New PDF release: Ageing of Rubber & Accelerated Heat Ageing Test Results

By Brown, Roger P.

ISBN-10: 185957274X

ISBN-13: 9781859572740

ISBN-10: 1859573487

ISBN-13: 9781859573488

This document is an output from the Weathering of Elastomers and Sealants undertaking, which varieties a part of the united kingdom government’s division of alternate and Industry’s Degradation of fabrics in competitive Environments Programme.

A long term typical getting 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 the ultimate units of attempt items have been withdrawn in 1998 giving a complete of forty years of common getting old.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 getting older of Rubber—Changes in actual houses over forty Years'.

This file information the result of speeded up warmth growing older 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 now not on hand in 1958 and to mirror alterations in compounding perform.

In addition to these homes studied for the synthetic weathering exposures, compression set and dynamic homes have been additionally measured.

The result of a majority of these checks are back offered 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 was once tried by means of ways – the Arrhenius relation and the WLF equation – and compression set effects analysed utilizing a dose cost equation. Predictions are made for swap at 230C and 400C to equate to long term usual getting old less than temperate and sizzling dry stipulations.

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Additional resources for Ageing of Rubber & Accelerated Heat Ageing Test Results

Sample text

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.

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.

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).

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


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