Materials and Construction
The behaviour of visco-elastic material is time dependent. This behaviour is commo in __________ materials.

Rubberry
Crystalline
Non-crystalline organic polymeric
Non-crystalline solid

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

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

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