(c) it has a membrane that is inset in the cover, that has a minimum surface area of 0.28 m /kA of current and that has pore openings not larger than 1 µm; and
c) il est muni d’une membrane qui est encastrée dans le couvercle et qui possède une surface minimale de 0,28 m /kA de courant et des pores d’une taille maximale de 1 µm;