Materials and Construction
Which of the following is the most widely used insulating material for steam carray-ing pipelines?

Slag wool
Glass wool and 85% magnesia
Vermiculite
Ceramic fibre blanket

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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
Light and resists attack by acids
Relatively inexpensive although it can be fabricated with some difficulty
Highly corrosion resistant and is readily fabricated

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