... ,we can do all kinds of tests by ourselves including LOAD-BEARING TESTING(conform to EN124), SALT SPRAY TEST,CHEMICAL ANALYSIS TEST ... good porcelain enamel resistance.For example:Thermal shock test, Fire testing,Impact test and salt spraying Cast iron grate, cast iron ... all kinds of product test including:Fire testing(1 hour *3 times)Thermal shock testing(350°C*30mins*3times)Impact test (5lbs ...