![]() |
![]() |
PosiTest AT-M Manual
|
PosiTest AT-A Automatic
|
Measure adhesion of coatings to metal, wood concrete and other rigid substrates
Conforms to international standards including ASTM D4541/D7234, ISO 4624/16276-1, AS/NZS 1580.408.5 and others. Available in Automatic or Manual models.
All Models Feature
Automatic Models | Manual models | |||
![]() |
![]() |
|||
Model Order Code | ATA20 | ATA50 | ATM20 | ATM50 |
Dolly size and stand off * | 20 mm | 50 mm | 20 mm | 50 mm |
Typical Applications | Coating on metal |
Coatings on concrete, wood and plastic |
Coating on metal |
Coatings on concrete, wood and plastic |
Range |
0.7 - 24 MPa 100 - 3500 psi 100 - 7550 N |
0.4 - 3.8 MPa 50 - 560 psi 100 - 7550 N |
0.7 - 20 MPa 100 - 3000 psi |
0.4 - 3.5 MPa 50 - 500 psi |
Resolution | 0.01 MPa (1 psi) | |||
Accuracy | + / - 1 percent Full Scale | |||
* Optional 20 and 50 mm Accessory Kits allow each model to be used with alternative dolly sizes. Custom 10 and 14 mm dollies are available for special applications (compatible with 20 mm stand off) |
![]() |
All kits include everything needed for testing:
ATA20 and ATM20 Plus...
|
Measures the force required to pull a specified test diameter of coating away from its substrate using hydraulic pressure.
Overview
|
![]() |
||||||||||||
![]() |
|||||||||||||
Memory and Reporting Features
Positector App Features
|
|||||||||||||
Use the touch screen to interact with menu options. Swipe horizontally to navigate between views or vertically to move between batch readings. Alternatively, the keypad can be used for navigation and selection.
|
|||||||||||||
Recording the Nature of the Fracture Upon completion of a pull-off test, the dolly and coated surface should be examined. In addition to pull-off force, many National and International standards such as ASTM D4541 and ISO 4624 require the nature of the fracture to be recorded. |
|||||||||||||
The cohesive and adhesive fracture visual analysis can be recorded using the PosiTest AT-A's keypad or touch screen display. Alternatively, the information can be reported using the PosiTector App. Fractures are visually estimated and recorded as a percent of each. The two layer example below illustrates a cohesive fracture within coating layer 1 and layer 2 (visually estimated at 50% each). Recorded results are included in reports. |
![]() |
||||||||||||
![]() |
|||||||||||||
The PosiTest AT-A can record fracture information for up to five layers. For full details and examples see Visual Analysis and Recording of Test Results. |
Model Selection
Order Code | ATA20 | ATA50 |
Dolly size and stand off* | 20 mm | 50 mm |
Typical Applications | Coatings on metal |
Coatings on concrete, wood and plastic |
Range |
0.7 - 24 MPa 100 - 3500 psi 100 - 7550 N |
0.4 - 3.8 MPa 50 - 560 psi 100 - 7550 N |
Resolution | 0.01 MPa (1 psi) | |
Accuracy | + / - 1 percent Full Scale | |
Kits Include |
ATA20: 20 mm dollies (20), 20 mm cutting tool and 20 mm stand off Automatic Adhesion Tester, built-in rechargeable NiMH battery with charger, abrasive pad, glue with mixing sticks and palettes, cotton swabs, USB cable, PosiSoft Software, instruction booklet and video, Certificate of Calibration traceable to NIST, two-year warranty, and a sturdy, lightweight carrying case |
|
*Optional 20 and 50 mm Accessory Kits allow each model to be used with alternative dolly sizes. Custom 10 and 14 mm dollies are available for special applications (compatible with 20 mm stand off). |
Measures the force required to pull a specified test diameter of coating away from its substrate using hydraulic pressure. |
|||||||||||||||||||||||||
Key Features...
|
![]() |
||||||||||||||||||||||||
Model Selection
|
|||||||||||||||||||||||||
|
Are the PosiTest AT instruments rugged?
Absolutely. With an environmentally sealed, metal enclosure, heavy-duty hydraulic pump and a high grade industrial pressure sensor, both the Manual and Automatic PosiTest AT are built to last. They
can be used indoors, outdoors and in all types of weather.
How are the Manual and Automatic PosiTest Adhesion Testers calibrated at DeFelsko?
The Manual and Automatic PosiTest Adhesion Testers are calibrated against known conditions using NIST traceable equipment. A Certificate of Calibration containing actual measurements is included
with every tester.
