Oghere nke sieve molecular 5A bụ ihe dị ka angstroms ise, nke a na-akpọkwa sieve molecular calcium.Enwere ike iji ya na ngwa mgbasa ozi na-eme ka ikuku oxygen na ụlọ ọrụ na-emepụta hydrogen.
Ụkpụrụ na-arụ ọrụ nke sieves molecular bụ nke metụtara pore size nke sieves molecular, wHa nwere ike na-eme ka ụmụ irighiri gas nke dayameta molekụla dị ntakịrị karịa nha pore.Ka oke nha nke pore buru ibu, ka ikike mgbasa ozi na-abawanye.Ogo pore dị iche iche, na ihe ndị a na-ehichapụ na nkewa dị iche iche dịkwa iche iche. Mgbe a na-eji ya dị ka ihe na-ekpo ọkụ, sieve molecular nwere ike ịmịkọrọ ihe ruru 22% nke ibu ya na mmiri.