By the weight of copper head

By over all size of the head

By geometry of the head

By the length of the head

Lump, powder, paste or liquid

Solid, liquid, powder

Gas, solid, paste

Semi solid, gas, liquid

182 Degree Centigrade

183 Degree Centigrade

184 Degree Centigrade

185 Degree Centigrade

Zinc chloride

Phosphoric acid

Ammonium chloride

Hydro chloric acid

50%, 40%, 10%

60%, 30%, 10%

70%, 20%, 10%

80%, 20%, NiL