90.93 Standard confirmed Mar 13, 2023
ISO
International Standard
71.040.20 Laboratory ware and related apparatus
Filters are graded according to their pore size index in one of the eight classes specified. This is applicable to laboratory filters made of glass, vitreous silica, ceramics, metals and plastic materials. Annex A specifies a method for determination of pore size index. Annex B and C concern with a procedure for assessing uniformity of filters and for determination of air permeability.
PUBLISHED
ISO 4793:1980
90.93
Standard confirmed
Mar 13, 2023