Rubber Process Analyser, RPA (e.g. Payne effect)

The RPA (Rubber Process Analyser) is a dynamic mechanical rheological tester developed to analyse raw elastomers and unvulcanised compounds. The machine can make measurements up to 230°C, from 0.02 to 50 Hz and from 1 tot 1250% elongation. It is often used to determine the Payne effect, amongst other things.


The Payne effect is the difference in modulus at relatively low elongation rates. The difference is caused by 'filler-filler interaction'. During mixing, the filler should be dispersed homogeneously through the compound, which indicates a break-up of agglomerates into primary particles, resulting in a filler network within the polymer network.


For example, silica has a higher filler-filler interaction than carbon black.


The test is carried out according to the ERT inhouse method 403 unless otherwise desired.


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