By Brown, Roger P.
This document is an output from the Weathering of Elastomers and Sealants undertaking, 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 growing older programme was once all started in 1958 whilst 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 the ultimate units of attempt items have been withdrawn in 1998 giving a complete of forty years of traditional growing older. the result of the actual checks conducted at durations over the interval have been released in 2000 through Rapra in 'Natural aging of RubberвЂ”Changes in actual homes over forty Years'.
This document info the result of speeded up warmth growing old experiences undertaken on re-mixed samples of these fabrics studied for the average getting older research and at the 20 new compounds selected to symbolize polymers now not on hand 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 these types of checks 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 power, elongation at holiday and a hundred% modulus are given.
Extrapolation of the speeded up effects to longer occasions at reduce temperatures used to be tried via methods вЂ“ the Arrhenius relation and the WLF equation вЂ“ and compression set effects analysed utilizing a dose fee equation. Predictions are made for swap at 230C and 400C to equate to long term normal growing older below temperate and sizzling dry stipulations.
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Extra resources for Ageing of Rubber & Accelerated Heat Ageing Test Results
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. Contains carbon black, zinc oxide, TMQ, paraffinic process oil, dicumyl peroxide and a sulphur donor.
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. 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.
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. ISO 4664 1998 Rubber—Determination of dynamic properties of vulcanisates for classification purposes (by forced sinusoidal shear strain).