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RTV Silicone Rubber Room Temperature Vulcanizing Rubber

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RTV Silicone Rubber Room Temperature Vulcanizing Rubber For Electrical, Electronic and General Industrial Use RTV Silicone Rubber Room Temperature Vulcanizing Rubber Shin-Etsu Silicone’s electrical, electronic and general industrial use RTV silicone rubber, in liquid or paste form, has been developed primarily for the gluing, sealing, and potting of electrical and electronic equipment. As electrical and electronic equipment becomes smaller, lighter, and more sophisticated, ever higher quality and performance is required of their structural components and materials. Shin-Etsu Silicone’s high-performance RTV silicone rubber products can meet a wide variety of needs, offering outstanding heat and low-temperature resistance, weather resistance, and electrical properties. Our wide range of products contributes to increased reliability of electrical and electronic equipment and communications equipment. Contents Features of RTV Silicone Rubber 3 Selection Guide 4 Performance Characteristics ■ Curing properties 6 ■ Adhesion 8 ■ Electrical properties ■ Heat resistance 10 ■ Weather resistance / Durability 11 ■ Chemical resistance 12 ■ Low-molecular-weight siloxane 13 ■ Various additives 14 ■ Primers 15 Product Listing by Intended Use 16 Product List ■ Sealing – General industrial purpose 18 ■ Sealing – General electrical purpose (one-component) 18·19 RTV stands for Room Temperature Vulcanizing. ■ Sealing – General electrical purpose (two-component) 19 ■ Sealing – Reduced low-molecular-weight siloxane types 20 RTV silicone rubber changes from a liquid state ■ Potting (rubber) 22 to a solid (or elastic body) by a variety of curing methods. ■ Potting (gel) 23 Our lineup features Shin-Etsu’s original products of ■ Coating ■ Thermally conductive types 24 ■ Foams ■ Oil- and solvent-resistant types (fluorosilicone) 25 different viscosities, with various distinctive properties. ■ Primers ■ Curing agents 26 You can choose products that meet the needs of ■Diluents, additives, and coatings ■UL listing 27 your specific application. Packaging and Colors ■ One-component RTV silicone rubber (room temperature curing types) 28 ■ One-component RTV silicone rubber (heat cure types) 29 ■ Two-component RTV silicone rubber (room temperature curing and heat cure types) Directions for Usage ■ One-component RTV silicone rubber - Usage 30 ■ Two-component RTV silicone rubber - Usage Handling Precautions 31 Features of RTV Silicone Rubber Heat and cold resistance Shock resistance Suitable for heat-resistant seals of heating devices For applications such as vibration insulation of 1 such as microwave ovens. 5 optical pickups. They can be used at tempera- After curing, they absorb tures ranging from -50°C to shock and vibration, which +250°C. They remain flexible prevents damage to electrical even when used continuously and electronic components, from -40°C to +180°C. glass, and other delicate objects. Oil and chemical resistance Adhesion For sealing and potting of equipment and sensors Suitable for heat-dissipating seals of heat pipes. 2 6 for automotive use. They exhibit outstanding Resistance to chemicals and adhesive strength on oils is far better than that of numerous materials including organic rubber. Products metals, glass, and plastics. include gasoline-resistant and There are types available that engine-oil-resistant formula- suit a variety of different tions. applications, substrates, and usage conditions. For certain substrates, the use of a primer is recommended. Electrical properties For moisture-proof coating of electrodes and Weather resistance For sealing equipment used outdoors. 3 other applications. 7 Their ability to maintain stable With superior resistance to electrical properties even ultraviolet rays, ozone and through environmental water, these products can be changes such as temperature exposed to outdoor conditions and humidity changes makes for long periods of time them ideal for insulation resulting in little if any deterio- sealing applications in ration. electrical and electronic equipment. Non-solvent formulations Waterproof and airtight 4 For coating various substrates. 