GENERAL ELECTRIC RTV142

RTV142 White, Low Volatile, One Component Silicone Sealant RTV142 one-component, ready-to-use adhesive sealant cures to a Product Description tough, durable, resilient silicone rubber on exposure to atmospheric moisture at room temperature. Methyl alcohol vapors are released from the sealant surface as a by-product of cure. These vapors have low odor and are non-corrosive to metals. An important property of RTV142 is its low volatility. RTV142 sealant has a thixotropic paste consistency. This allows it to be applied to vertical and overhead surfaces without sagging. Since it utilizes a moisture cure system, RTV142 sealant should not be used in thicknesses of greater than 6mm (ｼ inch). When section depths exceed 6mm (ｼ inch), GE Silicones one-component, addition cure or two-component silicone rubber compounds are suggested. • One-component product Key Performance • Room temperature cure Properties • Primerless adhesion to many substrates • Low odor • Non-corrosive to metals • Low volatility • Low temperature flexibility • High temperature performance • Excellent weatherability, ozone and chemical resistance • Excellent electrical insulation properties The non-corrosiveness to metals and low volatility of RTV142, as well Applications as its paste consistency, make it well suited for critical electronic adhesive, gasketing and sealing applications where a high level of volatile condensible materials cannot be tolerated. Typical Product Data Uncured Properties RTV142 Consistency Paste Color White Application Rate, g/min 975 Specific Gravity 1.09 Tack-Free Time, hours 4 (1) Cured Properties RTV142 Mechanical: 2 2 Tensile Strength, kg/cm (lb/in ) 38.5 (550) Percent Elongation 400 Hardness, Shore A 34 (5) Tear Strength, kg/cm (lb/in) 9 (50) 2 2 (2) Shear Strength, kg/cm (lb/in ) 21.0 (300) (3) Peel Strength, kg/cm (lb/in) 10.5 (60) (4) % Total Wt Loss 0.22 (5) Thermal: Continuous Operating Temperature -60 to 204 Range C (F) (-75 to 400) -4 Coefficient of Expansion, cm/cm, 2.7 x 10 -4 C (in/in, F) (1.5 x 10 ) Thermal Conductivity, W/mK 0.21 2 (cal/sec/cm , C/cm) (0.0005) (1) Cure time 10 days @ 25C (77F)/50% RH. (2) At 100% cohesive failure. (3) At 100% cohesive failure using 1 in. x 8 in. stainless steel screen at 180 degree pull angle. (4) Ball Aerospace VCM Test 33074. (5) Information is provided for customer convenience. These properties are not tested on a routine basis. Typical product data values should not be used as specifications. Specifications Assistance and recommendations are available by contacting GE Silicones at 800/255-8886. Surface Preparation Instructions for Use RTV142 sealant will bond to many clean surfaces without the aid of primers. These surfaces typically include many metals, glass, ceramic, silicone rubber and some rigid plastics. These adhesive sealant products may also produce acceptable bonds to organic rubber and to some flexible plastics not containing fugitive plasticizers (those that migrate to the surface, imparing adhesion). An evaluation should be made to determine whether acceptable bond strength develops for each specific application. For difficult-to-bond substrates, use of a primer is suggested. Primers SS4004, SS4044 and SS4179 are recommended for use with these sealants. (Complete information and usage instructions for these primer products are contained in a separate product data sheet #1532). Where adhesion is required, surfaces should be thoroughly cleaned with a suitable solvent such as naphtha or methyl ethyl ketone (MEK) to remove dirt, oil and grease. The surface should be wiped dry before applying the adhesive sealant. When solvents are used, proper safety precautions must be observed. Application and Cure Time Cycle RTV142 sealant can be applied directly to clean or primed substrates. Where broad surfaces are to be mated, the sealant should be applied in a thin, (less than ｼ inch ddiameter) diameter, bead or ribbon around the edge of the surface to be bonded. The cure process begins with the formation of a skin on the exposed surface of the sealant and progresses inward through the RTV. At 25 C(77F) and 50% relative humidity, RTV142 sealant will form a surface skin which is tack-free to the touch in 4 hours. Once the tack-free skin has begun to form, further tooling of the adhesive sealant is not advisable. Higher temperatures and humidity will accelerate the cure process: low temperatures and low humidity will slow the cure rate. Do not exceed 110F when curing materials. As the adhesive sealant cures, methyl alcohol vapors are released from the sealant surface. A 3mm (1/8 in.) section of adhesive sealant will cure through in approximately 48 hours at 25C (77F) and 50% R.H. Since cure time increases with thickness, use of these adhesive sealants should be limited to section thicknesses of 6mm (ｼ in.) or less. Bond Strength Development In addition to the effects of temperature and relative humidity, development of maximum bond strength will depend on joint configuration, degree of confinement, sealant thickness and substrate porosity. Normally, sufficient bond strength will develop in 48 hours to permit handling of parts. Minimum stress should be applied to the bonded joint until full adhesion is developed. Eventually the adhesive strength of the bond will exceed the cohesive strength of the silicone rubber adhesive sealant itself. Always allow maximum cure time available for best results. PACKAGING AND DISPENSING RTV142 adhesive sealant is supplied in 6 oz. (nominal size) SEMCO ｮ cartridges and is sold on a volume basis of 5.4 fluid ounces (160 ml) per cartridge. The SEMCO cartridge is designed for use with a hand or air-operated sealant gun manufactured by the SEMCO Company. Specific details on dispensing systems and manufacturers are available in a separate GE RTV Silicone Rubber Equipment Guide (1541). CLEAN UP AND REMOVAL Before curing, solvent systems such as naphtha or methyl ethyl ketone (MEK) are most effective. Refer to solvent use warnings in the section on surface preparation. After cure, selected chemical strippers which will remove the silicone rubber are available from the other manufacturers. Specific product information may be obtained on request from GE Silicones at 800/255-8886. SEMCO is a registered trademark of the SEMCO Company. These products are manufactured and sold for industrial use only Handling and Safety Material Safety Data Sheets are available upon request from GE Silicones. Similar information for solvents and other chemicals used with GE products should be obtained from your suppliers. Storage and Warranty When stored in the original unopened containers in a dry location at Period temperatures less than -18C (0F), RTV142 sealant offers a storage life of up to 4 months from date of shipment from GE Silicones. To help prevent curing of the unused portion of an opened container, reseal tightly. RTV142 silicone adhesive sealant may be ordered from GE Silicones, Availability Waterford, NY 12188, the GE Silicones sales office nearest you or an authorized GE silicone product distributor. 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