The adhesive that is used at agglutinate base material for the most part on market at present is formaldehyde kind adhesive, chemistry is not stable easy release formaldehyde; but as process of preparation of MDI(of the adhesive that do not have aldehyde need not formaldehyde) be born, the man-made that uses MDI glue to commercial composite wood landscape edging make board already can come true true " without aldehyde " . Accordingly, formaldehyde is not man-made board " original sin " , of its formaldehyde content more or less should written guarantee the wood composite soffit circumstance of operable makings is judged.

The directive and normative the earliest traceable that man-made board formaldehyde releases a quantity Europe, it is by Germany man-made board company loves case (EGGER) place is made composite structural roof decking and be inducted to be Europe to unite a standard gradually, the standard of JAS star class that divides Japan of;

of level of A, B/E1, E2 is relatively rigid, the requirement of top level is most slashing. On market popularize generally " E0 " class is our country proper motion actually the formaldehyde that make releases volume level, not be international standard, but its numerical value already kept balance with high level of Japan,outside wall of a room with non breakable and water proof pvc sheet formaldehyde releases a quantity already very low. Pure alias treating form says the likelihood is promiscuous (the level that is like GB E1 and Ou Biao E1 is different) , must be in same quality standard, same measure the Caikebi below the unit relatively.