Using a dedicated loop tack tester<\/strong>\u2014such as the LTT-01 from Instruments cellulaires<\/a>\u2014ensures accuracy, repeatability, and compliance with international standards. In this article, we explain the ASTM D6195 standard, detail the testing procedure, and explore why loop tack matters in adhesive performance evaluation.<\/p>\n Le m\u00e9thode d'essai d'adh\u00e9rence \u00e0 la boucle<\/strong>, as defined in ASTM D6195, measures the peak force required to separate a loop of adhesive tape from a standardized surface after momentary contact. There are two official methods under this standard:<\/p>\n M\u00e9thode A<\/strong>: Performed on a universal tensile tester using a 7-inch adhesive strip<\/p>\n<\/li>\n M\u00e9thode B<\/strong>: Uses a dedicated loop tack tester<\/strong> with a 5-inch strip for streamlined QC applications<\/p>\n<\/li>\n<\/ul>\n In both cases, the adhesive sample is formed into a loop and brought into contact with a stainless steel test panel<\/strong>. The maximum force required to peel<\/strong> the adhesive loop from the surface is recorded as the loop tack value<\/em>\u2014a direct indicator of the adhesive\u2019s initial bonding strength.<\/p>\n To ensure consistent and reliable loop tack results, it’s crucial to follow the standard procedure outlined in ASTM D6195:<\/p>\n 1. Sample Preparation<\/strong><\/p>\n Cut three adhesive strips, each measuring 25 mm \u00d7 125 mm<\/strong> (1″ \u00d7 5″)<\/p>\n<\/li>\n If the adhesive is unsupported (e.g., transfer tapes), laminate it onto 2 mil PET film before cutting<\/p>\n<\/li>\n Condition all samples at 23\u202f\u00b1\u202f2\u202f\u00b0C<\/strong> et 50\u202f\u00b1\u202f5% RH<\/strong> for at least 24 hours<\/p>\n<\/li>\n<\/ul>\n 2. Surface Cleaning<\/strong><\/p>\n Clean the stainless steel test panel using acetone<\/strong> ou n-heptane<\/strong><\/p>\n<\/li>\n Use lint-free wipes<\/strong> and verify cleanliness using a water-break test<\/strong><\/p>\n<\/li>\n<\/ul>\n 3. Loop Formation<\/strong><\/p>\n Gently fold each strip back on itself to form a teardrop-shaped loop<\/strong><\/p>\n<\/li>\n Use 1-inch masking tape<\/strong> to fasten the ends without contaminating the adhesive area<\/p>\n<\/li>\n<\/ul>\n 4. Test Execution<\/strong><\/p>\n Insert the taped ends into the upper clamp<\/strong> de la loop tack tester<\/strong><\/p>\n<\/li>\n Lower the loop onto a 1 in\u00b2 steel test surface at a controlled speed<\/p>\n<\/li>\n Reverse direction and record the peak force<\/strong> needed to detach the loop<\/p>\n<\/li>\n<\/ul>\n 5. Data Collection and Analysis<\/strong><\/p>\n Capture the maximum separation force<\/strong> in Newtons or pounds<\/p>\n<\/li>\n Enregistrer les failure mode<\/strong> (adhesion, cohesion, or adhesive transfer)<\/p>\n<\/li>\n Repeat for all samples to ensure statistical confidence<\/p>\n<\/li>\n<\/ul>\nLoop Tack Test Method and Loop Tack Tester in ASTM D6195<\/h2>\n
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Step-by-Step Guide to ASTM D6195 Loop Tack Testing<\/h2>\n
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