I.Ngwa:
A na-ejikarị ngwaọrụ nnwale nke gburugburu ebe obibi iji nweta ihe na-adịghị mma na mbibi nke ihe ndị na-abụghị ọla dị ka plastik na roba na-eme ka ọ dị elu nke nrụgide n'okpuru mkpụrụ ya. Ikike nke ihe iji guzogide mmebi nrụgide gburugburu ebe obibi. Emere ngwaahịa a n'ọtụtụ plastics, roba na mmepụta polymer ndị ọzọ, nyocha, nnwale na ọrụ ndị ọzọ. Enwere ike iji bathrostatic nke ngwaahịa a dị ka akụrụngwa nke nwere onwe ya iji mezie steeti ma ọ bụ ọnọdụ okpomọkụ nke nlele ule dị iche iche.
II.Standardlọ Nzukọ:
ISO 4599- "plastik -dimination nke iguzogide nguzogide nrụgide gburugburu ebe obibi (Esc) - quare cramp"
GB / T1842-1999- "usoro nnwale maka nrụgide nke polyethylene"
ASTMD 1693- "usoro nnwale maka nrụgide nke polyethylene"