DeFelsko PosiTest AT Adhesion Testers

DeFelsko PosiTest AT Pull-off Adhesion Testers

Measure adhesion of coatings to metal, wood, concrete and other rigid substrates.

Select from four Stand-offs - 20 mm, 50 mm, 50x50 mm Tile and 50 mm C1583
Environmentally sealed enclosure – weatherproof, dustproof and shockproof - meets or exceeds IP65
Inexpensive, single-use dollies eliminate cleaning for re-use and can be kept as a permanent record
Self-aligning aluminum dolly enables accurate measurements on smooth or uneven surfaces
10, 14, 20 or 50 mm dollies maximize capability and measurement resolution across a wide range of bond strengths
Calibrated and certified to ± 1% accuracy using a NIST traceable load cell
Certificate of Calibration showing traceability to NIST included (Long Form)

Conforms to international standards including ASTM C1583/D4541/D7234/D7522, ISO 4642/16276-1, EN 1542/12004-2, AS/NZS 1580.408.5 and others

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DeFelsko PosiTest AT-M Manual Adhesion Testers: 4 Models Available
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Manual hydraulic pump designed to apply smooth and continuous pressure with a single stroke
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
Compatible with PosiSoft Desktop for viewing, printing and storing measurement data

The PosiTest AT-M Manual Adhesion Tester has been updated with a new high-contrast, easy-to-read color display, a redesigned keypad, and field replaceable AAA alkaline batteries which provide up to 16 hours of testing. For easy setup and confirmation, the updated user interface shows important pull parameters before, during, and after the test.

NEW Features

High-contrast, easy-to-read color display
Redesigned keypad and user interface
Updated aluminum, industrial-strength housing
Field replaceable AAA alkaline batteries provide up to 16 hours of testing


DeFelsko PosiTest ATM20 Pull-off Adhesion Testers	DeFelsko PosiTest ATM50 Pull-off Adhesion Testers	DeFelsko PosiTest ATM50T Pull-off Adhesion Testers	DeFelsko PosiTest ATM50C Pull-off Adhesion Testers
DOLLY SIZE & STANDOFF*	DOLLY SIZE & STANDOFF*	DOLLY SIZE & STANDOFF*	DOLLY SIZE & STANDOFF*
20 mm	50 mm	50 X 50 mm	50 mm
TYPICAL APPLICATIONS	TYPICAL APPLICATIONS	TYPICAL APPLICATIONS	TYPICAL APPLICATIONS
Higher bond strength coatings on metals	Lower bond strength coatings on wood, concrete and plastic	Cementitious adhesives for tiles	Concrete surfaces and overlays
RANGE	RANGE	RANGE	RANGE
0.7 - 20 MPa 100 - 3000 psi	0.4 - 3.5 MPa 50 - 480 psi	0.4 - 2.585 MPa 50 - 375 psi	0.4 - 3.5 MPa 50 - 480 psi
RESOLUTION	RESOLUTION	RESOLUTION	RESOLUTION
0.01 MPa (1 psi)	0.01 MPa (1 psi)	0.01 MPa (1 psi)	0.01 MPa (1 psi)
ACCURACY	ACCURACY	ACCURACY	ACCURACY
±1% Full Scale	±1% Full Scale	±1% Full Scale	±1% Full Scale
INCLUDES DOLLIES	INCLUDES DOLLIES	INCLUDES DOLLIES	INCLUDES DOLLIES
Ø20 mm (qty 20) Aluminum	Ø50 mm (qty 8) Aluminum	50x50 mm Plate (qty 4) with threaded post Steel	Ø50 mm (qty 4) with ≥ 25 mm thickness Steel
CUTTING TOOL	CUTTING TOOL	CUTTING TOOL	CUTTING TOOL
20 mm hole saw	50 mm hole saw	-----	50 mm diamond grit hole saw with arbor

* Optional 20mm/50mm/50 mm C1583/50 mm Tile Conversion 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).

