Materials and Construction
Containers made of high silicon cast iron (14% Si) are not suitable for the storage of

Acetic acid
Phosphoric acid (95%) & sulphuric acid (95%)
Benzoic & boric acids
Hydrochloric acid (concentrated)

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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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