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The thickness of the water swell rate reflects the water resistance of the substrate. As the floor of the substrate, its water resistance should be compared with furniture MDF, HDF (high density board English abbreviation) high. This indicator is very important. Good water resistance of the substrate size stability is better, is not sensitive to moisture, not easy to deformation.
The current national standards for reinforced flooring GB18102? D2000 in the laminate floor water swelling thickness of the test method 25 × 25 (mm) of the specimen, on (20 ± 2) ℃ water immersion 24 hours to the specimen The thickness of the center point before and after immersion changes, to calculate the swelling thickness of the water swelling. In fact, the moisture from the edge of the laminate flooring after immersion, moving in the board is relatively slow, often the edge of the expansion of the specimen has been very powerful, and the central part of the expansion has not yet, so the thickness of the center point to calculate the swelling thickness of water swelling The rate of its value is very small.
It can be inferred that this may be caused by improper testing methods deviations. In the European standard for laminate flooring, the specimens tested for water swelling thickness were rectangular, 100 mm long and 50 mm wide, and immersed in water with a length of only 50 mm and immersion time of 24 hours, but with three edges immersed in water The midpoint of the part is the basis for thickness measurement. This test method is relatively close to reality, but also a true reflection of the waterproof laminate flooring performance.
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