Does Spray Paint Contain Formaldehyde?
1 Answers
Spray paint contains formaldehyde. Definition of Formaldehyde: Formaldehyde is an organic chemical compound with the chemical formula HCHO or CH2O and a molecular weight of 30.03, also known as methanal. It is a colorless, pungent gas that irritates the eyes, nose, and other mucous membranes. Its gas has a relative density of 1.067 (air=1), and its liquid density is 0.815g/cm³ at -20°C. It has a melting point of -92°C and a boiling point of -19.5°C. Formaldehyde is highly soluble in water and ethanol. Its aqueous solution can reach a maximum concentration of 55%, typically 35%-40%, and is commonly sold as a 37% solution, known as formalin. Differences Between Automated and Manual Spray Painting: Electrostatic Dust Removal: Before painting, automated spray painting systems subject all panels to electrostatic dust removal to eliminate surface dust, enhancing paint adhesion and clarity. Manual spray painting does not include this step. Paint Drying: After painting, panels in automated systems enter enclosed drying chambers, allowing the paint to dry and cure in a controlled environment, preventing contamination by dust and impurities, thus ensuring transparency and smoothness. Manual spray painting relies on natural drying, where uneven humidity and dust settling can cause wrinkling, affecting the finish. Painting Process: After dust removal, panels in automated systems are painted in enclosed chambers with eight spray nozzles operating simultaneously at a pressure of 35 kg, ensuring thorough penetration into wood pores and producing a fine, atomized, and even coat. Manual spray painting relies on the operator's judgment, often resulting in uneven thickness, and the spray gun pressure is lower (typically 3-5 kg), leading to a less uniform and smooth finish compared to automated systems.
