NS EN 141 : 2ED 2000

Foreword
Introduction
1 Scope
2 Normative references
3 Definitions
4 Description
5 Classification
    5.1 Introduction
    5.2 Types of filters
          5.2.1 Gas filters
          5.2.2 Multi-type gas filters
          5.2.3 Combined filters
          5.2.4 Special filters
    5.3 Classes of filters
6 Designation
7 Requirements
    7.1 General
    7.2 Nominal values and tolerances
    7.3 Visual inspection
    7.4 Connection
    7.5 Mass
    7.6 Multiple filters
    7.7 Material
    7.8 Packaging
    7.9 Mechanical strength (M.S.)
    7.10 Temperature conditioning (T.C.)
    7.11 Breathing resistance
    7.12 Gas capacity
    7.13 Combined filters
          7.13.1 General
          7.13.2 Filter penetration
    7.14 Clogging (optional)
          7.14.1 General
          7.14.2 Filter penetration
          7.14.3 Breathing resistance
8 Testing
    8.1 General
    8.2 Visual inspection
    8.3 Mechanical strength (M.S.)
          8.3.1 Test equipment
          8.3.2 Test procedure
    8.4 Temperature conditioning (T.C.)
    8.5 Test flow conditions
          8.5.1 General
          8.5.2 Multiple filters
    8.6 Breathing resistance
    8.7 Gas capacity
          8.7.1 General
          8.7.2 Filters Type A, B, E and K
          8.7.3 Special filters
    8.8 Filter penetration
9 Marking
    9.1 General
    9.2 Filters
    9.3 Special markings
    9.4 Filter package
10 Information supplied by the manufacturer
Annex ZA (informative) Clauses of this European Standard
                         addressing essential requirements
                         or other provisions of EU Directive

Explains gas filters and combined filters for use as components in unassisted respiratory protective devices with the exception of escape apparatus and filtering facepieces. Laboratory tests are included for the assessment of compliance with the requirements. May also be suitable for use with other types of respiratory protective devices.