Alibaba offers 270 glass enamel frits products. about 31% of these are ceramics, 31% are building glass, and 29% are other inorganic chemicals. a wide variety of glass enamel frits options are available to you, such as clear glass, tempered glass. Astm's paint and related coating standards are instrumental in specifying and evaluating the physical and chemical properties of various paints and coatings that are applied to certain bulk materials to improve their surface properties. Bathtubs produced from metal have a base of either cast iron or steel. the base metal is then coated with a vitreous enamel. vitreous enamel, or just enamel (or porcelain enamel in u.s. english), is a material made by fusing powdered glass to a substrate by firing, usually between 750 and 850 degrees celsius (1380 and 1560 degrees fahrenheit). Industrial enamel application editar. on sheet steel, a ground coat layer is put on first to create adhesion. the only surface preparation required for modern ground coats is a simply degreasing of the steel with a mildly alkaline solution. white and colored second cover coats of enamel are applied over the fired ground coat.