Plywood purchasing tips and precautions:
The adjacent layers of ordinary plywood have wood grain which is "vertical" to each other, and the number of layers is odd. The grades are classified into four grades: special grade, first grade, second grade, and third grade. The appearance of the plywood should be smooth and smooth, and the glue layer should not have bubbling or delamination. Avoid selecting the panel splicing seams, laminations and core panels. Plywood larger than 6 mm should also judge whether the warpage exceeds the standard. The warpage of the special board should not exceed 0.5 %, the first and second boards should not exceed 1 %, and the third board should not exceed 2 %.
Do not buy plywood with a thickness of less than two pounds. Note that the amount of formaldehyde released from plywood is clearly stated. It is forbidden to sell plates with a formaldehyde emission of more than 5.0 mg/L for interior decoration. While paying attention to the limit of harmful substances, do not neglect the bonding strength of the plywood itself. In the purchase, the plywood can be tilted along the glue layer with a small knife to observe the traces of the residual wood on the adhesive layer. If there is more wood left on the peeling surface, the quality of the plywood is better. For example, the veneer of the plywood is peeled off along the rubber layer, and the residual wood is not seen on the adhesive surface, which proves that the strength of the wood has not been fully exerted and the rubber layer has been destroyed. Therefore, the bonding strength is poor.
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