< p class=" MsoBodyText" style=" mso-layout-grid-align: none text-autospace: none " > < span lang=" EN-GB" style=" mso-bidi-font-size: 12.0pt mso-fareast-font-family: ' MS Mincho' " > This document describes two methods for measuring stress in tension under non-isothermal conditions.< / span>

< p class=" ListContinue1" > < span lang=" EN-GB" > —< span style=" mso-tab-count: 1 " >     < / span> Method A: The thermal stress is measured for various pre-strain and temperature conditions as a function of time.< / span>

< p class=" ListContinue1" > < span lang=" EN-GB" > —< span style=" mso-tab-count: 1 " >     < / span> Method B: The change of stress is measured in a test piece at a given strain and under variation of temperature at a given heating rate as a function of temperature. In this way, the determination of the thermal-mechanical behaviour of a rubber can be accelerated, e.g. for the purpose of comparative testing of aging or estimating the upper limit of the operating temperature.< / span>

< p class=" MsoBodyText" style=" mso-layout-grid-align: none text-autospace: none " > < span lang=" EN-GB" style=" mso-bidi-font-size: 12.0pt mso-fareast-font-family: ' MS Mincho' " > The measurement device, which is equipped with a suitable heating chamber, is used to record the stress as a function of time or temperature until the sample breaks or the stress has approached zero or for a certain time.< / span>