8 Suitable for sealing various household ceramics. Non-solvent adhesives and After curing these products coating agents are available. exhibit outstanding waterproof (There are also solvent types and airtight performance. They available.) are ideal for sealing electronic parts and equipment that are vulnerable to moisture, and for sealing in the bathroom, kitchen, or wherever water is used. 3 Selection Guide Shown below are RTV siliconce rubbers of different reaction types, Types of curing each with distinctive characteristics. reactions Curing reaction types and characteristics of RTV silicone rubbers Curing reaction Characteristics Generated gas RTV classification Handling classification The curing reaction begins upon exposure Acetone Acetone type to atmospheric moisture. Small quantities of gases are generated during curing. Alcohol Alcohol type Condensation reaction Room-temperature curing type Oxime*2 Oxime type Shrinkage (weight): about 4% Acetic acid Acetic acid type Heating will accelerate the curing process with Heat curing type Addition reaction None Addition type almost no curing shrinkage. Room-temperature curing type UV reaction *1 Cures rapidly through exposure to UV rays. None UV type — *1 UV cure products require detailed explanation, so please contact the nearest Shin-Etsu Sales Department directly. *2 Oxime gas: MEKO (Methyl ethyl ketoxime) Characteristics Brief description Reaction type Cure speed Anti-corrosiveness free Tack Storability Hermetic heat resistance Acetone type Non-corrosive and quick-drying, with excellent hermetic heat resistance Alcohol type Low corrosiveness and low odor with excellent stress crack characteristics Oxime type Oxime generated during curing is corrosive to copper Acetic acid type Strong odor and metal corrosion due to generated acetic acid gas during curing Addition type — — Rapid curing and strong adhesion by heat-curing (one-component) Addition type — — Both heat-curing and room-temperature-curing types are available (two-component) ● Hermetic heat resistance: the heat resistant stability of the uncured product when stored hermetically. ● Stress cracks: cracks which occur when plastic or other materials under strain come in contact with adhesives containing solvents, etc. : excellent : good : fair : poor — : n/a ● Viscosity before curing Viscosity Generally speaking, RTV silicone rubber products start as a liquid and and workability cure to become an elastic body. The viscosity values listed in this catalog should provide a guideline as to workability. Flowable, low viscosity products are suitable for potting and coating. Medium viscosity products and non-flowable high viscosity products (paste consistency) are suitable for sealing and adhesion or fastening of parts. Low viscosity Med. viscosity High viscosity 0.01 Pa·s 1 Pa·s 100 Pa·s 1,000 Pa·s 10 mPa·s 100 mPa·s 1,000 mPa·s 10,000 mPa·s Potting, coating Sealing, adhesion/fastening 4 Selection Guide RTV silicone rubbers each have their respective workability and storability characteristics, One-component Two-component and are divided into one-component and two-component types. type type Types of RTV silicone rubber • Advantages: Fewer curing problems, easy to handle. No need to heat or blend. Room temperature cure One-component condensation cure • Disadvantages: Deep sections are slow to cure. Difficult to control curing speed. • Advantages: Cure quickly with application of heat. Better deep-section cure properties. Heat-cure One-component addition cure • Disadvantages: Susceptible to cure inhibitors. One-component type Must be kept at 10°C or below. • Advantages: Can be used in spots where heating is not possible. Room temperature cure Two-component condensation cure • Disadvantages: Takes longer to cure completely than addition-cure types. RTV silicone rubber • Advantages: Good deep-section cure properties, Two-component addition cure and can be heat-cured. • Disadvantages: Susceptible to cure inhibitors. Two-component type • Advantages: Shorter cure times are possible. Heat-cure Two-component addition cure Good deep-section cure properties. • Disadvantages: Susceptible to cure inhibitors. One-component type Two-component type Parameter Room-temperature-curing type Heat-curing type Room-temperature-curing type Heat-curing type Blending Unnecessary Unnecessary Required Required Deaeration*1 Unnecessary Unnecessary Required Required Deep-curing Inferior Excellent Excellent*2 Excellent Cure speed regulation Impossible Impossible Possible Possible Accelerated curing Impossible Heating Impossible Heating Storability Airtight, room-temperature storage Refrigeration required Room-temperature storage Room-temperature storage *1 Deaeration: the process of allowing a substance to stand, or degassing to remove interfused air bubbles that may degrade dielectric properties. *2 Please refer to the handling precautions on page 31. General properties of silicone rubber (comparison) Comparison [Coefficient of linear expansion / Tensile modulus of elasticity] with other resins Coefficient of linear expansion Tensile modulus of elasticity ppm/°C N/mm2 Silicone 2-4×10-4 0.01-20 Epoxy 5-8×10-5 2,000-5,000 Polyurethane 10-20×10-5 70-3,000 Acrylic 10-20×10-5 (Room temperature: 23°C) 5 Performance Characteristics ■ Curing properties The required curing time for one-component condensation cure type RTV silicone rubber is dependent on the thickness of the rubber, the air temperature, and the relative humidity. Curing begins on the surface,
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