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Adhesion Testing

Adhesion is the ability for a coating such as paints and varnishes to adhere to a substrate termed as ‘substrate adhesion’ or the ability for a coating to adhere to multiple coats in the system which is termed ‘inter-coat adhesion’. For coatings to perform satisfactorily, they must adhere to the substrate on which they are applied including metal, concrete, wood, and more.

Why is it necessary to test adhesion 

The goal of adhesion testing is to produce a coating failure. Coating adhesion is an indicator of how well the surface was prepared and how well the coating has bonded to the surface and/or additional coating layers. Testing adhesion offers a quantifiable method of determining if a paint or coating system is fit-for-purpose and ready to meet the quality demands of job specifications.
 

PosiTest AT-A

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Automatic Pull-off Adhesion Tester

  • Electronically controlled hydraulic pump automatically applies smooth and continuous pull-off pressure. Greatly reduces user effort and the risk of influencing the pulling process.

  • Impact and scratch resistant color touch screen with keypad for operation with or without gloves

  • User adjustable pull rate, pull limit, and hold time

  • Built-in rechargeable Li-ion battery performs over 250 tests per charge

  • Internal memory stores maximum pull-off pressure, rate of pull, test duration, pressure vs. time data, dolly size, pass/fail, the nature of fracture, and notes for 100,000 pulls in up to 1,000 batches

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PosiTest AT-M

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Manual Pull-off Adhesion Tester

  • Manual hydraulic pump designed to apply smooth and continuous pressure with a single stroke

  • High-contrast, easy to read color display

  • Pull Rate Indicator to manually monitor and adjust the rate of pull

  • Internal memory stores maximum pull-off pressure, rate of pull, test duration, and dolly size for up to 200 pulls

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PosiTest CH

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Cross Hatch Adhesion Tester

  • Determines a coating's ability to resist separation from a substrate when a lattice pattern is cut into the coating in accordance with ISO 2409 and ASTM D3359

  • Includes all tools and accessories required for cross hatch testing

  • Ergonomic tool handle with non-slip grip provides comfortable all-day use

  • Pivoting cutting head ensures proper positioning and equal pressure across the cutting surface

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