{"id":382351,"date":"2024-10-20T03:15:43","date_gmt":"2024-10-20T03:15:43","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-iso-209652021-tc\/"},"modified":"2024-10-26T05:55:59","modified_gmt":"2024-10-26T05:55:59","slug":"bs-iso-209652021-tc","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-iso-209652021-tc\/","title":{"rendered":"BS ISO 20965:2021 &#8211; TC"},"content":{"rendered":"<p>This document specifies the general principles of a method for determining the transient extensional viscosity of polymer melts. The procedure details the measurement of polymer melt specimens stretched uniaxially under conditions of constant strain rate and constant temperature.<\/p>\n<p>The method is capable of measuring the transient extensional viscosity of polymer melts at Hencky strain rates typically in the range 0,01&nbsp;s<sup>\u20131<\/sup> to 1&nbsp;s<sup>\u20131<\/sup>, at Hencky strains up to approximately 4 and at temperatures up to approximately 250&nbsp;\u00b0C (see NOTEs&nbsp;1 and&nbsp;2). It is suitable for measuring transient extensional viscosity values typically in the range from approximately 10<sup>4<\/sup>&nbsp;Pa?s to 10<sup>7<\/sup>&nbsp;Pa?s (see NOTE&nbsp;3).<\/p>\n<div class=\"non-normative-note\">\n<div class=\"note-label\">\n  NOTE&nbsp;1\n <\/div>\n<p>Hencky strains and strain rates are used (see <span class=\"xref\">Clause&nbsp;3<\/span>).<\/p>\n<\/div>\n<div class=\"non-normative-note\">\n<div class=\"note-label\">\n  NOTE&nbsp;2\n <\/div>\n<p>Values of strain, strain rate and temperature outside these limiting values can be attained.<\/p>\n<\/div>\n<div class=\"non-normative-note\">\n<div class=\"note-label\">\n  NOTE&nbsp;3\n <\/div>\n<p>The operating limit of an instrument, in terms of the lowest transient extensional viscosity values that can be measured, is due to a combination of factors, including the ability of the specimen to maintain its shape during testing and the resolution of the instrument.<\/p>\n<\/div>\n<h4>PDF Catalog<\/h4>\n<table border=\"1px\" class=\"des-table\">\n<tr>\n<th>PDF Pages<\/th>\n<th>PDF Title<\/th>\n<\/tr>\n<tr>\n<td><b>30<b><\/td>\n<td>undefined  <\/td>\n<\/tr>\n<tr>\n<td><b>34<b><\/td>\n<td>Foreword  <\/td>\n<\/tr>\n<tr>\n<td><b>35<b><\/td>\n<td>1 Scope <br \/> 2 Normative references <br \/> 3 Terms and definitions  <\/td>\n<\/tr>\n<tr>\n<td><b>37<b><\/td>\n<td>4 General principles <br \/> 5 Apparatus <br \/> 5.1 General description  <\/td>\n<\/tr>\n<tr>\n<td><b>39<b><\/td>\n<td>5.2 Silicon oil bath\/temperature-controlled chamber  <\/td>\n<\/tr>\n<tr>\n<td><b>40<b><\/td>\n<td>5.3 Temperature measurement and control <br \/> 5.4 Strain and strain rate measurement <br \/> 5.5 Force measurement <br \/> 5.6 Calibration  <\/td>\n<\/tr>\n<tr>\n<td><b>41<b><\/td>\n<td>6 Sampling and specimen preparation <br \/> 6.1 Sampling <br \/> 6.2 Specimen preparation <br \/> 6.3 Specimen mounting  <\/td>\n<\/tr>\n<tr>\n<td><b>42<b><\/td>\n<td>7 Procedure <br \/> 7.1 Specimen loading <br \/> 7.2 Pre-conditioning of the specimen <br \/> 7.3 Testing  <\/td>\n<\/tr>\n<tr>\n<td><b>43<b><\/td>\n<td>8 Analysis of extensional flow measurements <br \/> 8.1 Symbols used <br \/> 8.2 Analysis of extensional flow <br \/> 8.2.1 General  <\/td>\n<\/tr>\n<tr>\n<td><b>44<b><\/td>\n<td>8.2.2 Analysis for type A and B instruments (rotating clamps)  <\/td>\n<\/tr>\n<tr>\n<td><b>45<b><\/td>\n<td>8.2.3 Analysis for type C and D instruments (translating clamps) <br \/> 9 Precision  <\/td>\n<\/tr>\n<tr>\n<td><b>46<b><\/td>\n<td>10 Test report  <\/td>\n<\/tr>\n<tr>\n<td><b>47<b><\/td>\n<td>Annex A (informative)  Checking for swelling of specimens due to immersion in silicone oilor other fluids  <\/td>\n<\/tr>\n<tr>\n<td><b>48<b><\/td>\n<td>Annex B (informative)  Uncertainties in transient extensional viscosity testing  <\/td>\n<\/tr>\n<tr>\n<td><b>53<b><\/td>\n<td>Bibliography  <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p><b>Tracked Changes. Plastics. Determination of the transient extensional viscosity of polymer melts<\/b><\/p>\n<table class=\"shortdes-table\" style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/bsi\/\"><b>BSI<\/b><\/a><\/td>\n<td>2021<\/td>\n<td>54<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":382360,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[1177,2641],"product_tag":[],"class_list":{"0":"post-382351","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-83-080-01","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/382351","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/382360"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=382351"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=382351"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=382351"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}