Silica gel is a high-low temperature resistant variety in the current rubber varieties. It can withstand low temperatures of 90 degrees Celsius and high temperatures up to 300 degrees Celsius. Ordinary silica gels typically operate at temperatures ranging from minus 40 degrees to over 180 degrees. In fact, silica gel is often used because of its thermal properties. For example, in the cold winter, some rubber parts must use silica gel.
Generally, silica gel is insulated, and special silica gel is conductive. The parameter for determining whether silica gel is conductive is volume resistivity, the unit is Ω*m, and the volume resistivity is above the value of 109 for insulating silica gel. The value is between 106-109. , is antistatic silicone, below 106 is conductive silica gel.
The operating time is calculated from the moment the colloid is added to the vulcanizing agent. There is no complete limit between this operation time and the subsequent vulcanization time. The colloid has been vulcanized since the moment the vulcanizing agent was added. This operation time means that the product's 30-minute vulcanization reaction can not affect the quality of the finished product. Therefore, the more time saved during the operation of the product, the more favorable it is to the finished product.
Some places will say that it is curing time. That is to say, after such a long period of time, the vulcanization reaction of the silica gel is basically finished. This basically ends, which means that the product is already available, but in fact there is still a small part of the curing reaction is not over yet. Therefore, products made of silicone rubber, such as silicone molds, are usually put on for a while before being put into use.
Silicone products manufacturers use silica gel alias: Silicic acid gel is a highly active adsorbent material, which is an amorphous substance with a chemical molecular formula of mSiO2·nH2O; it does not react with any substance except strong alkali and hydrofluoric acid, and is insoluble. It is non-toxic and tasteless and chemically stable in water and any solvent. Various types of silica gels have different microporous structures due to their different manufacturing methods. The chemical composition and physical structure of silica gel determine that it has many other similar materials that are difficult to replace: high adsorption performance, good thermal stability, chemical stability, and high mechanical strength. Silica gel is classified according to its pore size: macroporous silica gel, coarse pore silica gel, B-type silica gel, fine pore silica gel, and the like.