What is the grade of the board?
The country has not yet officially released on the E0 level of national standards, the current so-called E0 standard for the industry's most common convention.
E0 means: less than or equal to 0.5 mg / l of formaldehyde emission
E1 refers to: less than or equal to 9.0mg / 100g formaldehyde emission
E2 means less than or equal to 30.0 mg / 100 g of formaldehyde emission
