Tips for buying paulownia lumber：
At first glance, the surface of the blockboard should be flat, free from warping, deformation, blistering or depression; the core strips are evenly arranged, and whether the core strips are decayed, broken, wormholes, knots, etc.
Second shake, lift up a corner of the board and shake it up and down, listening for squeaking or cracking sounds.
Three taps, tap the surface of the board with a sharp-nosed instrument. If the tapping surface has a crisp and clean sound, it indicates that the density is relatively high. If the sound is dull, the density is low. Listen to whether there is any difference in sound everywhere.
Four questions, ask tree species. There are many kinds of raw materials for wood board, mostly soft wood; while hard wood is hard and difficult to press, and requires advanced technology. At present, the Malaysian board technology is the best, using double-sided full eucalyptus material stable structure, harmful gas The release has passed the American CARB certification (this is currently the most stringent limit standard in the world).
Five smell, if the board emits a fragrant wood smell, it means that the amount of formaldehyde emission is less; if the smell is pungent, it means that the amount of formaldehyde emission is more.
Six check, check the report, the test report will clarify the standard, there will be a national standard reference above, the more the excess on the basis of the national standard, the better, the formaldehyde emission ≤0.5mg/L, in line with the E0 standard, the formaldehyde emission ≤1.5mg/L, in line with E1 level standards, formaldehyde emission ≤0.3mg/L in line with California CRAB standards, which is also the most stringent international environmental protection standard.
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