{"id":371882,"date":"2024-10-20T02:26:45","date_gmt":"2024-10-20T02:26:45","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-iso-219012021\/"},"modified":"2024-10-26T04:15:21","modified_gmt":"2024-10-26T04:15:21","slug":"bs-iso-219012021","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-iso-219012021\/","title":{"rendered":"BS ISO 21901:2021"},"content":{"rendered":"<p>This document specifies a periodic heat method for measurement of the thermal diffusivity of thermal insulation material in the shape of a flat plate.<\/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>6<b><\/td>\n<td>Foreword  <\/td>\n<\/tr>\n<tr>\n<td><b>7<b><\/td>\n<td>1 Scope <br \/> 2 Normative references <br \/> 3 Terms and definitions  <\/td>\n<\/tr>\n<tr>\n<td><b>8<b><\/td>\n<td>4 Symbols  <\/td>\n<\/tr>\n<tr>\n<td><b>9<b><\/td>\n<td>5 Principle <br \/> 5.1 General <br \/> 5.2 Calculation of thermal diffusivity  <\/td>\n<\/tr>\n<tr>\n<td><b>12<b><\/td>\n<td>6 Test specimen <br \/> 6.1 Sample <br \/> 6.2 Details of test specimen  <\/td>\n<\/tr>\n<tr>\n<td><b>13<b><\/td>\n<td>6.3 Machining of test specimen <br \/> 6.3.1 When using two test specimens <br \/> 6.3.2 When using a single test specimen  <\/td>\n<\/tr>\n<tr>\n<td><b>14<b><\/td>\n<td>7 Apparatus <br \/> 7.1 General  <\/td>\n<\/tr>\n<tr>\n<td><b>15<b><\/td>\n<td>7.2 Temperature measurement instrument <br \/> 8 Procedure <br \/> 8.1 Rounding numbers <br \/> 8.2 Period of temperature change  <\/td>\n<\/tr>\n<tr>\n<td><b>16<b><\/td>\n<td>8.3 Amplitude of temperature change <br \/> 8.4 Measurement method  <\/td>\n<\/tr>\n<tr>\n<td><b>17<b><\/td>\n<td>8.5 Calculation of thermal diffusivity <br \/> 8.6 Calculation of thermal conductivity <br \/> 9 Test report  <\/td>\n<\/tr>\n<tr>\n<td><b>18<b><\/td>\n<td>Annex A (normative) Size of test specimen and period of temperature change  <\/td>\n<\/tr>\n<tr>\n<td><b>21<b><\/td>\n<td>Annex B (informative) Measurement considerations  <\/td>\n<\/tr>\n<tr>\n<td><b>22<b><\/td>\n<td>Bibliography  <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"<p><b>Thermal insulation. Test method for thermal diffusivity. Periodic heat 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>24<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":371889,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2641],"product_tag":[],"class_list":{"0":"post-371882","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-bsi","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/371882","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\/371889"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=371882"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=371882"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=371882"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}