For laminate flooring, the floor of the main environmental standards that formaldehyde emission. Limit for formaldehyde emission standards on green flooring industry experienced a total of E1, E0, FCF three technical revolution. In the early stages, the formaldehyde emission standards for wood-based panels E2 class (formaldehyde emission ≤30mg / 100g), its limited release formaldehyde very loose, even if they meet the standards of products, its formaldehyde content may also be more than E1 grade artificial board more than three times, serious harm to human health, it must not be used for home decoration. So with the first green revolution, in this green revolution, flooring industry to implement E1 class environmental standards, that formaldehyde emission of ≤1.5㎎ / L, although basically do not pose a threat to humans, but the floor still remained Many free formaldehyde. Flooring industry began a second green revolution, launched E0 class environmental standards, so that the floor formaldehyde emission was reduced to 0.5㎎ / L. The best way to distinguish whether the floor is green with a screwdriver and hammer to pry open the floor from where the lock, so that a large area of ??floor substrate exposed, then with the smell, good taste of wood flooring should be, there is poor strong pungent smell!