Plate and frame filter press is usually made of__________________?
Correct answer: B. Cast iron
- A. Mild steel
- B. Cast iron
- C. Stainless steel
- D. Galvanised iron
Explanation
Traditional plate-and-frame filter presses use cast-iron plates and frames because cast iron is rigid, strong, and economical. Stainless steel versions are chosen for corrosive, hygienic, or high-purity applications, but are not the usual general-purpose construction.
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