Laboratory sintered (fritted) filters — Porosity grading, classification and designation
NORMA vydána dne 1.10.1980
Označení normy: ISO 4793:1980
Datum vydání normy: 1.10.1980
Počet stran: 7
Přibližná hmotnost: 21 g (0.05 liber)
Země: Mezinárodní technická norma
Kategorie: Technické normy ISO
Description / Abstract: 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.