Previous Proficiency Service
From 2014 to 2019, with the support ofparticipating laboratories, Labthink organized 6 times of proficiency service.
Inthe past 6 time proficiency service, permeability results are based on analysisof Z-score statistics. The results of tensile and thickness properties wereanalyzed with Cochran method and Grubbs method, which are usually used instatistical analysis of outliers. Results from previous events are as follow:
Item | Year | Number of results | Straggler | Outlier | |
OTR | 2014 | 104 | 5% | 1% | |
2015 | 79 | 3% | / | ||
2016 | 93 | 4% | / | ||
2017 | 81 | 7% | 8% | ||
2018 | 88 | 4% | 6% | ||
2019 | 94 | 2% | 5% | ||
WVTR | 2014 | 110 | 8% | 8% | |
2015 | 87 | 3% | 1% | ||
2016 | 102 | 14% | 3% | ||
2017 | 91 | 8% | 11% | ||
2018 | 94 | 5% | 10% | ||
2019 | 102 | 1% | 7% | ||
Tensile property | Tensile at break | 2017 | 59 | 9% | 9% |
2018 | 76 | 4% | 12% | ||
2019 | 96 | 1% | 9% | ||
Elongation | 2019 | 96 | 2% | 14% | |
Tensile Strength | 2017 | 91 | 2% | 15% | |
2018 | 76 | 2% | 12% | ||
2019 | 93 | 0% | 6% | ||