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DeFelsko PosiTest AT-A Automatic Adhesion Testers: 4 Models Available
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Electronically controlled hydraulic pump automatically applies smooth and continuous pull-off pressure. Greatly reduces user effort and the risk of influencing the pulling process
User adjustable pull rate, pull limit and hold time
Internal memory stores maximum pull-off pressure, rate of pull, test duration, dolly size, pass/fail, nature of fracture and user notes for 100,000 pulls in up to 1,000 batches
Impact and scratch resistant color touch screen with keypad for operation with or without gloves
Compatible with PosiSoft Desktop, PosiSoft.net and PosiTector App (Apple iOS and Android)


DeFelsko PosiTest ATA20 Pull-off Adhesion Testers	DeFelsko PosiTest ATA50 Pull-off Adhesion Testers	DeFelsko PosiTest ATA50T Pull-off Adhesion Testers	DeFelsko PosiTest ATA50C Pull-off Adhesion Testers
DOLLY SIZE & STANDOFF	DOLLY SIZE & STANDOFF	DOLLY SIZE & STANDOFF	DOLLY SIZE & STANDOFF
20 mm	50 mm	50 X 50 mm	50 mm
DOLLY SIZE & STANDOFF	DOLLY SIZE & STANDOFF	DOLLY SIZE & STANDOFF	DOLLY SIZE & STANDOFF
Coatings on Metal	Coatings on Concrete, Wood and Plastic	Tile Adhesion Strength Conforms to BS EN 12004-2	Concrete Surfaces and Overlays Conforms to ASTM C1583
RANGE	RANGE	RANGE	RANGE
0.7 - 24 MPa 100 - 3500 psi 100 - 7550 N	0.4 - 3.8 MPa 50 - 560 psi 100 - 7550 N	0.4 - 3.033 MPa 50 - 440 psi 100 - 7550 N	0.4 - 3.8 MPa 50 - 560 psi 100 - 7550 N
RESOLUTION	RESOLUTION	RESOLUTION	RESOLUTION
0.01 MPa (1 psi)	0.01 MPa (1 psi)	0.01 MPa (1 psi)	0.01 MPa (1 psi)
ACCURACY	ACCURACY	ACCURACY	ACCURACY
±1% Full Scale	±1% Full Scale	±1% Full Scale	±1% Full Scale
INCLUDES DOLLIES	INCLUDES DOLLIES	INCLUDES DOLLIES	INCLUDES DOLLIES
Ø20 mm (qty 20) Aluminum	Ø50 mm (qty 8) Aluminum	50x50 mm Plate (qty 4) with threaded post Steel	Ø50 mm (qty 4) with ≥ 25 mm thickness Steel
CUTTING TOOL	CUTTING TOOL	CUTTING TOOL	CUTTING TOOL
20 mm hole saw	50 mm hole saw	-----	50 mm diamond grit hole saw with arbor

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DeFelsko PosiTest AT Adhesion Testers Videos
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PosiSoft Suite of Software

Four FREE and unique ways to view and report your PosiTector and PosiTest data. Learn More

PosiSoft Desktop
PosiSoft.net
PosiTector App
PosiSoft USB

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Accessories for DeFelsko Inspection Instruments - Online Catalog

F.A.Q.

Do your instruments require any formal training for use? Do you offer ‘demo’ models?

No. Our instruments are designed for simple operation, feature easy-to-use menus, both full and quick instruction manuals, and helpful videos. In lieu of demonstration models, we provide unlimited technical support via telephone and/or email, and a limited 30-day money back guarantee.

Is the DeFelsko PosiTest AT calibrated at the factory?

The DeFelsko PosiTest AT arrives fully calibrated and ready to measure. A Long-Form Certificate of Calibration traceable to NIST or PTB is included, which documents actual readings taken by your instrument at our calibration laboratory on standards traceable to a national metrology institute. Beware of ‘Certificates’ or ‘Certificates of Conformance’ offered by competitors. These typically do not include actual instrument readings, and are often insufficient to meet common quality requirements.

Is the DeFelsko PosiTest AT portable, and suitable for use in the field?

Absolutely. With an environmentally-sealed, metal enclosure, heavy-duty hydraulic pump and a high grade industrial pressure sensor, both the Manual and Automatic DeFelsko PosiTest AT are built to last. Weatherproof, dustproof and shockproof, they can be used indoors, outdoors and in all types of weather (meets or exceeds IP 65). For added utility and convenience, DeFelsko PosiTest AT-A Automatic models also include a handy shoulder strap and rubberized grips.

Does the DeFelsko PosiTest AT include steel loading fixtures (dollies)?

The DeFelsko PosiTest AT is supplied with self-aligning dollies that are precision-manufactured from strong and lightweight aluminum alloy (6061-T6). As a lower-cost alternative to steel loading fixtures, factory aluminum dollies are a single-use/consumable item and ideal for keeping as a permanent visual record of testing.

