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Whether the floor sanding surface is smooth, whether there is bulging particles, and whether the cork particles are pure.
Second, whether the length of the floor is straight or not is obtained by taking four identical floors, laying them on a glass plate, or on a relatively flat ground, and assembling them to see whether they meet each other.
Three test board bending strength, the method is to close the two diagonals of the floor, see if the curved surface cracks, no quality products.
Four bonding strength test: Put a small sample into open blisters, and found that the smooth surface of its sanding becomes suede-like, uneven surface, this product is unqualified product, quality product should not change significantly in case of boiling water .
Five-density selection: density is divided into three levels, the average family is 400-500kg/m3.
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