, ▁and / or ▁mill ing . ▁The ▁cr ushed ▁pieces ▁are ▁then ▁separated ▁into ▁fib re - rich ▁and ▁res in - rich ▁fra ctions . ▁These ▁fra ctions ▁are ▁ultimately ▁incorpor ated ▁into ▁new ▁compos ites ▁either ▁as ▁fill ers ▁or ▁rein for c ements . ▁ ▁Chem ical ▁Process ing / Py ro ly s is : ▁Th erm al ▁decomposition ▁of ▁the ▁compos ites ▁is ▁used ▁to ▁recover ▁the ▁individual ▁fib res . ▁For ▁py ro ly s is , ▁the ▁material ▁is ▁he ated ▁up ▁to ▁ 5 0 0   ° C ▁in ▁an ▁environment ▁without ▁o xygen , ▁thus ▁causing ▁it ▁to ▁break ▁down ▁into ▁lower ▁weight ▁organ ic ▁subst ances ▁and / or ▁g ase ous ▁products . ▁The ▁glass ▁fib res ▁will ▁generally ▁lose ▁ 5 0 % ▁of ▁their ▁initial ▁strength ▁and ▁can ▁now ▁be ▁down cyc led ▁for ▁fib re ▁rein for cement ▁applications ▁in ▁pain ts ▁or ▁concrete . ▁Research ▁has ▁shown ▁that ▁this ▁end ▁of ▁life ▁option ▁is ▁able ▁to ▁recover ▁up ▁to ▁approximately ▁ 1 9 ▁M J / kg . ▁However , ▁this ▁method ▁has ▁a ▁relatively ▁high ▁cost ▁and ▁requires ▁similar ▁mechanical ▁pre - processing . ▁In ▁addition , ▁it ▁has ▁not ▁yet ▁been ▁modified ▁to ▁satisfy ▁the ▁future ▁need ▁of ▁large ▁scale ▁wind ▁tur bine ▁bla de ▁rec y cling . ▁ ▁Direct ▁Struct ural ▁rec y cling ▁of ▁compos ites : ▁Develop ed ▁to ▁combat ▁the ▁in e ffic ien cies ▁and ▁costs ▁associated ▁with