A. Silica gel raw materials are generally gel-like, somewhat similar to plasticine, colorless, translucent, and odorless.

B. Its main features are both high temperature resistance (300 ℃) and low temperature resistance (low -100 ℃), it is the current cold and high temperature resistant rubber; at the same time, it has excellent electrical insulation, high stability to thermal oxidation and ozone, and is chemically inert. big. The disadvantage is that the mechanical strength is low, the oil resistance, solvent resistance and acid and alkali resistance are poor, it is difficult to vulcanize, and the price is more expensive. Operating temperature: -60℃-+200℃. The above is the description of silicone rubber in the manual.

C. Use temperature: As mentioned above, it is generally set to -40°C-200°C, and can reach 230°C in a short time.

D. Aging problem: oil resistance, acid and alkali resistance are poor, and it has little to do with the stress.

E. Adhesion problem: Before surface treatment, in addition to using silicone products as adhesives to bond with silicone parts, the adhesion to other parts must be surface activated, and the glue surface can be cured by vulcanization. All substances that can react with rubber or make it cross-link are collectively referred to as vulcanizing agents, also known as cross-linking agents. There are many types of vulcanizing agents, and they are still increasing. The vulcanizing agents that have been used include sulfur, selenium, tellurium, sulfur-containing compounds, metal oxides, peroxides, resins, quinones and amines.

F. Material hardness: According to Shore hardness, the plastic parts can theoretically be selected between 10 degrees and 80 degrees in the domestic market. The ones that can be easily found are generally 20 to 70 degrees, and the commonly used ones are 40 to 50 degrees.