Wood-based panels are made of corner fibers produced by the processing of wood and mixed with other fibers. At present, the division of wood-based panels on the market is mainly distinguished from the production process of panels. At present, the commonly used wood-based panels are particle-shaped panels, medium-density boards, blockboards (large core sheets), plywoods, and decorative panels such as fireproof boards. Because they have different characteristics, they are used in different furniture manufacturing fields. The material used for the large core board is logs, and the lateral bending resistance is also strong. Raw materials for particleboard and density fiberboard are shredded wood or other materials such as sugar cane stalks. It can be seen that in the selection of materials, particleboard and density fiberboard are far less than large core panels. The material used for the particleboard is not completely pulverized into fibers, but is pulverized into granules and then added by gluing. The MDF is obtained by completely pulverizing the wood raw materials into fibers and then adding them by gluing. Pay attention to the following points when purchasing: 1. When purchasing artificial boards, try to use less plates in the production of adhesives, and do not blindly climb the price, just moderate. 2. The quality test report of the formal board has a grade description of the amount of formaldehyde released. Consumers should go to the formal plate city to buy plates and take the initiative to ask the seller to issue a quality inspection report. 3. When purchasing artificial boards, sales personnel can be required to issue a sheet quality inspection report. The national standard is that the formaldehyde emission limit values ​​are E1 and E2. E1≤1.5mg/L, E2≤5.0mg/L; E1 plate can be used directly indoors, E2 plate must be processed and allowed to be used indoors. It is best to choose E1 grade plates when selecting.
Polypropylene balls have excellent chemical resistance and low density as well as the highest melting point of the volume thermoplastics. Polyethylene balls often used in check valves, relief valves, and float valves, these balls won`t swell when exposed to water. Polyethylene balls offer good chemical resistance. Polypropylene balls are highly resistant to chemicals such as acids, alkalies, alcohols and many inorganic chemicals.
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