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Studies and DevelopmentsInteresting studies have been done during 2010 regarding the relationshipbetween IRHD hardness reading and sample thickness.The research project has been done in cooperation among GibitreInstruments, Pirelli Automotive Milan Research Laboratory,Bridgestone Rome Research Laboratory, University of Physics ofNaples.The aim of the project was the investigation of mathematical models to correcthardness reading according to the real thickness of the sampleThe starting point for the research has been the UNI 7319 standard developedin 1974 by Dr. Bassi. The Standard provided empiric correction curves.The study has identified mathematical models which provide successfulcorrection within limited sample variations and can provide interestingpossibilities to incorporate in future software version the correction fortests on non-standard samples.