In a collaborative research project called "Consumer Oriented Solids Transport Technology" (COSTT), a uniaxial caking tester was developed to measure the caking propensity of bulk solids under controlled environmental conditions. To validate the results gained from this tester, a series of round robin tests were run, using an organic acid of known humidity dependence as test material. These tests showed that even seemingly minor deviations in the test procedure can cause significant deviations in the measured uniaxial strength. This paper gives an indication of the level of details required to run a reliable caking test and the obtainable reproducibility.

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