Process for making a chemically-resistant porcelain enamel

Coating processes – With post-treatment of coating or coating material – Heating or drying

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4274194, 4274196, B05D 302

Patent

active

053874390

ABSTRACT:
A process for preparing a chemically resistant coating in which a substrate is sequentially contacted with a ground coat, fired, contacted with an intermediate coat, fired, and contacted with a cover coat and fired. The intermediate coat is comprised of a minor amount of inorganic fiber which has a softening point in excess of 950 degrees Centigrade, an average length of from about 100 to about 750 microns, an average diameter of from about 515 microns, and an average aspect ratio of from about 10:1 to about 75:1.

REFERENCES:
patent: 2563502 (1951-08-01), Sweo
patent: 4407868 (1983-10-01), Iizawa
patent: 4975391 (1990-12-01), Shimizu et al.

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