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Previous Proficiency Service
From 2014 to 2025, with the support of participating laboratories, Labthink organized 12 times of proficiency service.
In the past 12 times proficiency service, permeability results are based on analysis of Z-score statistics. The results of tensile and thickness properties were analyzed with Cochran method and Grubbs method, which are usually used in statistical analysis of outliers. Results from previous events are as follow:
Item | Year | Number of results | Straggler | Outlier | |
OTR | 2014 | 104 | 6% | 1% | |
2015 | 79 | 4% | 1% | ||
2016 | 90 | 6% | 3% | ||
2017 | 81 | 9% | 7% | ||
2018 | 88 | 3% | 6% | ||
2019 | 94 | 2% | 5% | ||
2020 | 73 | 1% | 4% | ||
2021 | 86 | 3% | 3% | ||
2022 | 105 | 3% | 10% | ||
2023 | 111 | 3% | 4% | ||
2024 | 119 | 4% | 7% | ||
2025 | 123 | 3% | 12% | ||
WVTR | 2014 | 110 | 7% | 7% | |
2015 | 87 | 3% | 6% | ||
2016 | 100 | 11% | 5% | ||
2017 | 91 | 8% | 11% | ||
2018 | 94 | 4% | 10% | ||
2019 | 102 | 1% | 7% | ||
2020 | 92 | 5% | 5% | ||
2021 | 89 | 3% | 9% | ||
2022 | 112 | 3% | 10% | ||
2023 | 113 | 1% | 6% | ||
2024 | 136 | 3% | 8% | ||
2025 | 133 | 1% | 5% | ||
Tensile property |
Tensile Force at Break | 2017 | 59 | 8% | 8% |
2018 | 76 | 7% | 4% | ||
2019 | 96 | 1% | 9% | ||
2021 | 95 | 0% | 9% | ||
2022 | 126 | 1% | 2% | ||
2023 | 111 | 3% | 8% | ||
2024 | 124 | 1% | 13% | ||
2025 | 118 | 2% | 5% | ||
Tensile Strain at Break | 2019 | 96 | 2% | 14% | |
2021 | 90 | 1% | 22% | ||
2022 | 123 | 2% | 9% | ||
2023 | 111 | 3% | 11% | ||
2024 | 124 | 0% | 13% | ||
2025 | 114 | 1% | 8% | ||
Tensile Strength | 2017 | 59 | 2% | 12% | |
2018 | 76 | 1% | 12% | ||
Thickness | 2019 | 93 | 0% | 6% | |
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