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 alternate and IndustryвЂ™s Degradation of fabrics in competitive Environments Programme.
A long term normal getting older programme used to be begun in 1958 while 19 rubber compounds have been uncovered at three destinations. the ultimate units of try items have been withdrawn in 1998 giving a complete of forty years of typical getting old. the result of the actual checks conducted at durations over the interval have been released in 2000 via Rapra in 'Natural ageing of RubberвЂ”Changes in actual houses over forty Years'.
This document info the result of sped up warmth growing older reports undertaken on re-mixed samples of these fabrics studied for the normal getting older learn and at the 20 new compounds selected to symbolize polymers no longer on hand in 1958 and to mirror alterations in compounding perform.
In addition to these houses studied for the factitious weathering exposures, compression set and dynamic houses have been additionally measured.
The result of these kind of assessments are back awarded 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 speeded up effects to longer instances at reduce temperatures used to be tried through ways вЂ“ the Arrhenius relation and the WLF equation вЂ“ and compression set effects analysed utilizing a dose price equation. Predictions are made for swap at 230C and 400C to equate to long term common growing old less than temperate and sizzling dry stipulations.
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Extra resources for Ageing of Rubber & Accelerated Heat Ageing Test Results
ISO 188 1998 Rubber, vulcanised—Accelerated ageing or heat resistance tests. 8. P. Brown, Practical Guide to the Assessment of the Useful Life of Rubbers, Rapra Technology Limited, 2001. 5 SRF black 30 Precipitated calcium carbonate 90 Low volatile process oil 8 Robac 22 1 Zinc oxide 25 28 Ageing of Rubber - Accelerated Heat Ageing Test Results Nitrile Rubber Nitrile Rubber Compound P - General Purpose Ingredient Amount (pphr) Nitrile rubber 100 Curing conditions: 40' @ 153 °C Compound R - Good Ageing (ca.
5 Nitrile rubber 100 Curing conditions: 30' @ 153 °C (ca. 5' @ 141 °C black loading, sulphur, TMTD, CBS and stabilised. Details confidential. 5' @ 165 °C FEF N550 Black 40 DBP 5 Stearic Acid 1 Dicup 40C 3 Rhenogran TAC50 2 32 Ageing of Rubber - Accelerated Heat Ageing Test Results Participants’ Compounds Participants' Compounds Details of most of the formulations are not disclosed. 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.
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.