{"id":12792,"date":"2022-06-16T14:04:01","date_gmt":"2022-06-16T18:04:01","guid":{"rendered":"https:\/\/www.alpha-technologies.com\/?p=12792"},"modified":"2023-10-02T16:18:06","modified_gmt":"2023-10-02T20:18:06","slug":"dont-underestimate-the-importance-of-barrier-film","status":"publish","type":"post","link":"https:\/\/www.alphatechnologies.cn\/en\/blog\/dont-underestimate-the-importance-of-barrier-film\/","title":{"rendered":"The Importance of Barrier Film When Using a Rubber Process Analyzer."},"content":{"rendered":"\t\t
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Using the right film results in consistent, useable data and extends the life of your rubber process analyzer (RPA).<\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"Rheology\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<\/div>\n\t\t\t\t
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Author <\/p>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Simon Wan<\/h6>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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During testing at elevated processing or curing temperatures, compounds can release a variety of contaminants that can produce slippery surfaces, corrode dies and cause elastomer die seals to fail prematurely. These issues can cause data variation or artificial trends. It’s important to use barrier film to reduce these issues.<\/p>

It\u2019s kind of like a waffle iron: you have to have the right batter (compound) with the waffle iron (instrument) set at the right temperature (191\u00baC) , and a high-temperature oil. Otherwise, you can end up with batter stuck everywhere and nothing to show for it.<\/p>

Okay\u2026 that\u2019s a bit of stretch. But the point is that if you just put a rubber compound in the die cavity of a Mooney Viscometer, Moveable Die Rheometer, Rubber Process Analyzer or Encapsulated Sample Rheometer, you are in for a world of hurt and your data \u2013 like your waffle \u2013 will end up in the trash.<\/p>

That\u2019s why it\u2019s important \u2013 we would say essential \u2013 to use a barrier film that surrounds your compound during your test. And we\u2019re not just talking about putting SaranWrap\u00ae around your sample. This kind of high-temperature, high-stress application requires a barrier film that is specifically engineered for the job. But beware\u2026 Not all film is created equal!<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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Finding the Right Barrier Film for Your Testing.<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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There are two main barrier film properties that affect the test stability \u2013 material and thickness.<\/p>

The material directly affects the maximum test temperature. For example, when you test at a high temperature (200\u00b0C to 350\u00b0C), you should use polyimide films because nylon and polyester films will melt or decompose.<\/p>

Film thickness is generally selected according to maximum strain. However, many discount films are notoriously lax in their adherence to thickness standards. It\u2019s as if they think\u2026 \u201c a mil here, a mil there\u2026 what\u2019s the diff?\u201d Or, price-minded purchasing managers (you know who you are) buy films from multiple sources to save a few bucks. It\u2019s a fact that films with non-standard thickness, or films from different sources can cause changes in the die gap, a very important parameter that will directly affect the test data. Bad Film = Bad Data.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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A Deeper Dive \u2013 Comparative Results for Different Barrier Films<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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Our evaluation was done by running a classic three-stage test on a Premier RPA. The test began with a strain sweep up to 400%. Then a cure test was performed for 12 min. After that the specimen was cooled down to 60 \u00b0C by a Delay subtest in 6 minutes. Finally, two duplicate Strain subtests were carried out on the vulcanized rubber compounds. Standard EPDM compounds were selected for this experiment.<\/p>

Table 1 shows the 5 different films which are selected, F0201-S, F5058 and F0224 which are Alpha Technologies\u2019 films<\/a>, and Film 1 and Film 2, which come from other suppliers for comparison. All films were tested five times on Premier RPA-X with S2K Auto Die, feeding samples manually. The repeatability and tearing resistance of different films were then compared.<\/p>

Table 1 The specifications of 5 selected barrier films<\/em><\/p>

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Table 2 and Table 3 show the variance coefficient comparison of before-cure and post-cure properties for the five test films as well as None \u2013 no film used. From the comparison of before-cure properties, all the films show good performance, which also shows that the equipment has excellent stability. However, the variance coefficients with the F0224 and Film 1 are better, while the properties of F5058\/F0224 are relatively poor at high strains under the same condition. When the post cure properties were compared, the variance coefficients of F5058, F0224 and None are poor, and this may be related to the slippage caused by film tearing or contamination of the dies. F5058 represents the best performance<\/p>

