What is HTV High-Temperature Silicone Rubber?
HTV High-Temperature Vulcanizing (HTV) silicone rubber is a type of silicone elastomer that is synthesized using high molecular weight linear polydimethylsiloxane (or methylvinyl, methylphenylvinyl, or trifluoropropyl) as the base polymer. It is mixed with reinforcing fillers and curing agents (organosilicon compounds) and then vulcanized under heat and pressure to form an elastic material.
HTV high-temperature silicone rubber exhibits excellent properties, including:
1. Excellent high and low-temperature resistance, allowing for long-term use within the range of -60°C to 250°C.
2. Non-toxic and physiologically inert.
3. Outstanding electrical insulation properties, maintaining consistent electrical performance within a wide temperature and frequency range. It also possesses excellent resistance to arc tracking and corona discharge. When conductive fillers are added, it exhibits excellent conductivity.
4. Superior resistance to ozone and weathering aging. Certain varieties, such as high-phenyl-content high-temperature vulcanizing silicone rubber, also exhibit excellent resistance to radiation.
5. Excellent surface characteristics: anti-adhesive and sulfur resistance. Special varieties, such as fluorosilicone rubber, also demonstrate excellent resistance to oil and solvents.
6. Good breathability with selective permeability. Unlike other organic synthetic rubbers, pure silicone rubber has low strength and requires the addition of reinforcing fillers, curing agents, structural control agents, and other additives. Once uniformly mixed and processed into compound silicone rubber, it can be processed using conventional rubber processing methods such as molding, extrusion, and calendaring. Under heating and pressurizing conditions, it can be formed into various silicone rubber products. The properties of these vulcanized silicone rubber products are not only related to the raw rubber structure and properties but also greatly influenced by the formulation of the compound silicone rubber, mixing equipment and process, and processing techniques.
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