Today's laminate flooring is generally composed of four layers of composite materials, namely wear layer, decorative layer, substrate layer and moisture barrier. The bottom layer is a moisture-proof layer, generally made of polyester material; the base material layer is the main part of the reinforced composite wood floor, and the MDF is mostly used as the substrate; the substrate layer is above the decorative layer, and a specially processed paper is used as the material. The wear layer is a layer of anti-wear agent uniformly pressed on the surface of the laminate floor. Among the four layers, the base layer is the most important. It is the core component of the laminate flooring. It is mainly composed of pine and fast-growing trees. After being peeled and screened, it is mechanically separated and chemically treated with wood or plant fibers. It is blended with adhesive and waterproofing agent, and then formed by paving, molding and high temperature and high pressure pressing. Its density is relatively uniform and its mechanical properties are close to wood. It is a kind of artificial board which is popular in the world. Generally, there are several methods for inspecting the substrate: (1) Look: First, look at the fineness of the substrate fiber, whether it is uniform, and whether it has impurities; secondly, look at its color, the substrate made of pine as the raw material, and the pine is retained. The natural color is darker, the pine growth cycle is longer, the wood fiber is fully developed, and the physical properties are better. The whitener substrate is mostly fast-growing tree species, and the wood fiber of the fast-growing tree species is incompletely developed and the physical properties are poor. (2) Smell: smell the substrate with no odor. (3) Cooking: You can put the floor of different brands in the same container, soak it in water at 100 °C for 30 minutes. When you take it out, the higher the expansion coefficient, the lower the quality. The lower the expansion coefficient, the better the quality. Hair Scissors,6 Inch Hair Cutting Scissors,Cutting Hair Scissors Set,Design Barber Scissors Set Zhangjiagang Mister Tools Co., Ltd , https://www.mingshitools.com