One step in the development of any new standard test method is to estimate the uncertainty of the method. This method is normally performed in a precision experiment, in which samples are sent to several laboratories and the results are compared. Such a precision experiment is often referred to as "interlaboratory comparative testing". ISO/TS 24498 discusses terms, definitions, procedures, preparation of an interlaboratory study, testing, analysis of the results and re-evaluation of the uncertainty.
ISO/TS 24498 presents guidelines for a methodology for the estimation of the uncertainty of methods for testing lignins and kraft liquors, pulps, paper, board, cellulosic nanomaterials, as well as products thereof containing any portion of recycled material or material intended for recycling.
ISO/TS 24498 on the uncertainty of test methods for paper, board and pulps is useful for:
Paper and board materials as well as cellulosic nanomaterials are very sensitive to changes in relative humidity and temperature. Changes in the environmental conditions may induce significant moisture content variations in paper and board, which may induce changes in physical and mechanical properties. Due to product heterogeneity, randomisation of the samples and /or test pieces is essential to minimize the impact of such variability. For the same reason, the variation in the properties can increase drastically when the test piece size decreases. These reasons make it necessary to have special instructions for precision experiments for pulp, paper, board and cellulosic nanomaterials.
ISO/TS 24498 helps users decide the maximum difference between two samples. ISO/TS 24498 assists in the verification of conformance with a specification at a production central testing laboratory site or in an independent laboratory. ISO/TS 24498 helps users with evaluating new test methods, where the aim is to verify that the precision of the test method is acceptable. ISO/TS 24498 also guides users with the determination of a precision statement for an existing test method either where one does not exist or where it requires revision.
The guidelines in ISO/TS 24498 help you estimate the uncertainty of test methods for paper, board and pulps that enables you to provide a superior quality product to the users.
PD ISO/TS 24498:2022 supersedes ISO/TR 24498:2019. PD ISO/TS 24498:2022 includes some technical changes with respect to ISO/TR 24498:2019. These include:
ISO/TS 5733