The procedure of shell making goes as follows:
1. Immerse the cluster of wax moulds into the surface coating paint;
2. Lift the cluster, wrap with quartz sand with diameter 40-70 meshes and submerge it in the induration water consisting of Ammonium Chloride for 10-20 minutes;
3. Hang it for drying for about 40 minutes;
4. Immerse it into the reinforce coating paint;
5. Wrap it with rough sand with diameter 20-40 meshes and submerge it in the induration water made of Magnesium Chloride for more than 50 minut
آی-ویدئو