9161, 5KG

Product Information SILASTIC 9161 RTV Silicone Elastomer FEATURES Low viscosity silicone elastomer Room temperature cure Usable at temperatures from APPLICATION -50C to +250C Applications include encapsulation of electronic components, potting of Excellent dielectric properties electromagnets and coating of electronic circuits. Highly resistant to moisture, oxidation and weathering TYPICAL PROPERTIES Easy to pour Specification writers: These values are not intended for use in preparing specifications. Please contact your local DowCorning sales representative prior to writing specifications Flexible pot life depending on on this product. catalyst concentration CTM* ASTM* Parameter Unit Value As supplied - base 0176 Colour Off white 0050 D455 Viscosity at 25C mPa.s 13,000 0097 D792 Relative density at 25C 1.60 As supplied - N9162 catalyst 0176 Colour Light yellow 0022 D792 Relative density at 25C 1.01 Mixing ratio by weight Physical properties, cured with 2% N9162 Catalyst for 24 hours at 20C 0099 D676 Durometer hardness Shore A 39 0137A D412 Tensile strength MPa 2.75 0137A D412 Elongation % 250 0159A Tear strength kN/m 2.2 Linear shrinkage, 24 hours at 70C % 1.0 Thermal conductivity W/(m.K) 0.25 Electrical properties, cured with 2% N9162 Catalyst for 24 hours at 20C 0114 D149 Dielectric strength kV/mm 21.5 0112 D150 Permittivity at 1MHz 4.01 0112 D150 Dissipation factor at 1MHz 0.0072 0249 D257 Volume resistivity ohm.cm 3.0 x 10 * CTM: Corporate Test Method, copies of CTMs are available on request. ASTM: American Society for Testing and Materials. For optimum adhesion, coat surfaces HOW TO USE with DOWCORNING 1200 Primer Substrate preparation (see Handling Precautions). For best adhesion, clean and degrease application surfaces using solvents Mixing (see Handling Precautions). Remove The pot life of the catalysed material all solvent and ensure all surfaces are depends on the concentration of dry before applying the product. DOWCORNING N9162 Catalyst and the temperature. The catalyst (see step wise cure. No problems are prolonged breathing of vapours and Handling Precautions) should be experienced with normal open air heat prolonged or repeated skin contact. measured by weighing and can be ageing. The effect of heat ageing on effectively dispersed by simple hand SILASTIC 9161 RTV at various When using solvents avoid heat, or mechanical stirring. A clean paper temperatures is shown in Table I. sparks and open flame. Always cup, metal, glass or plastic container provide adequate ventilation. Obtain can be used for the mixing operation. and follow handling precautions from Addition of Catalysed SILASTIC 9161RTV will the solvent supplier. DOWCORNING normally de-air itself on standing. 200/20mm/s Silicone Fluid However, for encapsulating intricate PRODUCT SAFETY It is possible to add up to 20 parts by components, vacuum degassing is INFORMATION REQUIRED FOR weight of DOWCORNING recommended and a residual pressure SAFE USE IS NOT INCLUDED. 200/20mm/s Dimethyl Silicone Fluid of 10mm to 20mm of mercury will BEFORE HANDLING, READ to SILASTIC 9161 RTV to obtain the sufficiently de-air the material in 10 PRODUCT AND SAFETY DATA following effects: minutes. SHEETS AND CONTAINER LABELS FOR SAFE USE, - reduced hardness Typical pot life at 25C PHYSICAL AND HEALTH - lower mixed viscosity HAZARD INFORMATION. THE % by weight of DOWCORNING N9162 - increased pot life Catalyst added to SILASTIC9161 RTV SAFETY DATA SHEET IS AVAILABLE FROM YOUR LOCAL Pot life (minutes) The physical strength of SILASTIC DOWCORNING SALES 1.0 35 9161 RTV is reduced, but this is often REPRESENTATIVE. 1.5 25 acceptable in potting applications 2.0 12 where protection is given by the outer USABLE LIFE AND 3.0 7 casing. 4.0 3 STORAGE Pot life is the time taken for the catalysed When stored at or below 32C in the Reducing the setting time material to double its initial viscosity original unopened containers, this It is sometimes required that the product has a usable life of 12 months elastomer should be in a handleable from the date of production. How to apply condition as soon as possible after Being careful to minimise air using. In such cases, the setting time* DOWCORNING N9162 Catalyst is entrapment, apply the encapsulant. can be reduced by heat curing the very easily hydrolysed by Vacuum encapsulation is catalysed elastomer. A maximum atmospheric moisture and it is recommended for complex temperature of 80C is recommended essential that it should be kept out of geometries. since there is no significant advantage contact with water and water vapour. to be gained by going above this point It is, therefore, important that the lid For information on appropriate and there is a risk of bubbling. Figure of the catalyst container is replaced dispensing equipment for your 1 shows the typical effect of immediately after use. If application, please contact temperature on the setting time of DOWCORNING N9162 Catalyst is DowCorning. SILASTIC 9161 RTV. stored at 8C or below, it may haze or solidify. In this event it should be * Setting time is the time required for Heat ageing warmed gently to 20C until all the SILASTIC 9161 RTV to reach a SILASTIC 9161 RTVexhibits material liquifies. DOWCORNING rubber like state when it can be excellent heat ageing characteristics at N9162 Catalyst should not be used in handled. temperatures up to 250C. In totally the non homogeneous state. confined conditions, SILASTIC 9161 RTV may depolymerise at elevated PACKAGING temperatures. To minimise this effect, This product is available in 0.5kg, 5kg HANDLING PRECAUTIONS components which must operate in and 20kg containers, net weight. total confinement at elevated DOWCORNING N9162 Catalyst is flammable and contact with sources temperatures should be given a step DOWCORNING N9162 Catalyst is wise post cure of approximately 25C of ignition should be avoided. Skin available in 0.5kg and 5kg containers. and eye contact should also be per hour in an open container. A final cure of 4 hours at 25C above the avoided. Splashes should be washed first with alcohol and then soap and LIMITATIONS maximum operating temperature of the device is recommended. water. This product is neither tested nor represented as suitable for medical or SILASTIC 9161 RTV shows less DOWCORNING 1200 Primer is pharmaceutical uses. depolymerisation or reversion than flammable. Keep away from heat, most other condensation curing two sparks and open flames. Use only component RTV s, even without a with adequate ventilation. Avoid 2 Ref. no. 61-0179D-01