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2022
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Where does formaldehyde in indoor air come from
Source:
Luoyang Ecological Environment Bureau; Map/Photographic Network
The sources of formaldehyde in indoor air mainly include the following aspects:
1. For plywood, blockboard, medium density fiberboard, particleboard and other man-made boards used for interior decoration, formaldehyde has strong adhesion, and also has the function of strengthening the hardness of the board, preventing insects and corrosion. Therefore, the urea formaldehyde resin with formaldehyde as the main component used in the production of man-made boards at present will gradually release the residual and non reactive formaldehyde in the board to the surrounding environment, It is the main body to form formaldehyde in indoor air;
2. For furniture made of wood-based panels, some manufacturers, in order to pursue profits, use unqualified panels, and then use inferior glue when bonding veneer materials. The manufacturing process is not standardized. As a result, customers buy home, which is equivalent to buying back a small exhaust emission station;
3. Other kinds of decorative materials containing formaldehyde and likely to be distributed to the outside world, such as wall covering, wallpaper, chemical fiber carpet, foam plastic, paint and coating, etc;
4. Some materials that will emit formaldehyde after combustion, such as cigarettes and some organic materials.
In addition, the concentration of formaldehyde in indoor air is related to the following four factors: 1. indoor temperature; 2. Indoor relative humidity; 3. Loading degree of indoor materials (i.e. surface area of formaldehyde emitting materials per cubic meter of indoor space); 4. Number of indoor air changes (i.e. indoor air circulation). Under the conditions of high temperature, high humidity, negative pressure and high load, formaldehyde emission will be intensified. The measured data shows that under certain conditions, the concentration of formaldehyde in indoor air can accumulate above the standard allowable level, and the release period is relatively long. The research of Yokohama National University in Japan shows that the release period of indoor formaldehyde is generally 3-15 years!
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