{"id":15500,"date":"2024-09-22T11:53:53","date_gmt":"2024-09-22T08:23:53","guid":{"rendered":"https:\/\/imenpol.com\/blog\/en\/?p=15500"},"modified":"2025-09-16T11:59:04","modified_gmt":"2025-09-16T08:29:04","slug":"how-to-perform-a-cup-test","status":"publish","type":"post","link":"https:\/\/imenpol.com\/blog\/en\/educational\/how-to-perform-a-cup-test\/","title":{"rendered":"How to perform a cup test?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"15500\" class=\"elementor elementor-15500\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-61edf14 e-flex e-con-boxed e-con e-parent\" data-id=\"61edf14\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7191e04 content-table elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"7191e04\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;headings_by_tags&quot;:[&quot;h2&quot;,&quot;h3&quot;],&quot;container&quot;:&quot;.table-contents&quot;,&quot;exclude_headings_by_selector&quot;:[],&quot;no_headings_message&quot;:&quot;No headings were found on this page.&quot;,&quot;marker_view&quot;:&quot;numbers&quot;,&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<h6 class=\"elementor-toc__header-title\">\n\t\t\t\tTable of contents\t\t\t<\/h6>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__7191e04\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__7191e04\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__7191e04\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<svg class=\"elementor-toc__spinner eicon-animation-spin e-font-icon-svg e-eicon-loading\" aria-hidden=\"true\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M500 975V858C696 858 858 696 858 500S696 142 500 142 142 304 142 500H25C25 237 238 25 500 25S975 237 975 500 763 975 500 975Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-62d24ad  table-contents e-flex e-con-boxed e-con e-parent\" data-id=\"62d24ad\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a6889dc elementor-widget elementor-widget-text-editor\" data-id=\"a6889dc\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>This foaming process is also called hand mixing. It is used as a simple method of evaluating foaming systems for comparison of raw materials and resulting foam properties. In other word, a small-scale method to measure the quality of polyurethane foam is to preform cup tests. Based on the optimum formulation obtained by cup foaming, scale-up foaming processes, are employed.\u00a0<\/p><p>In the first place, it is important to review the Safety Data Sheets (SDSs) for the materials that are going to be mixed. Then, after preparing the essential equipment and supplies small size samples (cup-tests) can be carried out.<\/p><p>Supplies you will need:<\/p><ul><li>plastic cups<\/li><li>solvent-resistant gloves<\/li><li>stopwatch<\/li><li>digital scale<\/li><li>thermometer<\/li><li>wooden needle (or spatula)<\/li><li>mechanical stirrer<\/li><li>suitable solvent (e.g. methylene chloride)<\/li><li>a knife (to cut the foam for density measurement)<\/li><\/ul><p>Before starting the process, inspect all equipment. Ensure that all supplies are in proper working condition, and meet materials compatibility requirements. Now, the test steps can be done sequentially as follows.<\/p><p>The foaming procedure are:<\/p><h2><u>1. Step one: weigh the components<\/u><\/h2><p>At first, some calculation is needed to find out exact amount of each component. Thereafter, weighing the components is performed. In cases where a physical blowing agent is required, a mixture of polyol with the physical blowing agent is prepared with an exact ratio. Weigh required amount of the polyol component, successively add the blowing agent into the polyol with gentle stirring with a spatula.<\/p><p>When the blowing agent is added to the polyol and stirred with a mechanical stirrer, a portion of it evaporates, so its loss should be adjusted by adding more blowing agent. The addition and stirring are repeated to reach an exact amount.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-2433c86 e-flex e-con-boxed e-con e-parent\" data-id=\"2433c86\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-8a08de9 elementor-widget elementor-widget-image\" data-id=\"8a08de9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"820\" src=\"https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2024\/09\/digital-scale.jpg\" class=\"attachment-full size-full wp-image-15504\" alt=\"\" srcset=\"https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2024\/09\/digital-scale.jpg 800w, https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2024\/09\/digital-scale-293x300.jpg 293w, https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2024\/09\/digital-scale-768x787.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b9639d5  table-contents e-flex e-con-boxed e-con e-parent\" data-id=\"b9639d5\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b019247 elementor-widget elementor-widget-text-editor\" data-id=\"b019247\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><u>2. Step two: mix polyol blend with isocyanate<\/u><\/h2><p>Prepare the appropriate amount of isocyanate needed for your formulation in a separate cup. Check the temperature of the polyol blend with a thermometer to ensure that it is at your required processing temperature, as differences in temperature can affect the reaction times. Thereafter, pour the isocyanate component into the polyol-containing blend and mix it with a mechanical stirrer. Now, pour the mixture into a second cup and let the foam to rise freely.