In fact, the board itself contains a small amount of aldehyde compounds. The formaldehyde emission of the finished product mainly depends on the type of adhesive used in the bonding process, as well as the board production processes such as ventilation placement, splicing molding, and edge sealing treatment. Therefore, it is impossible to achieve zero formaldehyde and produce products that meet the standards. So it is necessary to determine the environmental protection level of the board. E-level standard: E-level standard certification is a commonly used indicator of formaldehyde emission levels. This standard originated in Germany and was first developed by EGGER as an environmental standard for formaldehyde emission limit levels, which was later cited as a European standard. In China, the standards for artificial boards and their products are mainly formulated based on the European system, so E-grade is divided into European standard E-grade and national standard E-grade The European standard E level includes two levels: E2 level (formaldehyde limit ≤ 1.5mg/L) and E1 level (≤ 0.5mg/L). The national standard E-level includes three levels: E2 (formaldehyde limit ≤ 5mg/L), E1 (≤ 1.5mg/L), and E0 (≤ 0.5mg/L). Among them, the EO level standard is a stricter formaldehyde emission registration mark issued by the country. It has the same restricted release amount as the European standard E1 level, but the E0 standard is only a recommended standard, while the European standard E1 is a mandatory standard, so don't be fooled by merchants.