The use of porcelain enamel as a decorative finish is briefly discussed as contrasted to its more recent use as a corrosion resistant coating. The properties of different types of enamels are enumerated as regards methods of application and resistance to acid, weather, water, inorganic salts and other chemicals. Some specific applications for corrosion resistance are discussed which include hot water storage tanks, housings for airplane and tank engine exhaust systems, glass-lined pipe for natural gas containing hydrogen sulfide, chemical process equipment, and street or advertising signs. Resistance to impact damage is also discussed.

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