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Cushion formwork per square weight
About 20 kilograms.

Pad is basically used in double-layer two-way slab and shear wall, mainly to ensure the spacing between two layers of steel mesh, and stirrup and S-shaped hook play the same role. Stone formwork is needed under the steel bar, so that the concrete can wrap all the steel bars inside. If you put the steel bar directly in the soil, it will rust and rot.