Formaldehyde is a highly toxic gas, colorless, irritating and soluble in water. It has the function of coagulation protein, and its 35%~40% aqueous solution is commonly known as formalin, and is often used as a solution for impregnating specimens. Formaldehyde ranks second in the priority control list of toxic chemicals in China, and the release period is generally 3 to 15 years. It has been identified as a carcinogenic and teratogenic substance by the World Health Organization. It is a recognized source of allergic reaction and a potential One of the mutations.
Formaldehyde can also come from paints, chemical fiber carpet cleaners, insecticides, disinfectants, preservatives, printing inks, and paper indoor smoking. Formaldehyde has strong adhesion, and can strengthen the hardness and anti-insect and anti-corrosion ability of the board. Therefore, formaldehyde is used as a binder in various particleboard, plywood, large core board, medium density fiberboard and plywood on the market. , will be released in case of heat and deliquescence. Generally, the newly renovated house can have a formaldehyde content exceeding 6 times, and individual cases may exceed 40 times.