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How can I check the quality of plywood?

AUTHOR:CHANTA    TIME:2019-10-22     SOURCE:未知
ABSTRACT:Shouldn't have too much overlapping of these layers of plies while composing. The lines of different layers on the side profile of plywood should be running straight. If they overlap each other too much, its not good. Cautionary Note - Both...

  1. Shouldn't have too much overlapping of these layers of plies while composing. The lines of different layers on the side profile of plywood should be running straight. If they overlap each other too much, its not good. Cautionary Note - Both Core gaps and overlappings are unavoidable effects in a plywood which is a highly manual labour oriented product. No two panels of plywood are ever alike. And no matter which machinery anyone’s using, there will always be a couple of sheets in the lot which just don’t fit the bill but this kind of occurrence should be less than 2-3%. Therefore look for the overall consistency in quality.
  2. Nail Holding Capacity - The strength of a plywood panel is predicated on its capacity to hold a nail while being used in furniture. Before buying a ply, ask your dealer to hammer in a nail (1.5inch #14) into the side profile of a plywood sheet. If the layers split on nailing, the bonding isn’t strong enough and will not work for furniture work.
  3. Test reports - Any genuine manufacturer would have factory lab test reports as well third party test report of their plywood panels. Ask for these from the dealer before purchasing. A good manufacturer generally also offers guarantee on the panels, ask for a certificate if they have one.
  4. Buy according to the purpose you need it for. For indoor furniture, which isn't going to be exposed to water, use BWR grade (moisture resistant), for any furniture which has a chance of getting in contact with water often such as kitchen furniture, use BWP(boiling water Proof) / Marine Ply. You can test a marine ply for its waterproof characteristic by taking a cut sample and boiling it in a pressure cooker for 7 whistles. The layers of the ply shouldn’t delaminate in a genuine case as per standard marine ply. If it splits, its probably not a marine ply.
  5. Prefer Eucalyptus (red Core) plywood over Poplar as its higher in density as well as strength. There is a myth that Gurjan is the best timber to be used in Plywood. Its not when you take into consideration the huge price difference and whether it justifies the almost negligible density difference it has over Eucalyptus. It has the same performance specifications as Eucalyptus but costs a hell lot more! Eucalyptus gets the job done and serves the purpose your ply is intended to do for a lifetime. So instead of buying really expensive Burmese Gurjan( which is not available in Indian anymore, imported from Burma), go for Eucalyptus core.
  6. Look for CM/L numbers stamped on top of the plywood sheets which you can look up online to get the factory details. CM/L numbers are the license numbers of the factories for different grades they are certified to manufacture according to the ISI norms. If the sheet doesn’t have a CM/L number on it, move on.

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