The Manufacturing Process of Vitreous Enamelled Products.
The raw materials, borax, silica, cobalt, nickel, titanium and others, are smelted together in a kiln at approximately 1200ºC for four hours and immediately on removal from the kiln rapidly cooled using cold water. The shock shatters the molten mixture into fine particles called 'frit'.
Along with water the frit and other materials (including clay and colouring pigments) are milled in ceramic-lined ball mills to a cream-like consistency called 'slip'. The slip is then ready for direct application, via a wet spray process, onto the metal surface that has been prepared for enamelling.
Enamelled steel signs