Equipment for quality testing： Purity testing of zinc ingot and zinc liquid： 　　　　　spectral analysis equipment　　　　　　　　　 　　　　　　　Torch 0# Zinc Testing of chemical liquid for galvanizing process： 　　During the galvanizing process, the chroma of acid and other assistant galvanized liquid is changing all the time. In order to control the proper chroma, they should be tested every 8 hours for chroma analysis, in the results of it, the components could be galvanized well. Testing of passivation liquid： 　　Passivation groove 　　We have the only passivation techniques in galvanizing at home, and after passivation, an oxidation film forms on the surface of cable tray, in this case, the oxidation could be prevented effectively, and the zinc would be rusted very slowly, and also no white floating rust appears. It is ensured that our cable tray could be used as long as 40 years with the help of this technique. We analyze the purity of the passivation termly to ensure the effective purity of the passivation liquid. Testing of thickness and continuity of zinc coating： 　　We estimate the using life of our products according as thickness of zinc coating mainly. It is recognized worldwide that not only normal magnetism testing for thickness of zinc coating but also chemical testing for samples random. 　　To use the bluestone testing, ensure enough dip time and no red spots appear. Sampling methods: random, qualified rating must be keep at 100%.