Abstract
Many Interlaboratory Test Programs, ITPs, on rubber test methods, have been carried out during the last years. ITPs have been organized within ISO TC 45 and also in several countries such as USA, UK and Sweden. Most of these ITPs have shown that the repeatability and the reproduceability are poor for many rubber test methods. In an attempt to do more than just determine the poor precision, we chose four methods and decided to study them to identify the factors giving poor precision, thereby improving the methods. This second part contains the work done on heat ageing tests. The results from the project show the temperature and air speed to be the most critical factors. A good ageing oven must therefore have accurate temperature in time and space, low air speed dependent on the air exchange rate only and means of controlling the air exchange rate.
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