hat
Aplike nan tès pèmeyabilite ki lè nan diferan kalite papye (pa gen papye a sifas ki graj), tankou papye sak siman, sak kraft papye, papye kab, kopi papye, papye filtre ak sou sa.
eng
Applying in testing air permeability of different kinds of paper (not contain the rough surface paper), such as cement bag paper, sack kraft paper, cable paper, copy paper, filter paper and so on.