It is not difficult to see that the smaller the “volume†of wood in a sheet, the more glue it uses:
Wood strips (finger joints) - thin wood panels (carpentry panels) - large particles (particle board) - small particles (density board).
It is still an old saying, "Whether the board is environmentally friendly, the key is glue."
At present, there are three environmental protection standards for E0, E1 and E2.
The state has a clear regulation on the amount of formaldehyde released from the board: the amount of formaldehyde released from the building materials directly used indoors must be less than or equal to 1.5 mg per liter, that is, reach the E1 level;
If the amount of formaldehyde released is less than or equal to 5 mg per liter, that is, E2 grade sheet, it must be treated after finishing to be used indoors;
Formaldehyde emissions exceeding 5 mg per liter are substandard.
Except for the E0 grade plate, which uses formaldehyde-free isohydro acid gum (a water-based glue), E1 grade and E2 grade boards basically use urea-formaldehyde glue containing formaldehyde.
Therefore, it is an important content to select the environmental protection grade of the plate. In the national limit standard, if the product that fails to pass the China Environmental Label certification can meet the basic requirements of E1 and E2, the product will also be Available for sale, but E2 is limited to outdoor use.
In this regard, the user should pay attention to the fact that since the production cost of the E2 grade is lower than that of the E1 grade, when purchasing and accepting the sheet, the E2 grade sheet should not be used as an environmentally friendly sheet for interior decoration.
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