovery of silica gel. For ethanol, acetone and other polar and edible oil and so on tolerance ability is quite good, the mechanical property basically does not reduce, to the low concentration acid, the alkali, the salt tolerance is good. (as in the 10% sulfuric acid at room temperature for 7 days, the volume and weight changes are less than 1%, no change in mechanical properties) but it is not resistant to concentrated sulfuric acid, concentrated alkali and carbon tetrachloride, toluene and other nonpolar solvents.
Owing to the excellent physical properties of silica gel, so all walks of life in all areas have a very wide range of applications, luminous silicone products, wear and corrosion resistance of silicone products and so on.