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Adhesion / adhesive strength

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3 Adhesion / adhesive strength

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Adhesion Positestch 570x570

What is adhesion

Adhesion is the ability of a coating such as paints and varnishes to adhere to a substrate, which is referred to as "substrate adhesion", or the ability of a coating to adhere to multiple layers in the system, which is referred to as "intercoat adhesion". For coatings to perform satisfactorily, they must adhere to the substrate to which they are applied, e.g. metal, concrete, wood and other materials.

Adhesion Positestch 570x570

What is a deductibility test?

In accordance with ASTM D4541/D7234, ISO 4624 and others, adhesion testers evaluate the adhesion (peel strength) of a coating by determining the greatest tensile force it can withstand before peeling. Fractures, manifested by broken surfaces, occur along the weakest plane within the system consisting of the dolly (loading device, puller), the adhesive, the coating(s) and the substrate.

The PosiTest AT series measures the force required to peel a specific test diameter of coating from its substrate using hydraulic pressure.

Adhesion Positestch 570x570

Why is it necessary to check adhesion?

The aim of the adhesion test is to create a coating defect. Coating adhesion is an indicator of how well the surface has been prepared and how well the coating is bonded to the surface and/or additional coating layers. Adhesion testing provides a quantifiable method to determine whether a paint or coating system is fit for purpose and can fulfil the quality requirements of the job specifications.

Devices

Liability Positestata 570x570

PosiTest AT-A

Automatic peel adhesion tester

  • The electronically controlled hydraulic pump automatically ensures an even and continuous trigger pressure.
  • Significantly reduces the effort required by the user and the risk of influencing the extraction process.
  • Impact and scratch-resistant colour touchscreen with keypad for operation with or without gloves
  • User-adjustable pulling speed, pulling limit and holding time
  • Built-in battery performs over 200 tests per charge
  • The internal memory stores the maximum pull-off pressure, the pull-off speed, the test duration, the dolly size, the
  • Pass/fail, the type of break and user instructions for 100,000 prints in up to 1,000 batches.
Liability Positestatm 570x570

PosiTest AT-M

Manual trigger adhesion tester

  • Manual hydraulic pump that generates even and continuous pressure with a single stroke
  • High-contrast, easy-to-read colour display
  • Traction force indicator for manual monitoring and adjustment of the traction force
  • The internal memory stores the maximum pull-off pressure, the pull-off speed, the test duration and the dolly size for up to 200 pull-offs
Adhesion Positestch 570x570

PosiTest CH

Cross Hatch Adhesion Tester

  • Determines the ability of a coating not to detach from a substrate when a grid pattern is cut into the coating, according to ISO 2409 and ASTM D3359
  • Contains all tools and accessories required for testing transverse slips
  • Ergonomic tool handle with non-slip grip for all-day comfortable use
  • The swivelling cutting head ensures correct positioning and even pressure on the cutting surface