Standard
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AS/NZS ISO 17420.3:2021
[Current]Respiratory protective devices — Performance requirements, Part 3: Thread connection
AS/NZS ISO 17420.3:2021 identically adopts ISO 17420-3:2012 for Australia, which applies to an unassisted filtering device and specifies a standard thread connection between a filter and the respiratory interface as required in AS/NZS 17420.2. This document also includes the description of test simulators that are necessary for the assessment of some of the requirements. KEYWORDS: Respiratory protective devices; Filtering device; Thread connection
Published: 13/08/2021
Pages: 19
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
1 Scope
2 Normative references
3 Terms, definitions and symbols
3.1 Terms and definitions
3.2 Symbols
4 Requirements
4.1 Elements of thread connection
4.2 Sealing element
4.3 Geometry of thread profile
4.3.1 Circularity of threads
4.3.1.1 General
4.3.1.2 Circularity of the male thread
4.3.1.3 Circularity of the female thread
4.3.2 Male thread connector
4.3.2.1 General
4.3.2.2 Sealing surface
4.3.2.3 Dimensions
4.3.3 Female thread connector
4.3.3.1 General
4.3.3.2 Dimensions
4.3.4 Sealing element
4.3.5 Absence of geometric interference
4.4 Physical and mechanical requirements of the thread connection
4.4.1 Resistance of the connectors to pull forces
4.4.2 Physical and mechanical requirements of the sealing element
4.4.2.1 Hardness
4.4.2.2 Compression set
5 Testing
5.1 Visual inspection
5.2 Circularity of threads
5.2.1 Circularity of male threads
5.2.2 Circularity of female threads
5.3 Geometry of male thread connector
5.4 Geometry of female thread connector
5.5 Beginning of the effective thread of the male connection
5.6 Resistance of the connectors to pull forces
6 Marking and identification
Bibliography
Cited references in this standard
[Current]
Rubber, vulcanized or thermoplastic - Determination of compression set - Part 1: At ambient or elevated temperatures
[Superseded]
Rubber, vulcanized or thermoplastic - Determination of indentation hardness - Part 1: Durometer method (Shore hardness)
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