For grooved pipe fittings, due to the particularity of its material, cast iron is basically used at present, so anti-rust treatment is very critical. We will briefly introduce the relatively skilled craftsmanship used by many pipe fittings manufacturers.  

    1. Spray painting, this process has been used for a long time, and at present, 30% of enterprises are still using it.  

    2. Spraying, due to the many defects in the spraying process, since 2008, many grooved pipe fittings companies have begun to use the spraying process for rust prevention.