Do you have a recommended adhesive for my particular application?

The ResinLab EP11HT epoxy adhesive supplied with the DeFelsko PosiTest AT is simple to use and suitable for testing a wide range of coating types. In some instances, specialized coatings will require a more specialized adhesive.

Is the DeFelsko PosiTest AT-A more accurate than the DeFelsko PosiTest AT-M?

The certified accuracy of both DeFelsko PosiTest AT models is identical. However, the fully automatic design of the DeFelsko PosiTest AT-A provides improved measurement consistency by eliminating the potential for operator influence from the test process.

What is the difference between the 20mm and the 50mm loading fixtures?

The 50 mm dolly is commonly recommended for use with concrete, wood and composite substrates, and measures coatings with expected adhesion values between 50 psi and 560 psi (50 - 500 psi for AT-M models). The 20 mm dolly is recommended for testing coatings applied to metals or with expected adhesion values greater than 500 psi.

Can I use the DeFelsko PosiTest AT-A on curved surfaces?

Yes. Feedback from our customers is that the DeFelsko PosiTest AT gages are suitable for testing most internal or external pipe applications greater than 200 mm in diameter. In such cases, the maximum glue gap between the surface of the 20 mm 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. External diameters can be decreased to as low as 50 mm and 100 mm, for the 10 mm and 14 mm dollies, respectively. Manufacturers do 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.

How many measurements can I take with the DeFelsko PosiTest AT-A on a single battery charge?

The rechargeable battery pack (user replaceable) in the DeFelsko PosiTest AT-A can perform over 200 tests on a single charge. Use the included AC adaptor to continue testing as the battery recharges.

What is the lowest adhesion strength that the DeFelsko PosiTest AT-A can measure?

When utilized with a 50mm dolly, the DeFelsko PosiTest AT is in a priming state until reaching a priming pressure of 50 psi. It is only after the priming pressure is reached that the instrument begins calculating and displaying the pull rate. While it is possible to obtain readings below this priming pressure with the AT-M model, the AT-A automatic does not allow the operator to build priming pressure very slowly and is therefore not suitable for use below the priming pressure of 50 psi. Note that all reported adhesion values (including those obtained below the priming pressure) are subject to the DeFelsko PosiTest AT gage’s full-scale accuracy of ± 1% (± 30 psi, AT-M; ± 35 psi, AT-A).

Is there a faster curing adhesive than the epoxy supplied with the DeFelsko PosiTest AT?

The versatile epoxy adhesive supplied with the DeFelsko PosiTest AT reaches full cure within 24 – 48 hours. Operators who require faster cure times should evaluate other adhesives for their compatibility with both the coating being tested and our aluminum test dolly. Cyanoacrylate (‘super glue’) type adhesives are often sufficient for lower pull-off strengths.

Can I use the DeFelsko PosiTest AT on flexible or brittle substrates?

The DeFelsko PosiTest AT is designed for use with rigid, structural substrates. A flexible substrate can adversely impact test accuracy and repeatability. Furthermore, use of the DeFelsko PosiTest AT for measuring the adhesion of coatings applied to a brittle substrate typically results in the destruction of the substrate material, making it challenging to quantify the coating-substrate bond strength.

DeFelsko Dollies for PosiTest AT Adhesion Testers

Price: $35.00 - $550.00
DeFelsko Dollies for PosiTest AT Pull-Off Adhesion Testers
For use with PosiTest AT-A or PosiTest AT-M
Ideal measuring bond strengths up to 3, 500 psi (24 mpa)
Self-aligning spherical dolly head enables consistent measurements on rough and uneven surfaces
DeFelsko PosiTest AT Verifier

Price: $3,415.00
Range: 0 - 5,000 psi
DeFelsko PosiTest AT Verifier Adhesion Tester Accuracy Verification Kit
Manufacturer: DeFelsko
Warranty: One Year
DeFelsko PosiTest CH Cross Hatch Adhesion Test

Price: $325.00
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
Conforms to ISO 2409/16276-2, ASTM D3359, AS 3894.9/1580.408.4, JIS K 5600-5-6

Displaying 13 to 15 (of 15 products)

DeFelsko PosiTest AT Adhesion Testers

DeFelsko Dollies for PosiTest AT Adhesion Testers

DeFelsko PosiTest AT Verifier

DeFelsko PosiTest CH Cross Hatch Adhesion Test