By Brown, Roger P.
This file is an output from the Weathering of Elastomers and Sealants venture, which kinds a part of the united kingdom governmentвЂ™s division of exchange and IndustryвЂ™s Degradation of fabrics in competitive Environments Programme.
A long term typical getting old programme was once all started in 1958 while 19 rubber compounds have been uncovered at three destinations. the ultimate units of attempt items have been withdrawn in 1998 giving a complete of forty years of usual getting older. the result of the actual assessments performed at periods over the interval have been released in 2000 by way of Rapra in 'Natural growing old of RubberвЂ”Changes in actual homes over forty Years'.
This file info the result of sped up warmth getting older experiences undertaken on re-mixed samples of these fabrics studied for the common ageing research and at the 20 new compounds selected to symbolize polymers now not to be had in 1958 and to mirror alterations in compounding perform.
In addition to these homes studied for the unreal weathering exposures, compression set and dynamic homes have been additionally measured.
The result of a lot of these assessments are back provided graphically and tabulated, permitting the speed of degradation of houses to be undefined. because the variety of graphs are too voluminous to be reproduced in overall, these for hardness, tensile energy, elongation at holiday and a hundred% modulus are given.
Extrapolation of the sped up effects to longer occasions at reduce temperatures was once tried by means of methods вЂ“ the Arrhenius relation and the WLF equation вЂ“ and compression set effects analysed utilizing a dose price equation. Predictions are made for switch at 230C and 400C to equate to long term typical getting older lower than temperate and scorching dry stipulations.
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Extra info for Ageing of Rubber & Accelerated Heat Ageing Test Results
Compound P1 Blend of two EPDM copolymers, one with high ethylene content and medium Mooney viscosity, the other with medium ethylene content and low Mooney viscosity. Contains carbon black, zinc oxide, TMQ, paraffinic process oil, dicumyl peroxide and a sulphur donor.
Hawley, Ageing of Rubber—Accelerated Weathering and Ozone Test Results, Rapra Technology Limited, 2001. 3. ISO 37 1994 Rubber, vulcanised or thermoplastic—Determination of tensile stress-strain properties. 4. ISO 48 1994 Rubber, vulcanised or thermoplastic—Determination of hardness. 5. ISO 815 1991 Rubber, vulcanised or thermoplastic—Determination of compression set at ambient, elevated or low temperatures 6. ISO 4664 1998 Rubber—Determination of dynamic properties of vulcanisates for classification purposes (by forced sinusoidal shear strain).
Brown and T. Butler, Natural Ageing of Rubber—Changes in Physical Properties over 40 Years, Rapra Technology Limited, 2000. 2. P. Brown, T. W. Hawley, Ageing of Rubber—Accelerated Weathering and Ozone Test Results, Rapra Technology Limited, 2001. 3. ISO 37 1994 Rubber, vulcanised or thermoplastic—Determination of tensile stress-strain properties. 4. ISO 48 1994 Rubber, vulcanised or thermoplastic—Determination of hardness. 5. ISO 815 1991 Rubber, vulcanised or thermoplastic—Determination of compression set at ambient, elevated or low temperatures 6.