... from an excess of electric current. Also used in airproof equipment.Melt: It melts under excessive current conditions, protecting the circuit from ... , Gas Purpose,Telephones, Telegraph, Under ground works, Acids & Chemicals. In present time, Lead Pipes are mainly used for carriage of ... crafts and Lead sinkers for diving etc.2. Main materialMainly using the Lead,Tin and Zinc etc.3. Technology and ...