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Not long ago, the Beijing Bureau of Quality Supervision sampled large core boards sold in key building material markets in Beijing's six major sales boards. The sampling pass rate was only 53.3%. The major problem with unqualified large core boards is still the excessive release of formaldehyde, far exceeding the national control standards.
The Daxinban is an indispensable material for home decoration. How should consumers and decoration companies purchase and use large core boards? In response, experts from the China Indoor Decoration Association's Indoor Environmental Monitoring Center provided detailed answers.
Five directions to buy
The State Bureau of Quality Supervision on the "interior decoration materials and artificial wood and its products in the limited amount of harmful substances" was introduced last year, requiring the direct use of indoor large core board of formaldehyde emission must be less than or equal to 1.5 mg / liter. And, experts suggest that you should pay attention to the following issues when purchasing large core boards:
1 see manufacturers. Pay attention to whether it is a regular manufacturer's product. To check the manufacturer's trademark, production address, anti-counterfeit signs and other important information;
2 see the report. See if the amount of formaldehyde released is less than or equal to 1.5 mg/L. In general, regular manufacturers produce test reports, and formaldehyde detection values ​​should be as low as possible.
3 look the appearance. Look at whether the surface of the Daxin board is smooth, deformed, warped, sunken, or blistering; whether the arrangement of the core strips is even and neat, and where the gap is as small as possible, whether the core strip has any wormholes, knots, rot, decay, etc. In general, the inner quality of the large core board with good appearance quality is correspondingly better.
4 Look at the smell. If the Daxinban emits a scent of fragrant wood, it means that the release of formaldehyde is less; if the smell is pungent, it means that the release of formaldehyde is more, and must not be purchased.
5 look at the price. The low price of Daxin board, its quality will certainly be very poor. So when you choose, it is best to choose a 100 yuan a big core board. The price of Daixinban, its relatively stable quality.
For example, after the country imposes restrictions on the amount of harmful substances for decoration, the adhesive used for large core boards must be improved. This cost alone increases by about 10%, and the price of raw materials continues to increase, so it can be said that it is truly green. The Daxin Ban of 50-60 yuan is impossible to manufacture, and it is in line with the national standard of the E1-class Daxin Ban. The 90-yuan or so is already a meager profit. If consumers are blindly pursuing the cheap to buy cheap and bad quality big core boards that seriously harm human health, it will be difficult for the regular production companies to survive. Home decoration can only use E1 level Daxin board. If the product is an E2 grade large core board, even if it is a qualified product, its formaldehyde content may be more than three times that of the E1 grade large core board, so it cannot be used for home decoration. Once again, it is necessary to purify and seal large-core boards that cannot be finished, especially in the back-sheets for decoration, various interior panels, and heating covers. Currently, experts have developed formaldehyde sealants, formaldehyde-enclosed waxes, and elimination Closed formaldehyde aerosols are best used for decoration. However, if the amount of E1 class large core board is too large, it may cause the indoor total formaldehyde content to exceed the standard, so even if it meets the standards, it does not necessarily absolutely harm the human body.
At the same time, add a phrase “must meet the national standards†on the purchase contract or invoice, and at the same time, leave a sample in the construction. Once the project is completed, it is found that due to the quality problems of the big core board, the indoor environment may be polluted. This can be used as Judging the basis of responsibility. Because according to the requirements of national standards, from July 1, 2002, large core boards that do not meet the national standards are not allowed to be sold in the market.
In the process of using the big core board, how can we reduce the amount of formaldehyde released? According to expert opinion, attention should be paid to such aspects: First, we must first determine the amount of use. General 100m2 room using large core board not more than 20, while also considering other indoor decoration, such as plastic and other high aldehyde content of building materials, if used too much will also cause formaldehyde in the indoor environment exceeded.
The second is to do a good deal with Daxinban's finishes. According to the requirements of the State's "Restrictions on the Harmful Substances of Wood-based Panels and Products for Interior Decoration Materials," large-core panels with a formaldehyde emission of less than or equal to 1.5 mg/litre must be decorated. Surface treatment allows use indoors.
Thirdly, it is emphasized that large core boards that cannot be treated with a veneer should be purified and closed, especially in the back panels of the interior decoration, various kinds of cabinet interior panels, and heating covers. Currently, experts have studied the formaldehyde sealants and formaldehyde-sealed waxes. As well as eliminating and sealing formaldehyde aerosols, they are best used for decoration.
Fourth, after the renovation, we must pay attention to the detection and purification of formaldehyde in indoor air. Because formaldehyde in the indoor environment can cause harm to the human body's respiratory system. Do not rush to stay in the renovated room, you should first find the indoor environment monitoring department to detect and manage, listen to the views of experts, select the right check-in time.
Kill: Buy Daixin 5 to see 4 places
Blockboard, the industry called it Daxinban. In fact, the work of the Daxin board is not complicated. It is only made by splicing the board with two boards. The prices of large core boards are also cheaper than those of fine core boards. They can be used as furniture and heating covers, wooden doors and door covers, curtain boxes, etc. Their waterproof and moisture-proof performance is better than that of medium density boards and particleboards. When looking at the interior of the wood, it should not be too crushed. A blockboard with a gap of about 3mm between the wood is the top grade. When the paint is applied directly, the wood grain on the surface is very unattractive, so it is usually a plywood (decorative) plywood. Wooden furniture such as furniture made with a large core board must go through two processes of using glue boards and paint, and the cost is higher. Everyone can choose according to the pressure and intensity they are under. The thicker the price, the higher the price.