4. Preparing the Dolly and the Coating - Pull-Off Adhesion Test

New and updated edition. To achieve the highest possible pull values from a pull-off adhesion test, it’s important to properly prepare both the dolly and the surface before testing. In order to minimise the risk of an adhesive glue failure, where the glue fails before the coating, carefully abrade the dolly and the surface using sandpaper. Once the dolly and the coating have been suitably abraded, to further avoid a glue adhesive failure, clean both surface areas using a suitable solvent to remove any dust or grease. Mix the adhesive in accordance to the adhesive manufacturer’s instructions, and apply a thin, uniform film over the entire dolly face. Press the dolly down onto the prepared test surface, applying an even pressure to the dolly to ensure that the dolly face is parallel to the test surface. Remove any excess adhesive from around the dolly and hold the dolly in place until fully cured using either a dolly magnet or tape. Adhesive cure times are dependent on the glue, as well as the ambient and surface temperatures, so please refer to the manufacturer’s instructions for guidance. All pull-off adhesion testers follow the same principle. A properly prepared dolly, or pull stub, is glued to the prepared coating, and, once the glue has fully cured, the dolly is pulled off -perpendicularly (or 90 degrees) from the surface. The resultant tensile pull-off force, together with the dolly diameter, and the conditions of the dolly, are all recorded. For more information on measuring pull-off adhesion on coated substrates using Elcometer's range of pull-off adhesion gauges, please contact Elcometer at [email protected] or visit our website: http://elcometer.com/en/coating-inspe... ----- Click here to download the video script in English: https://www.elcometer.com/pub/media/P... ----- STANDARDS: Elcometer 106 AS 1580.408.5, ASTM D 4541, AS/NZS 1580.408.5, EN 13144, EN 24624, ISO 4624, ISO 16276-1, JIS K 5600-5-7, NF T30-062, NF T30-606 Elcometer 106/6 ASTM D 7234, BS 1881-207, DIN 1048-2, EN 1542, EN 12636 Elcometer 506 ASTM D4541, ASTM D7234, AS/NZS 1580.408.5, BS 1881-207, DIN 1048-2, EN 12636, EN 13144, EN 1542, EN 24624, ISO 16276-1, ISO 4624, NF T30-606, NF T30-062 Elcometer 510 ASTM C1583, ASTM D4541, ASTM D7234-12, AS/NZS 1580.408.5, BS 1881-207, DIN 1048-2, EN 1015-12, EN 12636, EN 13144, EN 1542, EN 24624, ISO 16276-1, ISO 4624, NF T30-606, NF T30-062