1.

What is the density of the plastic used in speed tip welding?(a) 916 kg/m^3(b) 923 kg/m^3(c) 946 kg/m^3(d) 982 kg/m^3

Answer» The correct option is (c) 946 kg/m^3

Explanation: The plastic which is used in the process of speed tip welding is polypropylene or polypropene. It is classified under thermoplastics materials. The density of polypropylene is 946 kg/m^3 and it starts melting at 130°C.


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