Formaldehyde (HCHO) is a colorless, easily soluble, irritating gas with a strong odor. Formaldehyde can be absorbed through the respiratory tract, and its aqueous solution "formalin" can be absorbed through the digestive tract.
Source: Formal boards such as plywood, blockboard, medium density fiberboard and particleboard used for interior decoration contain formaldehyde. Because formaldehyde has strong adhesion, it also has the function of strengthening the hardness and anti-insect and anti-corrosion of the board, so it is used to synthesize various adhesives such as urea-formaldehyde resin, melamine, amine-formaldehyde resin, phenolic resin. . Other decorative building materials that contain formaldehyde and are likely to be emitted to the outside world, such as prefabricated panels, wall coverings, wallpapers, chemical fiber carpets, foams, paints and coatings using urea-formaldehyde foam as insulation. At present, the urea-formaldehyde resin with formaldehyde as the main component is used in the production of wood-based panels. The residual and non-reactive formaldehyde in the sheet will gradually be released to the surrounding environment, which is the main body of formaldehyde in the indoor air. Decoration materials and new combination furniture are the main sources of formaldehyde pollution.
Hazard: Formaldehyde has a strong carcinogenic and cancer-promoting effect. A large number of literatures indicate that the effects of formaldehyde on human health are mainly manifested in olfactory abnormalities, irritation, allergies, abnormal lung function, abnormal liver function and abnormal immune function. The concentration reaches 0.06-0.07 mg/m3 per cubic meter of air, and mild asthma occurs in children. When the formaldehyde content in the indoor air is 0.1mg/m3, there is odor and discomfort; when it reaches 0.5mg/m3, it can irritate the eyes and cause tearing; reaching 0.6mg/m3, it can cause throat discomfort or pain. Higher concentrations can cause nausea and vomiting, cough and chest tightness, wheezing and even pulmonary edema; when it reaches 30mg/m3, it will cause immediate death.
Long-term exposure to low-dose formaldehyde is more harmful, can cause chronic respiratory diseases, cause nasopharyngeal cancer, colon cancer, brain cancer, menstrual disorders, nuclear mutations, DNA single-strand cross-linking and DNA-protein cross-linking and inhibition of DNA damage Repair, pregnancy syndrome, causing neonatal chromosomal abnormalities, leukemia, causing memory and mental decline in adolescents. Among all the contacts, children and pregnant women and the elderly are particularly sensitive to formaldehyde and the harm is even greater. The International Cancer Institute has recommended it as a suspected carcinogen.