ʻO ka ʻili EPU a i ʻole hiki iā ʻoe ke kapa iā ia he ʻili ʻili PU manuahi ʻole a i ʻole ʻili ʻili PU non solvent a ʻo kēia mea he mea hoʻomaikaʻi ʻia ka ʻili synthetic PU.Paʻa ke ʻano o ka EPU a me 7-15 mau makahiki hydrolysis kūpaʻa a ʻo kēia mea hou he mea pili i ke kaiapuni.