Materials and Construction
Lead pipe is

All of these
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)

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Materials and Construction
Hastelloy C is a good material of construction in chemical process industry, since it is

Highly corrosion resistant and is readily fabricated
Light and resists attack by acids
Relatively inexpensive although it can be fabricated with some difficulty
Corrosion resistant to most alkalis, particularly because of its coper content

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