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Download the report (iis06P02) of this Proficiency Test on Rubber/Compound 

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Summary of this proficiency test:

On 14 June '06, the proficiency test Rubber/Compound (iis06P02) was finished. It started on 5 April '06 (see message “Proficiency Test on Rubber/Compound started” on this website) when the samples were distributed.

In this international interlaboratory study 16 laboratories in 9 different countries have participated. The participants were asked to determine on pre-cured (vulcanized slabs) and uncured compounds, ISO methods: Tensile Properties (Tensile strength, modulus 100%, 200% and 300%), Elongation at break, Tear test and Hardness. Extra analysis on uncured compounds: Vulcanisation charateristics (MDR (Mh, M1, Ts1, Ts2, TC10, TC25, TC 50, TC90, TC95)). Analysis on raw rubber: Mooney Viscosity (MML + UML(1+4)100 oC).

The proficiency test report summarises per test, the test results, the analytical methods reported by the participants and the z-scores calculated by i.i.s. for each participant are tabulated. Also, for each test, the calculated summary (e.g. mean, standard deviation and reproducibility) is given.

In the report also an evaluation of the test results is given. Problems encountered in the analyses are mentioned and - where possible - suggestions for quality improvement are formulated. For each test a comparison is made between the results of the group of participants and the requirements given by the relevant standard (e.g. ISO, DIN, ASTM).

Interested parties can order a hard copy of the report; the price for non-participants is Euro 35.