The addition of RTV silicone rubber is a colorless or yellowish transparent oily liquid, which becomes soft and transparent silicone gel after vulcanization. This gel can maintain elasticity in the temperature range of -65 to 200 degrees Celsius. It has excellent electrical and chemical stability, water resistance, ozone resistance, weathering resistance, water repellency, moisture resistance, shockproof and non corrosive. It also has the advantages of physiological inertness, non-toxic, tasteless, easy to pour, deep vulcanization, low linear shrinkage and simple operation. Silicone gel is widely used in the electronics industry as moistureproof, smuggling, insulation coating and potting materials for electronic components. It has dust-proof, moisture-proof, shockproof and insulation protection for electronic components and assemblies. If transparent gel is used to encapsulate electronic components, it can not only play a role of shockproof and waterproof protection, but also can see components and detects the malfunction of components by using probes, and the damaged silicone gel can be re filled and repaired again.
Because of its high purity, convenience and flexibility, silicone gel is an ideal coating material for transistors and integrated circuits, which can improve the pass rate and reliability of semiconductor devices. Silicone gel can also be used as an elastic adhesive for optical instruments.
In medical treatment, silicone gel can be used as an organ for human body, such as artificial breast, and used to repair damaged organs.
Foam silicone rubber foam silicone rubber is a porous sponge like elastomer, which is formed by condensation of hydroxyl terminated silicon raw rubber, hydroxyl hydrogen silicone oil as foaming agent and vinyl platinum complex as catalyst (heating catalyst for two butyl two lauric acid tin), and foaming at room temperature. In order to improve the quality of foam, some other components, such as silicone oil, should be added to produce more gas during the vulcanization process. The addition of two phenyl siloxane can not only control the structure of the foam, but also control the viscosity of the rubber during storage, but it can not be used too much, otherwise it will affect the electrical properties of the foam. In order to improve the physical and mechanical properties of the foam, transparent silicone rubber can also be added. The amount of vinyl complex of the catalyst chloro platinic acid can not be too much, and the operation is convenient. Otherwise, the viscosity will increase, which will not be beneficial to the operation. When the amount of catalyst is insufficient, the vulcanization is incomplete, the surface of the foam is sticky, elastic is not good, soft and plastic, and the strength is poor.
Foam silicone rubber is liquid before vulcanization and suitable for potting material. The foam after vulcanization can be used for a long time at -60~159 C, and after 150 or 72 hours aging or 60 to ten 70 C ten times, the foam remains the same. Foam silicone rubber is an ideal lightweight material because of its high thermal stability, good heat insulation, insulation, moisture resistance and shock resistance, especially in high frequency. It is used for "Three Prevention" protection. In addition, it can also be used as filling material of thermal insulation interlayer, floating material and sealing material in salt fog atmosphere. Foam silicone rubber can also be used as a filling, repairing and material for orthopedic surgery in medicine. In order to meet the fire protection requirements of transmission lines, the American anti Corelle company has developed a flame retardant RTV foam silicone rubber DC3-6548. The foam silicone rubber is mainly used for fireproofing and sealing of wires and cables passing through holes (such as roofs, walls, buildings, etc.). Its flame retardancy is very good. Its limit oxygen index reaches 39 (most plastic limit oxygen index is only 20), and its service life is as long as 50 years. At present, the flame-retardant room temperature vulcanized foam silicone rubber has been widely used in nuclear power plants, electronic computer centers, offshore oil extraction devices and other harsh environmental conditions, or places with high fire safety requirements.