Table 2. Variance coefficient comparison of the before cure property (Storage Modulus\/G\u2019)<\/em>
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Table 3. Variance coefficient comparison of the post cure property (Storage Modulus\/G\u2019)<\/em>
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Table 4 represents the tearing resistance performance (lower film) of the five different barrier films at different strains. The result shows F0201-S performs best in tearing resistance, as it is specially used when testing strains are over 100%. However, partial tear still occurs at 100%, with the strains increasing up to 200%, and then complete tear happened. F5058 performs better than F0224, no tear was observed at 60% strains. The performance of other films is similar, partial tear happened at 60% and complete tear happened at 100%. Compared with the lower film, the upper film has no obvious tear even under large stain because there is no relative movement between the upper film and the upper die. Figure 1 shows different failure types of films discussed above.<\/p>

Table 4 Tearing resistance performance (lower film) of different barrier film<\/em><\/p>

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Figure 1 Failure types of barrier<\/em> film<\/p>

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That\u2019s why you need to select the right film for your test. As validated in our comparative experiment, utilizing our Premier RPA, our F5058 (Polyester) is more suitable for testing post-cure or in-cure property, and F0224 (Nylon) is more suitable for testing before cure property. Using unqualified films will cause more data variations or wrong results, and even cause premature wear of parts.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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What\u2019s In It for Me \u2013 Longer Instrument Life. Better Data.<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t
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The use of a barrier film greatly facilitates the removal of samples at the end of the test and eliminates the need to clean up the residual goop in the die grooves after every test. So, you save time. What\u2019s more, the film protects the instrument\u2019s dies and seals and significantly reduce the cost of instrument maintenance and operation \u2013 so you save money, too.<\/p>

But most important of all (because, after all, the point of doing the test is getting good data) is that the right barrier film will reduce variability in your test results and ensure the stability of test data. On the other hand, discount and poor-quality film will result in the film tearing, melting and slippage, which causes bad data.<\/p>

Alpha Technologies has over 25 different films specifically engineered for different testing conditions. They are also designed for the robust testing environments of our own instruments. Of course, they are more than capable when used in other brands of rheology testing instruments.<\/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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t

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Related Links<\/h3>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t
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\n\t\t\t\t\t\n\t\t\t\t\t\t\n\t\t\t\t\t\t\t\t\tMore Thought Leadership<\/span>\n\t\t\t\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t\t\t<\/div>\n\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<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Author Simon Wan<\/span> Using the right film results in consistent, useable data and extends the life of your rubber process analyzer (RPA). During [\u2026]<\/p>\n","protected":false},"author":4,"featured_media":14037,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[19],"tags":[163],"post_folder":[],"class_list":["post-12792","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-make-my-lab-more-efficient"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.alphatechnologies.cn\/en\/wp-json\/wp\/v2\/posts\/12792","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.alphatechnologies.cn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.alphatechnologies.cn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.alphatechnologies.cn\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.alphatechnologies.cn\/en\/wp-json\/wp\/v2\/comments?post=12792"}],"version-history":[{"count":10,"href":"https:\/\/www.alphatechnologies.cn\/en\/wp-json\/wp\/v2\/posts\/12792\/revisions"}],"predecessor-version":[{"id":15860,"href":"https:\/\/www.alphatechnologies.cn\/en\/wp-json\/wp\/v2\/posts\/12792\/revisions\/15860"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.alphatechnologies.cn\/en\/wp-json\/wp\/v2\/media\/14037"}],"wp:attachment":[{"href":"https:\/\/www.alphatechnologies.cn\/en\/wp-json\/wp\/v2\/media?parent=12792"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.alphatechnologies.cn\/en\/wp-json\/wp\/v2\/categories?post=12792"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.alphatechnologies.cn\/en\/wp-json\/wp\/v2\/tags?post=12792"},{"taxonomy":"post_folder","embeddable":true,"href":"https:\/\/www.alphatechnologies.cn\/en\/wp-json\/wp\/v2\/post_folder?post=12792"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}