Large core board should not be too heavy
Blockboard, commonly known as the large core board, is made up of two veneers laminated in the middle. In the middle of the blockboard is a core made of natural wood strips, with thin veneers on both sides, which is one of the most important materials in the decoration. It can be used for furniture and wooden doors and door covers, heating covers, curtain boxes, etc. Its waterproof and moisture-proof performance is superior to particleboard and MDF.
When selecting a large core board, it is important to look at the internal wood, which should not be broken, and the blockboard with a gap of about 3 mm between the woods is suitable.
Many consumers choose large core boards, one looks at the weight, and the other looks at the price. In fact, the weight exceeds the normal large core board, indicating the use of miscellaneous wood. The large core board made of miscellaneous wood is not nailed at all, so it cannot be used.
Home decoration can only use E1 level large core board. The E2 grade large core board may also contain more than three times more formaldehyde than the E1 grade core board, so it should never be used for home decoration.
Secondly, it is necessary to purify and seal the large core board which cannot be finished, especially the decorated backboard, various cabinet inner panels and heating hoods. At present, experts have developed formaldehyde sealants, formaldehyde-blocking waxes, and aerosols that eliminate and block formaldehyde, and the best results are used.
Generally, no more than 20 large core plates should be used in the living room of about 100 square meters. Excessive use will result in excessive formaldehyde in the indoor environment. In particular, do not use a large core board as a lining under the floor.
How to choose a high quality core board
Look at the manufacturer's trademark, production address, anti-counterfeiting mark, etc.
Second, look at the amount of formaldehyde released in the product test report is less than or equal to 1.5 mg per liter. Generally, there are test reports produced by regular manufacturers. The lower the detection value of formaldehyde, the better.
Third, look at the appearance quality of the large core board. Look at whether the surface of the large core board is flat, whether there is warpage or deformation, whether there is blistering or sag; the blockboard can be cut open at the scene or during construction to see if the inner core strip is even and tidy, and the smaller the gap, the better.
Fourth, see if there is any smell. If the large core board emits a fragrant wood smell, it means that the amount of formaldehyde released is small; if the smell is pungent, it means that the amount of formaldehyde released is large, so don't buy it.
Waterproof coating: raw material ingredients are the key
The importance of waterproof coatings in home decoration is unquestionable, but how to choose? Waterproof application experts reminded that when purchasing waterproof coatings, in addition to choosing relatively well-known brands, attention should also be paid to raw material components. For example, coatings with better waterproof performance should generally contain â€œsilicone-modified acrylicâ€ and others adopt â€œcore shellâ€. "Technology, more advanced is the containment of "organic fluorine", these products should be excellent.
It is understood that the waterproof coatings currently on the market can be roughly divided into three types: modified asphalt waterproof coatings, which are used in combination with glass cloth, and the engineering is relatively complicated; polyurethane waterproof coatings, which generally contain toluene, two The organic solvent of toluene and other components is diluted to contain toxicity; the recently-applied silicone rubber waterproof coating is mainly made of polymer synthesis technology, has good waterproof and moisture-proof functions, and is relatively simple to construct.
Four strokes to judge whether cement is good or bad
At first glance, see if the cement paper bag is in good condition and the logo is complete. The labels on the paper bag are: factory name, production license number, cement name, registered trademark, variety (including variety code), label, packaging year, month, day and number.
Second, use your fingers to rub the cement powder and feel a little fine, sand, and powder, indicating that the fineness of the cement is normal.
Third, look at the color, observe whether the color is dark gray or dark green, the color is yellow and whitish (yellow indicates that the clinker is raw material, and the white indicates that the slag is excessively added).
Look at the time and see the cement production date. The performance of cement over 30 days has decreased. After three months of storage, the strength of cement decreased by 10%-20%, after 15 months, it decreased by 15%-30%, and after one year, it decreased by 25%-40%. High quality cement, can solidify for more than 6 hours. The quality of cement that cannot be solidified for more than 12 hours is not good.
It is best to add a word â€œmust comply with national standardsâ€ on the purchase contract or invoice, and it is best to leave a sample in the construction. Once the project is finished, it is found that the indoor environmental pollution caused by the quality of the large core board can be judged. Basis for responsibility.
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