Environmental Performance of Blockboard

Formaldehyde-based adhesives are typically used during the production of blockboard; consequently, the finished product releases varying amounts of free formaldehyde. If the level of free formaldehyde exceeds certain limits, it can pose a risk to human health. While accurately measuring formaldehyde emissions is a complex process, a simple preliminary assessment can be performed using the following method: stack unused blockboard in a small room, close the doors and windows, and-after a period of time-enter the room to observe the air quality. The absence of a pungent odor indicates low formaldehyde emissions, meaning the board is safe for use; conversely, a strong odor or eye irritation suggests potentially high formaldehyde emissions.
Regarding the issue of formaldehyde, the material features internal pores with diameters ranging from 0.27 to 0.98 nanometers, arranged in a crystalline structure. It also exhibits weak electrical properties. Since the molecular diameters of formaldehyde, ammonia, benzene, toluene, and xylene fall within the 0.4 to 0.62 nanometer range-and because these are polar molecules-the material preferentially adsorbs harmful gases such as formaldehyde, benzene, and TVOCs, thereby purifying indoor air. It is capable of adsorbing and decomposing formaldehyde and can be reused after exposure to sunlight.