Brown R.P., Butler T., Hawley S.W. Ageing of Rubber. Accelerated Heat Ageing. Test Results

Rapra Technology Limited, 2001. — 218 p. — ISBN: 1-85957-274-X.A long-term natural ageing programme was started in 1958 when 19 rubber compounds were exposed at 3 locations. The final sets of test pieces were withdrawn in 1998 giving a total of 40 years of natural ageing. The results of the physical tests carried out at intervals over the 40 years have been published.
The 19 compounds were re-mixed in 1999–2000 in order that accelerated ageing tests could be carried out for direct comparison with the results from natural ageing. A total of 20 new compounds were also mixed to represent polymers not available in 1958 and to reflect changes in compounding practice. Ten of these materials were formulations directly nominated by industry covering materials of current interest to particular companies. The 39 materials were subjected to accelerated heat ageing for a series of times and temperatures, artificial weathering and exposure to ozone. This report details the results of the accelerated heat ageing tests and their analysis for the prediction of changes after long-term natural ageing. The accelerated weathering and ozone test results have been published separately.Materials
Original Materials
New Materials
Preparation of Test Pieces
Physical Tests
Exposure of Test Pieces
Results
Presentation
Uncertainty
Prediction of Natural Ageing
Discussion
Change with Time
Predictions
ConclusionsCompound Details
Accelerated Heat Ageing Results
Compression Set Results
Example Graphs