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A brushed-on coating that penetrates the MgO, offering economical moisture protection under humid storage conditions./
RTV (room temperature vulcanizing) silicone rubber adhesive sealant provides a good moisture seal.
Epoxy resin provides a moisture resisting barrier.
This type seal is used primarily for defrost heaters.
Ceramic to metal seals provide an airtight seal for temperatures to 500°F (260°C) in the seal area.