Laboratory sintered (fritted) filters — Porosity grading, classification and designation

Adopted by the Council as a standard on 10/08/2026

Sector: Health and Personal Care

Project Method: Adoption without modification

Project Type: New

International Classification for Standards (ICS)

Code	Classification
71.040.20	Laboratory ware and related apparatus

Adopted Standard

	Standards / Amendment / Corrigendum
1	ISO 4793:1980

Scope

This International Standard specifies a System of porosity
grading, classifying and designating laboratory sintered (fritted)
filters by the determination of pore size index.
lt is applicable to laboratory filters made of glass, vitreous silica,
ceramics, metals and plastic materials.
Test methods are included in annexes B and C for the determination
of air permeability and uniformity of pore size, but
these characteristics do not form part of the requirements of
this International Standard.