Materials and Construction
Thermosetting resins are those polymers, which

Do not take on a permanent set
Do not increase in plasticity with rise in temperature
None of these
Allow slip to occur between molecules

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Materials and Construction
Lead pipe is

Especially resistant to solutions containing H₂SO₄
Having very low elastic limit resulting in permanent deformation from either mechanical or thermal strain
Usually joined by burning (e.g. by melting to adjacent pieces with a torch)
All of these

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