Brown R.P., Butler T., Hawley S.W. Ageing of Rubber. Accelerated weathering and ozone test results

Shrewsbury. - Rapra Technology Limited. - 2001. — 198 p.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 The final sets of test pieces were withdrawn in 1998 giving a total of 40 years of natural ageing.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 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 artificial weathering and ozone exposure tests and makes comparisons with the results after natural ageing. The accelerated heat ageing results will be published separately (Ageing of Rubber. Accelerated Heat Ageing Results).Содержание:Materials
Preparation of test pieces
Physical tests
Exposure of test pieces
Weathering results (Appendix 2)
Ozone results (Appendix 3)
Discussion
ConclusionsAppendix 1 - Compound details
Appendix 2 - Weathering results
New compounds
Participant’s compounds
Appendix 3 - Ozone results