ISO 4793:1980
ISO 4793:1980

Status : Published (Under review)

This standard was last reviewed and confirmed in 2023. Therefore this version remains current.
Format Language
std 1 63 PDF
std 2 63 Paper
  • CHF63
Convert Swiss francs (CHF) to your currency


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.

Read sample 

Preview this standard in our Online Browsing Platform (OBP)

General information

  •  : Published
     : 1980-10
    : International Standard confirmed [90.93]
  •  : 1
     : 7
  • ISO/TC 48
  • RSS updates

Life cycle

Got a question?

Check out our FAQs

Customer care
+41 22 749 08 88

Opening hours:
Monday to Friday - 09:00-12:00, 14:00-17:00 (UTC+1)