EN ISO 137:2015

European foreword
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Sampling and preparation of the test specimens
7 Test procedure
8 Measurement procedure
9 Calculation and expression of results
10 Test report
Annex A (informative) - Example of calculation
Annex B (informative) - Accuracy of results and confidence
        limits for mean
Bibliography

ISO 137:2015 specifies the procedure and the measurement conditions for the determination of the wool fibre diameter using a projection microscope.The method is suitable for wool fibres in any form and also for other fibres of reasonably circular cross-section. (In the case of dyed, bleached or finished fibres, the diameter might be different from that of fibres not subjected to such treatments. The estimates of fibre diameter obtained at the various stages of processing one lot of wool will not necessarily be the same.)