By Brown, Roger P.
This record is an output from the Weathering of Elastomers and Sealants undertaking, 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 growing older programme used to be all started in 1958 whilst 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 the ultimate units of try items have been withdrawn in 1998 giving a complete of forty years of normal growing old. the result of the actual exams conducted at periods over the interval have been released in 2000 by means of Rapra in 'Natural ageing of RubberвЂ”Changes in actual homes over forty Years'.
This file information the result of speeded up warmth aging stories undertaken on re-mixed samples of these fabrics studied for the ordinary growing older examine and at the 20 new compounds selected to symbolize polymers no longer to be had in 1958 and to mirror adjustments in compounding perform.
In addition to these houses studied for the unreal weathering exposures, compression set and dynamic homes have been additionally measured.
The result of most of these assessments are back offered graphically and tabulated, permitting the speed of decay 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 was once tried by means of techniques 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 average ageing lower than temperate and sizzling dry stipulations.
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Additional resources for Ageing of Rubber & Accelerated Heat Ageing Test Results
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. Contains carbon black, zinc oxide, TMQ, paraffinic process oil, dicumyl peroxide and a sulphur donor.
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).
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. ISO 4664 1998 Rubber—Determination of dynamic properties of vulcanisates for classification purposes (by forced sinusoidal shear strain).