O le ata e gaosia e ala i le tuʻuina atu, ma o le polyethylene raw material o loʻo faʻapipiʻiina ma faʻapipiʻiina e ala i le tuʻuina atu, o mea faʻapipiʻi e faʻaopoopoina se tasi ituaiga o mea e sili ona maualuga le elastomer i le gaosiga o le gaosiga, ma o se gaioiga faʻapitoa e faʻaaogaina e faia ai le ata tifaga. uiga o le mamafa kalama maualalo, lagona vaivai sili, maualuga elongation fua faatatau, maualuga hydrostatic pressure, maualuga elastic, paʻu-faauo, maualuga pa puipui faatinoga, maualuga impermeability, etc.O lenei mea e mafai ona fetuunai le lagona o le lima, lanu ma le lomitusi lanu e tusa ai ma manaoga o tagata faatau.