Room temperature vulcanized silicone rubber generally includes two categories: condensation type and addition type. Additive room temperature adhesive is based on linear polydimethylsiloxane with vinyl groups as the base adhesive, and uses hydrogen containing siloxane as the crosslinking agent. It undergoes crosslinking reaction in the presence of a catalyst at room temperature to medium temperature to become an elastomer. It has good heat resistance, hydrophobicity, and electrical insulation properties. At the same time, due to the introduction of active end groups, it has excellent physical and mechanical properties, especially in terms of tensile strength, relative elongation, and tear strength, which have been significantly improved. It is suitable for various vulcanization methods, such as radiation vulcanization, peroxide vulcanization, and addition vulcanization, and is widely used in heat resistance, moisture resistance, electrical insulation, high-strength silicone rubber products, and other fields.

Condensation type room temperature vulcanized silicone rubber is characterized by the condensation reaction between silicon hydroxyl groups and other active substances, which can crosslink into elastomers at room temperature. The product is divided into two forms: single component packaging and two-component packaging. One component room temperature vulcanized silicone rubber (RTV-1 rubber) is one of the main products in condensed liquid silicone rubber. It is usually formulated from basic polymers, crosslinking agents, catalysts, fillers, and additives. The product is packaged in a sealed hose, extruded during use, and can self vulcanize into an elastic material upon contact with air, making it extremely convenient to use. Vulcanized rubber can be used for a long time in the temperature range of (-60~+200 ℃), with excellent electrical insulation performance and chemical stability. It is resistant to water, ozone, and weather aging, and has good adhesion to various metal and non-metal materials. Mainly used for coating various electronic components and electrical equipment, as well as encapsulation materials for insulation, moisture resistance, and shock resistance; As a surface protective material for semiconductor devices; It can also be used as a sealing filler and elastic adhesive.

Two component room temperature vulcanized silicone rubber (referred to as RTV-2 rubber) is not as convenient to use as RTV-1 rubber, but its composition ratio is rich in variation. One variety can obtain vulcanized products with multiple specifications and properties, and it can also be deeply vulcanized. Therefore, it is widely used in industries such as electronics, electronics, automobiles, machinery, construction, textiles, chemicals, light industry, printing, etc. as insulation, packaging, jointing, sealing, moisture-proof, earthquake resistant, and material for making rollers. In addition, due to its excellent demolding properties, RTV-2 is widely used as a soft mold material for the replication and manufacturing of cultural relics, handicrafts, toys, electronic appliances, mechanical parts, and more.

One of the typical applications of silicone sealant is glass curtain walls. Use organic silicon structural adhesive to bond glass and aluminum alloy frames as exterior wall materials, and use organic silicon weather resistant adhesive for waterproof sealing of expansion joints. Other applications include peripheral sealing for aluminum alloy doors and windows and plastic steel doors and windows, sealing of glass installation and moving grooves, sealing of rivets and fixing screws, and waterproof sealing between sanitary ware and countertops, walls, and furniture in kitchens, bathrooms, and washrooms; Sealing of aquariums, canopies, metal roofs, shop windows, counters, wall panels, and colored steel plates; Used for waterproof joint sealing between high-grade highway sections.

In addition to building sealants, RTV also includes sealing materials used in industries such as aerospace, nuclear power plants, electronics, machinery, and automobiles, organic silicon sealing materials used for electronic component sealing, and organic silicon mold adhesives used as soft mold materials. The demand for these varieties is relatively low, but they are essential in many situations.


High viscosity linear hydroxyl-terminated polydimethylsiloxane ,plz check MY 107V150000-V550000