There is a risk of mechanical and chemical damage to any instrument if not protected properly. Hence for almost all delicate gauge installations, we employ some sort of protective coating. Coating materials widely used are microcrystalline wax, plastic coating (liquid vinyls and flexible epoxy resin systems), silicones and synthetic rubber coatings. Wax coatings are not suited for instruments operating at high and low temperatures. Vinyl coatings are very much useful in cryogenic temperature range. Epoxy coatings have superlative features than vinyl coatings. Advantage of silicone coating is that at high temperature, it converts into harmless silica. Examples for synthetic rubber coatings are neoprene, polysulfide, butyl polymers etc.
No comments:
Post a Comment