E fetaui lelei mo le fauina o le tulilima, tee, koluse ma foliga Y (45° ma le 60°) fa'apipi'i o PE, PP, PVDF ile faleaoga. Faʻaaogaina foi e faʻaumiumi ai le tui faʻapipiʻi faʻapipiʻi, faia tuʻufaʻatasiga faʻapipiʻi ma uʻu saʻo paipa ma fetaui ma isi.