▁will ▁not ▁deg rade ▁in ▁mo ist ▁environments . ▁P F ▁res ins ▁have ▁not ▁been ▁found ▁to ▁pose ▁significant ▁health ▁ris ks ▁due ▁to ▁formal de hy de ▁em issions . ▁While ▁P F ▁is ▁an ▁excellent ▁ad hes ive , ▁the ▁engine ered ▁wood ▁industry ▁has ▁started ▁to ▁shift ▁toward ▁poly ure th ane ▁bind ers ▁like ▁p M DI ▁to ▁achieve ▁even ▁greater ▁water - res istance , ▁strength , ▁and ▁process ▁efficiency . ▁p MD Is ▁are ▁also ▁used ▁extens ively ▁in ▁the ▁production ▁of ▁rig id ▁poly ure th ane ▁fo ams ▁and ▁ins ul ators ▁for ▁re fr iger ation . ▁p MD Is ▁out perform ▁other ▁res in ▁ad hes ives , ▁but ▁they ▁are ▁not or iously ▁difficult ▁to ▁release ▁and ▁cause ▁bu il dup ▁on ▁tool ing ▁surfaces . ▁ ▁Other ▁fix ations ▁Some ▁engine ered ▁products ▁such ▁as ▁C LT ▁Cross ▁L amin ated ▁Tim ber ▁can ▁be ▁assemble d ▁without ▁the ▁use ▁of ▁ad hes ives ▁using ▁mechanical ▁fixing . ▁These ▁can ▁range ▁from ▁profile d ▁inter lock ing ▁joint ed ▁bo ards , ▁propriet ary ▁metal ▁fix ings , ▁n ails ▁or ▁tim ber ▁dow els ▁( B rett st ap el ▁- ▁single ▁layer ▁or ▁C LT ). ▁ ▁Stand ards ▁ ▁The ▁following ▁standards ▁are ▁related ▁to ▁engine ered ▁wood ▁products : ▁ ▁EN ▁ 3 0 0 ▁- ▁Ori ented ▁Str and ▁Bo ards ▁( O SB ) ▁— ▁De fin itions , ▁classification ▁and ▁specific ations ▁