Formaldehyde in indoor air has become the main pollutant affecting human health.
The main reasons for indoor formaldehyde exceeding the standard are:
(1) plywood, blockboard, medium density fiberboard, particleboard and other artificial boards for interior decoration. Formaldehyde is the main component of adhesive used in wood-based panel production, and the residual and unreacted formaldehyde in the panel will be gradually released into the surrounding environment, which is the main body of formaldehyde in indoor air.
⑵ Wood-based panel furniture. In order to pursue profits, some manufacturers use unqualified plates or use inferior glue when bonding veneer materials, and formaldehyde in plates and glue seriously exceeds the standard.
(3) Other decorative materials that contain formaldehyde and may be distributed to the outside world, such as wall covering, wallpaper, chemical fiber carpet, paint, coating, etc.
The concentration of formaldehyde in indoor air is related to the following four factors: indoor temperature, indoor relative humidity, the loading degree of indoor materials (that is, the surface area of formaldehyde emitted per cubic meter of indoor space) and indoor air circulation. Under the conditions of high temperature, high humidity, negative pressure and high load, the release of formaldehyde will be intensified. In general, the release period of formaldehyde can reach 3~ 15 years.