By Brown, Roger P.
This record is an output from the Weathering of Elastomers and Sealants venture, which types a part of the united kingdom governmentвЂ™s division of exchange and IndustryвЂ™s Degradation of fabrics in competitive Environments Programme.
A long term common ageing programme used to be 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 the ultimate units of attempt items have been withdrawn in 1998 giving a complete of forty years of traditional getting old. the result of the actual checks performed at periods over the interval have been released in 2000 through Rapra in 'Natural growing older of RubberвЂ”Changes in actual houses over forty Years'.
This document information the result of speeded up warmth growing old experiences undertaken on re-mixed samples of these fabrics studied for the normal growing old research and at the 20 new compounds selected to symbolize polymers no longer to be had in 1958 and to mirror alterations in compounding perform.
In addition to these houses studied for the bogus weathering exposures, compression set and dynamic homes have been additionally measured.
The result of most of these checks are back provided graphically and tabulated, permitting the speed of decay of homes 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 speeded up effects to longer instances at reduce temperatures used to be tried via techniques вЂ“ the Arrhenius relation and the WLF equation вЂ“ and compression set effects analysed utilizing a dose fee equation. Predictions are made for switch at 230C and 400C to equate to long term average getting older lower than temperate and scorching dry stipulations.
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Additional resources for Ageing of Rubber & Accelerated Heat Ageing Test Results
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). 7. ISO 188 1998 Rubber, vulcanised—Accelerated ageing or heat resistance tests.
REFERENCES 1. P. 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.
Contains carbon black, zinc oxide, TMQ, paraffinic process oil, dicumyl peroxide and a sulphur donor.