1 high temperature resistant performance:
The most significant characteristics of high temperature stability of silica gel is strong, can be used for a long time at 250 DEG -300 DEG environment. If the choice of silica filler and silicone proper additives, the use of temperature can reach 375 DEG C, and high temperature resistant moment of thousands of degrees. It is estimated that the silica gel at 120 DEG C, the service life of up to 20 years, up to 150 degrees in the next 5 years, not easy ageing.
2 low temperature resistant elastic:
Silica gel has the advantages of low temperature elastic inner. Natural rubber and other synthetic rubber has the brittle point lower, silica gel can generally operate at -50 to -60 DEG C under low temperature. 3 permeability: silica gel film has good air permeability. At room temperature in air, nitrogen, oxygen, carbon dioxide and other gases permeability is 30-50 times higher than natural rubber.
4 electrical performance:
Silica gel with excellent electrical property. Having the advantages of dielectric strength, power factor and the change of insulation properties with temperature and frequency is very small, in a very wide temperature range; the dielectric constant and dielectric loss angle tangent value is almost constant. Silica gel corona resistance and arc resistance is also very good. Breakdown voltage: 20~25 kV / mm; dielectric constant of 3~32 dielectric loss tangent 3~3, 5X10-3; volume resistivity 1X1016 ohm / cm.
5 excellent physical and mechanical properties:
Between the 35~75 shore A hardness, tensile strength from dozens to 105KG/CM2, elongation at less than 1000%, these properties because of different products need to be adjusted. Although the silica gel in the mechanical properties of room temperature than general rubber is low, but in the high temperature of 150 DEG C, its mechanical performance is far superior to general rubber, silica gel compression permanent degeneration of mechanical properties for 7%-10%, no change.
6 weather resistance:
Silica gel has excellent resistance to oxygen, ozone resistance, resistance to long-term outdoor use does not crack ultraviolet irradiation resistance.
7 physiological inert:
Silica gel itself is inert to humans, it is odorless, tasteless, non-toxic. In addition, the silica gel has low surface activity and the low temperature properties.
8 resistance to chemicals:
In general, the silica gel has good resistance to chemicals, fuel oil and oil resistant performance. The solvent effect on silica gel is mainly the expansion and softening, and once the most primitive performance after solvent evaporation and recovery of silica gel. Ethanol and acetone on the polarity and oils, tolerance is quite good, basic mechanical performance is not reduced, for low concentration of acid, alkali, good tolerance to salt. (as in 10% sulfuric acid at room temperature for 7 days, impregnation volume and weight changes are less than 1%, the mechanical properties of no change) but it is not resistant to concentrated sulfuric acid, strong alkali and carbon tetrachloride, toluene and other non polarity solvent.