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PosiTest® AT

Pull-off Adhesion Testers

Measures adhesion of coatings to metal, wood, concrete and other rigid substrates.
  • 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
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Features

simple icon

Simple

  • Inexpensive, single-use dollies eliminate cleaning for re-use and can be kept as a permanent record
  • 10, 14, 20 or 50 mm dollies maximize capability and measurement resolution across a wide range of bond strengths
durable icon

Durable

  • Environmentally sealed enclosure – weatherproof, dustproof and shockproof - meets or exceeds IP65
accurate icon

Accurate

  • Self-aligning aluminum dolly enables accurate measurements on smooth or uneven surfaces
  • Calibrated and certified to ± 1% accuracy using a NIST traceable load cell

PosiTest AT-A Automatic

PosiTest AT Automatic
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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 DesktopPosiSoft.net and PosiTector App (Apple iOS and Android)

PosiTest AT-M Manual

PosiTest AT Manual
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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

PosiTest AT-A

Key Features...

  • 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
  • Built-in rechargeable battery performs over 200 tests per charge. Continue testing with AC power while the battery recharges.
  • Environmentally sealed enclosure – weatherproof, dustproof and shockproof - meets or exceeds IP65
  • Rubberized, shock absorbing grips provide a stable, skid-resistant footing
  • 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. Maximum pull-off pressure by dolly size...
    - 10 mm: 14000 psi (96 MPa)
    - 14 mm: 7000 psi (50 MPa)
    - 20 mm: 3500 psi (24 MPa)
    - 50 mm: 560 psi (3.8 MPa)
  • User selectable measurement units: psi (pounds per square inch), MPa (Megapascal), Nmm2 (Newtons per millimeter square) or Newton (force)
  • User adjustable pull rate, pull limit and hold time
  • Rotating display for horizontal and vertical use
  • Pressure system is calibrated and certified to ± 1% accuracy using a NIST traceable load cell
  • Conforms to international standards including ASTM D4541/D7234, ISO 4624/16276-1, AS/NZS 1580.408.5 and others
  • Software Updates via web keep your instrument current

2 Models Available

AT-A Chart with order code and product specifications

Both models include 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).

Memory and Reporting Features

  • Internal memory stores maximum pull-off pressure, rate of pull, test duration and dolly size for 100,000 pulls in up to 1,000 batches
  • Record the results as pass/fail and the nature of fracture - cohesive, adhesive and glue failures
  • Wirelessly connect to your smart device using our free PosiTector App (Apple iOS and Android)
  • WiFi technology wirelessly communicates with PosiSoft.net, downloads software updates and allows access to stored measurement data using standard web browsers (see WiFi Features for full details)
  • PosiSoft USB Drive - stored readings and graphs can be accessed via USB using universal PC/Mac web browsers or file explorers. No software required
  • Compatible with PosiSoft DesktopPosiSoft.net and PosiTector App (Apple iOS and Android) software solutions

PosiTector App Features

PosiTector App in hand
  • Add images and notes using the camera or keyboard
  • Create customized, professional PDF reports
  • Share, backup, synchronize and report measurement data
  • Auto-pairing Bluetooth (BLE) connection
  • See the Help File to learn about how it works

Touch Screen Display

AT-A touch screen
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.
screenshot of AT-A screen during use
User adjustable dolly size, pull rate, 
pull limit and hold time.
screenshot of AT-A screen during use
Batch summary provides an at-a-glance review of test results.
screenshot of AT-A screen during use
View test parameters and reading results. Reading is recorded as pass or fail based on set test parameters. The pass/fail results can be revised.
screenshot of AT-A screen during use
Notes can be added for each reading.
screenshot of AT-A screen during use
Include a note for a batch (group) of readings.
screenshot of AT-A screen during use
Record the nature of failure - cohesive, adhesive and glue failures.

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.

  • Cohesive fracture: fracture occurs within a coating layer (same coating on dolly face and coated surface).
  • Adhesive fracture: fracture occurs at the interface between layers (coating on dolly face differs from surface).
  • Glue failure: visible separation of the glue from itself, the coating or dolly (no coating visible on the dolly face).

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.

fracture types
fracture type explanations with screenshot of touch screen
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PosiTest AT-M

Key Features...

