6. How to Complete a Pull-Off Adhesion Test

New and updated edition.

When testing coating adhesion using a pull off adhesion tester; once a properly prepared dolly has been glued to the prepared coating, and the glue has fully cured, you are ready to perform the pull off test.

Reset or rewind the gauge or actuator head to its start position and attach the dolly.

To begin the adhesion test using a pull-off adhesion tester, apply a uniform increase in force in accordance with your test method or standard - typically a rate of pull of 1MPa/s or 150psi/s is used for a 20mm dolly.

Whilst the rate of pull is controlled manually for most pull off adhesion testers, the Elcometer 510 automatic pull off adhesion gauge allows the rate of pull to be selected, and when the start button is pressed, the gauge applies the pre-selected rate of pull automatically.

Typically pull off adhesion tests require the dolly to be completely pulled off, or pop off the surface. Some pull off adhesion testers such as the automatic Elcometer 510 allow the user to set a maximum pull value, at which point the gauge automatically returns the pull force to zero, and records the result as “greater than the maximum pull value” – a so-called “non-destructive pull”.

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...

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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