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

By Brown, Roger P.

ISBN-10: 185957274X

ISBN-13: 9781859572740

ISBN-10: 1859573487

ISBN-13: 9781859573488

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

A long term usual getting older programme used to be begun in 1958 while 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 the ultimate units of attempt items have been withdrawn in 1998 giving a complete of forty years of usual getting old. the result of the actual assessments conducted at durations over the interval have been released in 2000 by way of Rapra in 'Natural getting older of Rubber—Changes in actual homes over forty Years'.

This record info the result of speeded up warmth getting older stories undertaken on re-mixed samples of these fabrics studied for the ordinary getting older research and at the 20 new compounds selected to symbolize polymers no longer to be had in 1958 and to mirror alterations in compounding perform.

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

The result of a lot of these assessments are back awarded graphically and tabulated, permitting the speed of degradation of homes 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 decrease temperatures used to be tried by means of ways – the Arrhenius relation and the WLF equation – and compression set effects analysed utilizing a dose fee equation. Predictions are made for switch at 230C and 400C to equate to long term typical ageing lower than temperate and scorching dry stipulations.

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

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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.

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).

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.

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


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