  • 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
  • Environmentally sealed enclosure – weatherproof, dustproof and shockproof - meets or exceeds IP65
  • 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
    - 10 mm: 10000 psi (70 MPa)
    - 14 mm: 6000 psi (40 MPa)
    - 20 mm: 3000 psi (20 MPa)
    - 50 mm: 500 psi (3.5 MPa)
  • Every PosiTest Adhesion Tester pressure system is calibrated and certified to ± 1% accuracy using a NIST traceable load cell
  • Internal memory stores maximum pull-off pressure, pull rate, test duration and dolly size for up to 200 pulls
  • Compatible with PosiSoft Desktop software for viewing, printing and storing measurement data
  • Conforms to international standards including ASTM D4541/D7234, ISO 4624/16276-1, AS/NZS 1580.408.5 and others
  • Software Updates via web keep your instrument current

2 Models Available

AT-M Chart with order code and product specifications

Both models include Manual 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 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).

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Accessories

50 mm Accessory Kit

Interchangeable standoff allows a PosiTest ATM20 or ATA20 to pull 50 mm dollies. Ideal for lower bond strength finishes such as coatings on wood, concrete and plastic.

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20 mm Accessory Kit

Interchangeable standoff allows a PosiTest ATM50 or ATA50 to pull 10, 14 and 20 mm dollies. Ideal for high bond strength finishes such as coatings on metal.

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Dollies

Loading fixtures, stubs for adhesion testing.

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Dolly Multipacks

Larger quantity of dollies at a reduced cost.

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Drilling Template for 50 mm Dollies

Drilling template and drill bits to isolate test area, ideal for thicker coatings on concrete.

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Glue Kit

Additional glue, mixing sticks, palettes and cotton swabs.

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PosiTest AT Verifier

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.

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Pelican Case for PosiTest AT Pull-Off Adhesion Testers

Heavy-duty, waterproof Pelican cases complete with a custom foam insert to securely hold your PosiTest instrument.

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Videos

Software

PosiSoft Software in use

PosiSoft Desktop

Powerful desktop software for downloading, viewing, printing and storing measurement data. No internet connection required.

  • Simple, intuitive user interface
  • Import readings directly from the gage via USB or from legacy PosiSoft desktop versions
  • Synchronize measurement data including readings, notes and pictures to and from PosiSoft.net
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PosiSoft.net

The intuitive and familiar user interface of PosiSoft Desktop brought to your web browser. Data is securely stored in the cloud.

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PosiTector App

An easy-to-use mobile app (iOS/ Android) that connects to your PosiTector Advanced, PosiTector Smartlink, or PosiTest AT.

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PosiSoft USB

A simple gage interface to retrieve data in a manner similar to a flash drive. No software to install or internet connection required.

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PosiSoft Custom PDF Report Generator

featured on PosiSoft Desktop, PosiSoft.net, PosiTector App
Easily create reports from your measurement data in seconds
  • Generate custom, professional PDF reports
  • Include inspection information such as on-site pictures, screen captures, notes and more to communicate important details
  • Create and save multiple custom layouts as templates – insert cover pages, add logos/images, and select font and point size
  • Select the information to include for each product type – charts, histograms, readings, time stamps and more
  • Compile multi-batch reports from one or more probes and instrument types

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 PosiTest AT calibrated at the factory?

The 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 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 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, PosiTest AT-A Automatic models also include a handy shoulder strap and rubberized grips.

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

The 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, DeFelsko 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 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 PosiTest AT-A more accurate than the PosiTest AT-M?

The certified accuracy of both PosiTest AT models is identical. However, the fully automatic design of the 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 PosiTest AT-A on curved surfaces?

Yes. Feedback from our customers is that the 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.

DeFelsko does 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 PosiTest AT-A on a single battery charge?

The rechargeable battery pack (user replaceable) in the 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 PosiTest AT-A can measure?

When utilized with a 50mm dolly, the 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 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 PosiTest AT?

The versatile epoxy adhesive supplied with the 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 PosiTest AT on flexible or brittle substrates?

The PosiTest AT is designed for use with rigid, structural substrates. A flexible substrate can adversely impact test accuracy and repeatability. Furthermore, use of the 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.

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© 2017 DeFelsko Corporation.  ALL RIGHTS RESERVED.