Supplying, Providing and Laying 75mm thick i.e. in 1 layers of 75 mm, REFRACTORY INSULATING BRICK of approved make of size 230 mm x 115 mm x 75 mm., Providing and Laying 150 mm thick i.e. in 2 layers of 75 mm each, Providing and Laying 225 mm thick i.e. in 3 layers of 75 mm each, REFRACTORY FIRE BRICK of approved make of size 230 mm x 115 mm x 75 mm.
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