Download Ageing of Rubber & Accelerated Heat Ageing Test Results by Brown, Roger P. PDF

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 government’s division of exchange and Industry’s Degradation of fabrics in competitive Environments Programme.

A long term traditional growing old 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 the ultimate units of attempt items have been withdrawn in 1998 giving a complete of forty years of typical getting old. the result of the actual checks conducted at periods over the interval have been released in 2000 by way of Rapra in 'Natural growing older of Rubber—Changes in actual houses over forty Years'.

This record info the result of sped up warmth getting 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 homes studied for the factitious weathering exposures, compression set and dynamic homes have been additionally measured.

The result of these kinds of 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 sped up effects to longer occasions at reduce temperatures was once tried by means of techniques – the Arrhenius relation and the WLF equation – and compression set effects analysed utilizing a dose price equation. Predictions are made for switch at 230C and 400C to equate to long term ordinary growing old below temperate and scorching dry stipulations.

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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.

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.

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).

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