ISO/TC 35/SC 9

Project No.ISO/TR 20659-2:2024
Title<p class="MsoBodyText"><span lang="EN-GB">This document gives information on an interlaboratory comparison for the determination of the time-dependent structural change (thixotropy) using rheological test methods. Thixotropy is the reversible, time-dependent decrease of shear viscosity <em style="mso-bidi-font-style: normal;">η</em> at a constant shear rate </span><!-- [if gte msEquation 12]><m:oMath><m:acc><m:accPr><m:chr m:val="˙"/><span style='font-family:"Cambria Math",serif;mso-ascii-font-family: "Cambria Math";mso-hansi-font-family:"Cambria Math"'><m:ctrlPr></m:ctrlPr></span></m:accPr><m:e><i style='mso-bidi-font-style:normal'><span lang=EN-GB style='font-family:"Cambria Math",serif'><m:r>γ</m:r></span></i></m:e></m:acc></m:oMath><![endif]--><!-- [if !msEquation]--><span style="font-size: 11.0pt; line-height: 107%; font-family: 'Calibri',sans-serif; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-hansi-theme-font: minor-latin; mso-bidi-font-family: 'Times New Roman'; mso-bidi-theme-font: minor-bidi; position: relative; top: 2.5pt; mso-text-raise: -2.5pt; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;"> </span><!--[endif]--><span lang="EN-GB">or shear stress <em style="mso-bidi-font-style: normal;">τ</em>.</span></p> <p class="MsoBodyText"><span lang="EN-GB">This document provides examples of fields of application, in which important material properties can be characterized by the thixotropy. These fields of application include:</span></p> <p class="ListContinue1" style="mso-list: l0 level1 lfo1;"><!-- [if !supportLists]--><span lang="EN-GB" style="mso-fareast-font-family: Cambria; mso-bidi-font-family: Cambria;"><span style="mso-list: Ignore;">—<span style="font: 7.0pt 'Times New Roman';">     </span></span></span><!--[endif]--><span lang="EN-GB">effectiveness of rheological additives and thixotropic agents, respectively;</span></p> <p class="ListContinue1" style="mso-list: l0 level1 lfo1;"><!-- [if !supportLists]--><span lang="EN-GB" style="mso-fareast-font-family: Cambria; mso-bidi-font-family: Cambria;"><span style="mso-list: Ignore;">—<span style="font: 7.0pt 'Times New Roman';">     </span></span></span><!--[endif]--><span lang="EN-GB">stability of the structure at rest (e.g. behaviour when starting to pump);</span></p> <p class="ListContinue1" style="mso-list: l0 level1 lfo1;"><!-- [if !supportLists]--><span lang="EN-GB" style="mso-fareast-font-family: Cambria; mso-bidi-font-family: Cambria;"><span style="mso-list: Ignore;">—<span style="font: 7.0pt 'Times New Roman';">     </span></span></span><!--[endif]--><span lang="EN-GB">wet film thickness after processing;</span></p> <p class="ListContinue1" style="mso-list: l0 level1 lfo1;"><!-- [if !supportLists]--><span lang="EN-GB" style="mso-fareast-font-family: Cambria; mso-bidi-font-family: Cambria;"><span style="mso-list: Ignore;">—<span style="font: 7.0pt 'Times New Roman';">     </span></span></span><!--[endif]--><span lang="EN-GB">levelling and sagging behaviour (e.g. without brushmarks or sag formation);</span></p> <p class="ListContinue1" style="mso-list: l0 level1 lfo1;"><!-- [if !supportLists]--><span lang="EN-GB" style="mso-fareast-font-family: Cambria; mso-bidi-font-family: Cambria;"><span style="mso-list: Ignore;">—<span style="font: 7.0pt 'Times New Roman';">     </span></span></span><!--[endif]--><span lang="EN-GB">orientation of effect pigments.</span></p>
Registration number (WIID)86378
