It is a stable quality porcelain enamel frit, one coat one fire, can be applied to enamel cookware / gas stove / bbq. acid resistance black frit it is a high quality acid resistance black frit, one coat one fire, can be applied to enamel cookware / gas stove / bbq. Alibaba offers 601 cover coat enamel frits products. about 84% of these are other inorganic chemicals, 1% are ceramics, and 1% are pigment. a wide variety of cover coat enamel frits options are available to you, such as industrial grade, food grade. Mar 12, 2018 · enamel cookware often has a cast iron base that's coated in a substance called vitreous enamel. vitreous enamel is made by fusing melted glass to metal at a very high temperature. this smooth coating protects the metal underlying your cookware. in many cases, the enamel chips over years of use or as a result of improper care. 2, can be combined with cover coat in high level. 3, with very good elasticity and compressive strength. prevent and decrease damage due to mechanical stress. 4, with less viscosity and surface tension, it’s good for escape of gas when firing. reduce bubbles on cover coat. to ensure the smooth surface of enamel products.