ADHESION

Adhesion is the tendency of dissimilar particles and/or surfaces to cling to one another. The adhesive strength of paint and coatings are of crucial importance to enable the material to meet the basic functions of protection and decoration....
Adhesion is the tendency of dissimilar particles and/or surfaces to cling to one another. The adhesive strength of paint and coatings are of crucial importance to enable the material to meet the basic functions of protection and decoration.

Adhesion testing in the paint and coating industries is necessary to ensure the paint or coating will adhere properly to the substrates to which they are applied. Adhesion testing after the coating process will quantify the strength of the bond between substrate and coating, or between different coating layers or the cohesive strength of materials.

The adhesive strength of applied coatings depends heavily on the quality of the pre-treatment process prior to the coating application. Also compatibility between coatings or coating and substrate is a key factor.

Adhesion testing is used as part of inspection and maintenance procedures to help detecting potential coating failures, control the quality of a coating job or to define if an existing coating system has to be removed before applying new paint.

There are three different tests to measure the resistance of paints and coatings from substrates: cross-cut test, scrape adhesion, and pull-off test.

Cross-Cut or Cross Hatch Test
A right angle lattice pattern is used to measure the resistance of paints and coatings to separation from substrates. The pattern is cut into the coating and penetrates through the substrate. A specified pressure sensitive tape is applied to the sample and pulled off. This testing method is often used as a fast pass or fail test. If this test is used on a multi-coated sample, assessment of the resistance to separation of individual layers of the coating from each other can be made.

Scrape Adhesion
The scrape adhesion test measures the determination of the adhesion of organic coatings when applied to smooth, flat panel surfaces. It is helpful in giving relative ratings for a number of coated panels showing significant differences in adhesion. The materials being tested are applied at uniform thickness to flat panels, mainly some sort of sheet metal. When the materials have dried the adhesion is determined by pressing panels under a rounded stylus that is loaded with increasing amounts of weight until the coating is removed from the substrate surface.

Pull-Off Test
The adhesion of a coating or several coated samples of any paint product is measured by assessing the minimum tensile stress needed to detach or rupture the coating perpendicular to the substrate. Unlike the other methods, this method maximizes the tensile stress, therefore results may not be comparable to the others. The test is done by adhering a dolly perpendicular to the surface of a coating with an adhesive. Then the testing apparatus is attached to the loading fixture and is aligned to apply tension perpendicular to the test surface. The force that is applied gradually increases and is monitored until a plug of coating is detached, or a previously specified value is reached.
Standards News FAQ Links
Search on application | ADHESION | Alle productgroepen

ADHESION TEST KIT (HPK)

The TQC Adhesion Test Kit (HPK) is a method developped in the Netherlands by FOSAG and SKH to determine the adhesion of new and old paint layers on wood and woodlike materials. The damage on the substrate will be reduced to a minimu...

ADHESION TEST PAT HANDY

The TQC Adhesion Test Pat Handy is an easy to use, lightweight hydraulic adhesion tester that applies an increasing level of pull off force to a dolly adhered to the surface under test simply by turning the handle. The adhesion test...

ADHESION TESTER POSITEST AT

The new PosiTest Adhesion Tester measures adhesion of coatings applied on metal, wood, concrete and similar substrates. There is a manual and an automatic model available. Conforms to international standards including ASTM D4541/D7...

BASIC INSPECTION KIT

To fulfill the demand of many companies in the line of paint and their customers we composed the “Basic Inspection Kit”. In the field the need had arisen of one standard measuring set to perform all measurements and test...

CROSS CUT ADHESION TEST BASIC CUTTER

The TQC Cross Cut Adhesion Test Basic Cutter is used to test the adhesion of dry coats of paint on their substrate by means of a series of cuts through the coating. Two series of parallel cuts cross angled to each other to obtain a ...

CROSS CUT ADHESION TEST CC1000

The TQC Cross Cut Adhesion Test KIT CC1000 is used to test the adhesion of dry coats of paint on their substrate by means of a series of cuts through the coating. Two series of parallel cuts cross angled to each other to obtain a pa...

CROSS CUT ADHESION TEST KIT (MASTER PAINT PLATE)

The TQC Cross Cut Adhesion Test KIT (Master Paint Plate) is a stainless steel measuring tool that features: a 1 mm, 1.5 mm, 2 mm and 3 mm cross cut adhesion test according NEN-EN-ISO 2409:2003 and ASTM D 3359 (X-cut) Andreas cross. ...

CROSS CUT ADHESION TEST KIT CC2000

The TQC CC2000 Cross Cut Adhesion Test KIT is used to test the adhesion of dry coats of paint on their substrate by means of a series of cuts through the coating. Two series of parallel cuts cross angled to each other to obtain a pa...

CROSS CUT ADHESION TEST KIT CC3000

The TQC Cross Cut Adhesion Test KIT CC3000 is used to test the adhesion of dry coats of paint on their substrate by means of a series of cuts through the coating. Two series of parallel cuts cross angled to each other to obtain a pa...

CROSS CUT ADHESION TEST KNIVES

TQC delivers a wide range of Cross Cut Adhesion knife sizes, available for different coating thicknesses and substrates and according to different standards. Hardness: HRC 58 +/- 2

DIGITAL USB MICROSCOPE WITH LCD SCREEN

Small, portable, inexpensive and easy microscope with LCD display that can be connected directly to a PC. Supplied with software for immediate inspection and measuring. The unique optical design combines the advantages of a USB-micr...

DOLLY DRILL FOR ADHESION TEST

The TQC Dolly Drill is the perfect tool to remove the excess of glue and cut through the coating around dollies in order to prepare the dolly for the adhesion test. Fixed positioning is assured with the three strong magnets, allowin...

PULL OFF ADHESION TESTER MODEL PAT GM01 GM04

This Precision Pull Off Adhesion Tester is a hydraulic tensile tester that works on the so-called pull off principle, and complies with the requirements of ISO 4624. The system consists of a hydraulic hand-pump equipped with a preci...

TAPE FOR ADHESION TEST (ISO 2409 1999)

The TQC Tape For Adhesion Test (ISO 2409:1999) is used to perform a cross cut hatch adhesion test according to ISO 2409:2003 standard. To be used with Cross Cut Adhesion Test Kit CC1000, Cross Cut Adhesion Test Kit CC2000, Cross Cu...

TAPE FOR ADHESION TEST (ISO 2409 2003)

The TQC Tape For Adhesion Test (ISO 2409:2003) is used to perform a cross cut hatch adhesion test according to ISO 2409:2003 standard. To be used with Cross Cut Adhesion Test Kit CC1000, Cross Cut Adhesion Test Kit CC2000, Cross C...

TAPES FOR ADHESION-, DUST-, ROUGHNESS- and TEMPERATURE TESTS

These different TQC tapes are suitable for carrying out various tests such as the adhesion-cross cut test, the dust test, the surface roughness test with the so-called Testex films, coarse or X-coarse and tapes for curvex temperatur...

USB measuring microscope - Model 2012

Small, portable, inexpensive and easy microscope that can be connected directly to a PC. Supplied with software for immediate inspection and measuring. The unique optical design combines the advantages of a USB-microscope digital ...