Scope<p class="MsoBodyText"><span lang="EN-GB">This document gives information on an interlaboratory comparison for the determination of the time-dependent structural change (thixotropy) using rheological test methods. Thixotropy is the reversible, time-dependent decrease of shear viscosity <em style="mso-bidi-font-style: normal;">η</em> at a constant shear rate </span><!-- [if gte msEquation 12]><m:oMath><m:acc><m:accPr><m:chr m:val="˙"/><span style='font-family:"Cambria Math",serif;mso-ascii-font-family: "Cambria Math";mso-hansi-font-family:"Cambria Math"'><m:ctrlPr></m:ctrlPr></span></m:accPr><m:e><i style='mso-bidi-font-style:normal'><span lang=EN-GB style='font-family:"Cambria Math",serif'><m:r>γ</m:r></span></i></m:e></m:acc></m:oMath><![endif]--><!-- [if !msEquation]--><span style="font-size: 11.0pt; line-height: 107%; font-family: 'Calibri',sans-serif; mso-ascii-theme-font: minor-latin; mso-fareast-font-family: 'Times New Roman'; mso-fareast-theme-font: minor-fareast; mso-hansi-theme-font: minor-latin; mso-bidi-font-family: 'Times New Roman'; mso-bidi-theme-font: minor-bidi; position: relative; top: 2.5pt; mso-text-raise: -2.5pt; mso-ansi-language: EN-US; mso-fareast-language: EN-US; mso-bidi-language: AR-SA;"> </span><!--[endif]--><span lang="EN-GB">or shear stress <em style="mso-bidi-font-style: normal;">τ</em>.</span></p> <p class="MsoBodyText"><span lang="EN-GB">This document provides examples of fields of application, in which important material properties can be characterized by the thixotropy. These fields of application include:</span></p> <p class="ListContinue1" style="mso-list: l0 level1 lfo1;"><!-- [if !supportLists]--><span lang="EN-GB" style="mso-fareast-font-family: Cambria; mso-bidi-font-family: Cambria;"><span style="mso-list: Ignore;">—<span style="font: 7.0pt 'Times New Roman';">     </span></span></span><!--[endif]--><span lang="EN-GB">effectiveness of rheological additives and thixotropic agents, respectively;</span></p> <p class="ListContinue1" style="mso-list: l0 level1 lfo1;"><!-- [if !supportLists]--><span lang="EN-GB" style="mso-fareast-font-family: Cambria; mso-bidi-font-family: Cambria;"><span style="mso-list: Ignore;">—<span style="font: 7.0pt 'Times New Roman';">     </span></span></span><!--[endif]--><span lang="EN-GB">stability of the structure at rest (e.g. behaviour when starting to pump);</span></p> <p class="ListContinue1" style="mso-list: l0 level1 lfo1;"><!-- [if !supportLists]--><span lang="EN-GB" style="mso-fareast-font-family: Cambria; mso-bidi-font-family: Cambria;"><span style="mso-list: Ignore;">—<span style="font: 7.0pt 'Times New Roman';">     </span></span></span><!--[endif]--><span lang="EN-GB">wet film thickness after processing;</span></p> <p class="ListContinue1" style="mso-list: l0 level1 lfo1;"><!-- [if !supportLists]--><span lang="EN-GB" style="mso-fareast-font-family: Cambria; mso-bidi-font-family: Cambria;"><span style="mso-list: Ignore;">—<span style="font: 7.0pt 'Times New Roman';">     </span></span></span><!--[endif]--><span lang="EN-GB">levelling and sagging behaviour (e.g. without brushmarks or sag formation);</span></p> <p class="ListContinue1" style="mso-list: l0 level1 lfo1;"><!-- [if !supportLists]--><span lang="EN-GB" style="mso-fareast-font-family: Cambria; mso-bidi-font-family: Cambria;"><span style="mso-list: Ignore;">—<span style="font: 7.0pt 'Times New Roman';">     </span></span></span><!--[endif]--><span lang="EN-GB">orientation of effect pigments.</span></p>
StatusStandarts spēkā
ICS group87.040