{"id":372434,"date":"2024-10-20T02:29:17","date_gmt":"2024-10-20T02:29:17","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-en-iso-6721-32021\/"},"modified":"2024-10-26T04:20:21","modified_gmt":"2024-10-26T04:20:21","slug":"bs-en-iso-6721-32021","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-en-iso-6721-32021\/","title":{"rendered":"BS EN ISO 6721-3:2021"},"content":{"rendered":"<p>This document specifies a bending-vibration method based upon resonance curves for determining the flexural complex modulus of homogeneous plastics and the damping properties of laminated plastics intended for acoustic insulation, for example systems consisting of a metal sheet coated with a damping plastic layer, or sandwich systems consisting of two sheet-metal layers with an intermediate plastic layer. For many purposes, it is useful to determine these properties as a function of temperature and frequency.<\/p>\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>2<b><\/td>\n<td>National foreword  <\/td>\n<\/tr>\n<tr>\n<td><b>4<b><\/td>\n<td>European foreword  <\/td>\n<\/tr>\n<tr>\n<td><b>6<b><\/td>\n<td>Foreword  <\/td>\n<\/tr>\n<tr>\n<td><b>7<b><\/td>\n<td>1 Scope <br \/> 2 Normative reference <br \/> 3 Terms and definitions <br \/> 4 Principle  <\/td>\n<\/tr>\n<tr>\n<td><b>8<b><\/td>\n<td>5 Test apparatus <br \/> 5.1 General <br \/> 5.2 Clamps or suspension fibres <br \/> 5.3 Exciter and detector  <\/td>\n<\/tr>\n<tr>\n<td><b>9<b><\/td>\n<td>5.4 Temperature-controlled enclosure <br \/> 5.5 Gas supply <br \/> 5.6 Temperature-measurement device <br \/> 5.7 Devices for measuring test specimen dimensions  <\/td>\n<\/tr>\n<tr>\n<td><b>10<b><\/td>\n<td>6 Test specimens <br \/> 6.1 General <br \/> 6.2 Shape and dimensions <br \/> 6.3 Preparation <br \/> 7 Number of test specimens  <\/td>\n<\/tr>\n<tr>\n<td><b>11<b><\/td>\n<td>8 Conditioning <br \/> 9 Procedure <br \/> 9.1 Test atmosphere <br \/> 9.2 Measurement of specimen cross-section <br \/> 9.3 Measurement of specimen density <br \/> 9.4 Mounting the test specimens and adjustment of the transducers <br \/> 9.4.1 Method A <br \/> 9.4.2 Method B <br \/> 9.4.3 Adjustment of the transducers <br \/> 9.5 Varying the temperature  <\/td>\n<\/tr>\n<tr>\n<td><b>12<b><\/td>\n<td>9.6 Varying the frequency <br \/> 9.7 Recording the resonance curve <br \/> 10 Expression of results <br \/> 10.1 Symbols  <\/td>\n<\/tr>\n<tr>\n<td><b>13<b><\/td>\n<td>10.2 Calculation of flexural storage modulus, E&#8217;f <br \/> 10.3 Calculation of flexural loss factor, tan \u03b4f <br \/> 10.4 Calculation of flexural loss modulus, E\u201df <br \/> 10.5 Plotting the complex modulus as a function of temperature  <\/td>\n<\/tr>\n<tr>\n<td><b>14<b><\/td>\n<td>11 Precision <br \/> 11.1 Storage modulus <br \/> 11.2 Loss factor <br \/> 11.3 Precision of the methods <br \/> 12 Test report  <\/td>\n<\/tr>\n<tr>\n<td><b>15<b><\/td>\n<td>Annex A (informative) Interlaboratory testing  <\/td>\n<\/tr>\n<tr>\n<td><b>18<b><\/td>\n<td>Bibliography  <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p><b>Plastics. Determination of dynamic mechanical properties &#8211; Flexural vibration. Resonance-curve method<\/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>20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":372443,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[1177,2641],"product_tag":[],"class_list":{"0":"post-372434","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\/372434","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\/372443"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=372434"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=372434"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=372434"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}