On the other hand, a post treated {HEAD ~ hardboard} heated at 300° F. for 15 minutes lost {TAIL ~ about 37%} of its phosphorus content whereas one heated at that temperature for 60 minutes lost only 5% Consolidation of a treated dry mat in a hardboard press at from about 400° F. to about 480° F. for from about 2 minutes to about 3 minutes gives a flame resistant hardboard of this invention 
On the other hand , a post treated { HEAD ~ hardboard } heated at 300 ° F. for 15 minutes lost { TAIL ~ about 37 % } of its phosphorus content whereas one heated at that temperature for 60 minutes lost only 5 % Consolidation of a treated dry mat in a hardboard press at from about 400 ° F. to about 480 ° F. for from about 2 minutes to about 3 minutes gives a flame resistant hardboard of this invention
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH