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Epoxy Edge Sealing - The New Standard in Moisture Protection In many applications it is necessary to protect thermoelectric cooling modules from moisture infiltration to prevent degradation in performance or catastrophic failure of the module due to junction corrosion or electrical short. Until recently the typical protection has been a bead of silicon-based sealant such as RTV around the perimeter of the module. While RTV will keep droplets out, water vapor can penetrate the material and become trapped inside a thermoelectric cooler. We now have an "aircraft grade" epoxy alternative to RTV - with much lower vapor permeability. The dielectric, mechanical and physical properties of the two sealant types follow: PROPERTIES SILICON RTV EPOXY Technology one-component TRV rubber Two-component RTC rubber Viscosity Thixotropic Non-slumping Thixotropic Non-slumping Color White Amber Hardness, Shore A 40 80 Elongation, % 300 90 Adhesive strength to Al2 O3 ceramics kg/cm² 20 40 Coefficient of thermal conductivity, W/mºK 0.21 0.1280 Volume resistance, Ohm·cm 3·1014th 1·1015th Dielectric strength, KV/mm 25 17 Dielectric Constant at 1 MHz 2.9 3.1 Dissipation factor at 1 MHz 3·10-3rd 1·10-2nd Shrinkage, % 6.0 0.4 Operating temperature, ºC -40 + 180 -50 + 200 Note: TE Modules manufactured with an Epoxy perimeter seal are designated with an "E" suffix (for example: ST-127-1.4-6.0"E"). We are delighted to offer you superior Epoxy sealant for the same low price as RTV. For additional protection, consider our anti-corrosion "potting" material. Additional information that may be important to you may include: Module Specifications Module Prices Anti-Corrosion Potting Installation Instructions TEC Reliability If you have a question please feel free to contact us:

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