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10th CSITC Round Trial completed – ICAC

08
Jul '09
The Tenth Round Trial under the auspices of the Task Force on Commercial Standardization of Instrument Testing of Cotton (CSITC RT 2009-1) was conducted from April to June 2009. Fifty-seven testing laboratories with 75 instruments participated.

In each Round Trial, five cotton samples with known values are mailed to each participating laboratory. Each sample is tested six times each day on each participating instrument for five days, for a total of 150 tests. Each sample is tested for the six CSITC parameters of length, length uniformity index, micronaire, strength, Rd (reflectance) and +b (yellowness). Accordingly, 900 separate test results (150 tests of 6 parameters) from each instrument are evaluated.

Instrument results for each Round Trial are collected by USDA and forwarded to the Bremen Fibre Institute for evaluation. Each instrument is given an overall ranking, as well as rankings for performance on each of the six parameters. Rankings are based on the first four upland cotton samples with known values. The purpose of the fifth cotton sample in all CSITC Round Trials is for special study purposes and is not used for performance-ranking.

Results for each instrument are confidential, but each testing facility receives an evaluation of its performance in the Round Trial and a detailed diagnostic analysis of results.

Rankings are based on the results of each instrument in coming closest to the mean (average) values for all instruments participating in the Round Trial on all six parameters. The range of scores for the combined properties among the 75 instruments was 0.26 to 2.30 (a score of zero would be perfect), and the median overall evaluation of combined properties was 0.51.

The typical inter-laboratory variations achieved by instrument testing, given
as standard deviations, were:
CSITC RT 2009-2
- Property Standard Deviation Standard Deviation : based on Single Tests based on 30 Tests/Sample

Micronaire 0.08 mic 0.07 mic
Strength 1.16 g/tex 0.88 g/tex
Length 0.016 inches 0.012 inches
Length Unif. 0.9 units 0.6 units
Color Rd 1.16 units 1.13 units
Color +b 0.47 units 0.41 units

Benefits of Participation
Participants in CSITC Round Trials benefit from detailed feedback that can be utilized to demonstrate measurement performance to customers and to address measurement related problems. Results will confirm the participant's ability to provide reproducible test measurements that are based on the established international standard. In addition, participation is a recommended practice for fulfilling quality management requirements in laboratories (e.g. ISO 17025).

The CSITC Round Trials complement, but do not replace, the Bremen Cotton Round Trial and the USDA HVI Checktest. Participation in CSITC Round Trials provides numerous benefits:
o Statistically robust evaluations of instrument performance based on 4 cottons and 30tests per cotton during each Round Trial,


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