<\/p><p>Clean the stirrer immediately after mixing by using methylene chloride or other solvents.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-264a792 e-flex e-con-boxed e-con e-parent\" data-id=\"264a792\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9a63d69 elementor-widget elementor-widget-image\" data-id=\"9a63d69\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"258\" height=\"339\" src=\"https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2024\/09\/mixing-polyol-blend-with-isocyanate.jpg\" class=\"attachment-full size-full wp-image-15505\" alt=\"\" srcset=\"https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2024\/09\/mixing-polyol-blend-with-isocyanate.jpg 258w, https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2024\/09\/mixing-polyol-blend-with-isocyanate-228x300.jpg 228w\" sizes=\"(max-width: 258px) 100vw, 258px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-85976ad  table-contents e-flex e-con-boxed e-con e-parent\" data-id=\"85976ad\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-86a015b elementor-widget elementor-widget-text-editor\" data-id=\"86a015b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<h2><u>3. Step three: measure the characteristic times<\/u><\/h2><p>Overall, there are four important timings during polyurethane foam formation:<\/p><ul><li><strong>Cream Time:<\/strong> The period of time between initial mixing of starting components and the first visible reaction in the form of creaminess of the reaction mixture is called cream time. At this time, the mixture starts to expand.<\/li><li><strong>Gel Time:<\/strong> The viscosity of the foaming liquid increases with reaction time due to the cross-linking reactions. To test for gel, touch the foam with a spatula and pull away; a thread will form between the spatula and the foam.<\/li><li><strong>Rise Time:<\/strong> The time interval between the start of the final mixing and the time of complete expansion of the foaming mass.<\/li><\/ul><p><strong>Tack-free time:<\/strong> The time interval between pouring the liquid mixture into the cup and the time when the surface of the foam does not show stickiness when touched. This means that chemical reactions have been completed.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c708ffd e-flex e-con-boxed e-con e-parent\" data-id=\"c708ffd\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e696aa8 elementor-widget elementor-widget-image\" data-id=\"e696aa8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2024\/09\/CORNOMETR.jpg\" class=\"attachment-full size-full wp-image-15506\" alt=\"\" srcset=\"https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2024\/09\/CORNOMETR.jpg 800w, https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2024\/09\/CORNOMETR-300x300.jpg 300w, https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2024\/09\/CORNOMETR-150x150.jpg 150w, https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2024\/09\/CORNOMETR-768x768.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-418e177  table-contents e-flex e-con-boxed e-con e-parent\" data-id=\"418e177\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-0e4bd01 elementor-widget elementor-widget-text-editor\" data-id=\"0e4bd01\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>To sum up, the cup test results are:<\/p><ul><li>Reaction times<\/li><li>Free rise density<\/li><li>Appearance (foam skin and cellular structure)<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b0715e8 e-flex e-con-boxed e-con e-parent\" data-id=\"b0715e8\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-bcb0656 elementor-widget elementor-widget-image\" data-id=\"bcb0656\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img loading=\"lazy\" decoding=\"async\" width=\"1881\" height=\"661\" src=\"https:\/\/imenpol.com\/blog\/en\/wp-content\/uploads\/sites\/2\/2024\/09\/performing-a-cup-test.gif\" class=\"attachment-full size-full wp-image-15507\" alt=\"\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>The cup test measures polyurethane foam properties through hand mixing. Gather supplies like cups, gloves, and a scale. Weigh the polyol and blowing agents, then mix with isocyanate at the correct temperature. Key timings to note are cream time (start of expansion), gel time (thickening), rise time (full expansion), and tack-free time (when the foam surface is no longer sticky). Finally, evaluate reaction times, density, and appearance.<\/p>\n","protected":false},"author":4,"featured_media":15502,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[87,85,62],"class_list":["post-15500","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-educational","tag-catalyst","tag-polyurethane-foam-articles","tag-solvent"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to perform a cup test? - Imenpol blog<\/title>\n<meta name=\"description\" content=\"Imenpol blog\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/imenpol.com\/blog\/en\/educational\/how-to-perform-a-cup-test\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to perform a cup test? 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