Materials and Construction
Visco-elastic behaviour of materials which is time dependent is common in

Plastics
Non-crystalline organic polymer
Crystalline solid
Non-crystalline solids

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Materials and Construction
Lead pipe is

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

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