How much time should be allowed for the included Resinlab EP11HT Gray to cure?
Full cure can be obtained after 24-48 hours at room temperature. Cure time can be accelerated by the application of heat. See Technical Data Sheet for full details.
Are curved dollies available for convex surfaces?
We do not provide or support the use of curved dollies for adhesion testing.
In addition to affecting the surface area used in calculating pull-off strengths and the direction of the force lines (creating unwanted shear forces), most adhesion testing standards specifically call for the use of flat dollies.
Feedback from our customers is that most internal or external pipe
applications greater than 200 mm in diameter do not require curved dollies for satisfactory results. In such cases the maximum glue gap between the surface of the dolly and the coating is 0.5 mm.
For smaller pipe diameters, depending on the expected pull-off strength of the coating, it may be possible to use a 10 mm or 14 mm dolly. The smaller surface areas of the dollies will allow them to sit flatter on the curved surface. The height of the actuator pulling the dolly becomes the limiting factor within internal diameters. External diameters can be decreased to as low as 50 mm and 100 mm respectively.
If you have more specific information on the application it may be possible to provide a more definitive response.
Can pull-off adhesion tests be conducted underwater?
The PosiTest can be used for underwater measurement provided only the cable and actuator are placed under the surface. In such cases, the following precautions should be
taken:
Note: During measurement, the manual PosiTest AT may require more than one continuous stroke to complete the test. This differs from our recommendation in the instruction manual and operational video.
PosiTest adhesion testers can be specifically manufactured with longer pressure hoses to facilitate underwater measurement.
Where does failure occur?
Tensile adhesion pulls are evaluated in pounds per square inch (psi) or megapascals (MPa), and visually, as follows:
PosiTest AT-A models can record fracture information for up to five layers.
PosiTest AT - Adhesion Tester | |
---|---|
ATM20A | PosiTest AT Manual Pull-Off Adhesion Tester 0 - 3000 PSI / 0 - 20 MPa / 20MM DOLLY |
ATM50A | PosiTest AT Manual Pull-Off Adhesion Tester 0 - 3000 PSI / 0 - 20 MPa / 50 MM DOLLY |
ATA20A-B | PosiTest AT Automatic Pull-Off Adhesion Tester 0 - 3000 PSI / 0 - 20 MPa / 20MM DOLLY |
ATA50A-B | PosiTest AT Automatic Pull-Off Adhesion Tester 0 - 3000 PSI / 0 - 20 MPa / 50MM DOLLY |
AT50KIT | PosiTest AT Includes 50 mm stand-off, holesaw and test dollies (12) 0 - 500 psi / 0 - 3.5 MPa |
DOLLY10 | PosiTest AT Additional 10 mm dollies (10) |
DOLLY14 | PosiTest AT Additional 14 mm dollies (10) |
DOLLY20 | PosiTest AT Additional 20 mm dollies (10) |
DOLLY50 | PosiTest AT Additional 50 mm dollies (4) |
DOLLY10APK100 | Multipacks PosiTest AT Additional 10 mm dollies (100) |
DOLLY14APK100 | Multipacks PosiTest AT Additional 14 mm dollies (100) |
DOLLY20APK100 | Multipacks PosiTest AT Additional 20 mm dollies (100) |
DOLLY50APK50 | Multipacks PosiTest AT Additional 20 mm dollies (50) |
ATADHESIVEKIT | PosiTest AT Adhesive Kit (additional adhesive, mixing sticks, palettes, cotton swabs) |
TMPLTAS | PosiTest AT Drilling Template for 50 mm Dollies |
ATVERIFY | PosiTest AT Verifier |
![]() |
50 mm Accessory Kit (Order Code: AT50KIT)
|
|||||||||||||||
![]() |
20 mm Accessory Kit (Order Code: AT20KIT)
|
|||||||||||||||
![]() |
Dollies (loading fixtures, stubs)
|
|||||||||||||||
![]() |
New! Multipacks - Larger quantity at a reduced cost
|
|||||||||||||||
![]() |
Drilling Template for 50 mm Dollies (Order Code: TMPLTAS)
|
|||||||||||||||
![]() |
Glue Kit (Order Code: ATADHESIVEKIT)
|
|||||||||||||||
![]() |
PosiTest AT Verifier (Order Code: ATVERIFY)
Ideal for checking the accuracy and operation of PosiTest Adhesion Testers and is an important component in fulfilling both ISO and in-house quality control requirements. The PosiTest AT Verifier and included documents allow the user to certify the accuracy of PosiTest Adhesion Testers. |