Building Materials
The cast iron when heated to red heat with powdered red haematite in an oven for increasing its toughness, is converted to

Grey cast iron
Mottled cast iron
Toughed cast iron
White cast iron

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Building Materials
The plywood

Has good strength along the panel only
Cannot be bent more easily than ordinary wood of same thickness
Can be spilt in the plane of the panel
Has greater impact resistance to blows than ordinary wood

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