<p>wood releases quantity cent to be 3 level according to formaldehyde, it is E0 class respectively (formaldehyde releases the 0.5mg/L) that measure ≤ , e1 class (formaldehyde releases quantity 0.5mg/I~1.5mg/L) , e2 class (formaldehyde releases a quantity to be more than 1.5mg/L) . The wood that obtains E1 class attestation only just can be used at indoor decorate, building materials of environmental protection of the green that be called, harmless to human body, formaldehyde of E0 class plank releases a quantity to be the 1/3 of E1 class only, suit to use as more undoubtedly the resistance such as children, pregnant woman is low the bedroom of the crowd is decorated. Health is severe anthology, defend China greatly red aggrandizement floor is puissant upgrade E0, environmental protection base material, advanced equipment, masterly craft creats " more healthy floor " ! </p>