ISO/TR 24498:2019
Paper, board and pulps — Estimation of uncertainty for test methods by interlaboratory comparisons
This document presents guidelines for a methodology for the estimation of the uncertainty of methods for testing pulps, paper, board, cellulosic nanomaterials, and lignins, as well as products thereof containing any portion of recycled material or material intended for recycling.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Procedure
5 Preparation of an interlaboratory study
5.1 Laboratories
5.1.1 Qualification of laboratories
5.1.2 Number of participating laboratories
5.2 Sample preparation and distribution
5.2.1 Number and type of material
5.2.2 Selection of the material
5.2.3 Identification and packaging
5.2.4 Additional and specific care
5.3 Documentation for the interlaboratory study
6 Recommendations for testing
7 Analysis of the results
7.1 Calculations
7.2 Case of interlaboratory study organised by the working group
7.2.1 General
7.2.2 Consistency evaluation
7.2.3 Handling of outlying data
7.3 Case of data provided from proficiency testing services
8 Re-evaluation of the uncertainty
9 Report
10 Archiving raw data
Annex A (informative) Tappi and ISO codifications
Annex B (informative) Example of a recommended form to be distributed to participating laboratories for the collation of results for analysis
Annex C (informative) Example of precision statements for physical properties
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Procedure
5 Preparation of an interlaboratory study
5.1 Laboratories
5.1.1 Qualification of laboratories
5.1.2 Number of participating laboratories
5.2 Sample preparation and distribution
5.2.1 Number and type of material
5.2.2 Selection of the material
5.2.3 Identification and packaging
5.2.4 Additional and specific care
5.3 Documentation for the interlaboratory study
6 Recommendations for testing
7 Analysis of the results
7.1 Calculations
7.2 Case of interlaboratory study organised by the working group
7.2.1 General
7.2.2 Consistency evaluation
7.2.3 Handling of outlying data
7.3 Case of data provided from proficiency testing services
8 Re-evaluation of the uncertainty
9 Report
10 Archiving raw data
Annex A (informative) Tappi and ISO codifications
Annex B (informative) Example of a recommended form to be distributed to participating laboratories for the collation of results for analysis
Annex C (informative) Example of precision statements for physical properties
Bibliography