Hunan noli enamel co., ltd is the leader manufacturer of enamel frits & inorganic pigment in china. now we have 30,000 m/t enamel frits and 2,000 m/t inorganic pigments annual capacity, and 10,000 m/t rtu(ready to use) powder and electro static powder. It is a anti-acid industrial enamel cover coat frit, very strong acid resistance, corrosion resistance, specially for enamel reactor. industrial enamel grount coat frit it is a anti-acid industrial enamel ground coat frit, very strong acid resistance, corrosion resistance, specially for enamel reactor. Us2321763aporcelain enamel ground coatgoogle patents porcelain enamel ground coat download pdf info publication number us2321763a ... frit slip fineness frits mesh screen prior art date 1939-05-09 legal status (the legal status is an assumption and is not a legal conclusion. google has not performed a legal analysis and makes no ... Feb 24, 2015u00a0u00b7 field of the invention. the present invention provides enamel compositions and ground coat compositions. more particularly, the present invention provides compositions for use in forming an acid resistant and chip resistant enamel cover coating from which baked-on foods can be removed without the need for pyrolysis or highly alkaline cleaners.