2 Models:
ATA20 - with stand-off, cutting tool and 20mm dollies for coatings on metals
ATA50 - with stand-off, cutting tool and 50mm dollies for coatings on wood, concrete and plastics

The DeFeslsko Positest AT-A Automatic Pull-Off Adhesion Tester measures the force required to pull a specified test area of coating away from a substrate using hydraulic pressure. An electronically controlled hydraulic pump automatically applies smooth and continuous pull-off pressure. The pump greatly reduces user effort and the risk of influencing the pulling process.

The AT-A's built-in rechargeable battery performs over 200 tests per charge. The supplied AC adapter / charger allows you to continue testing with AC power while the battery recharges.

The AT-A is features an environmentally sealed enclosure. It is weatherproof, dustproof and shockproof. Meeting or exceeding IP65 rating.

Photo Gallery

Features 

• Conforms to international standards including ASTM D4541 D7234, ISO 4624 16276-1, AS/NZS 1580.408.5 and others
• 10, 14, 20 or 50 mm dollies maximize capability and measurement resolution across a wide range of bond strengths
• User selectable measurement units: psi (pounds per square inch), MPa (Megapascal), Nmm2 (Newtons per millimeter square) or Newton (force)
• Rotating display for horizontal and vertical use
• Every PosiTest Adhesion Tester pressure system is calibrated and certified to ± 1% accuracy using a NIST traceable load cell
• Impact and scratch resistant color touch screen with keypad for operation with or without gloves
• User adjustable pull rate, pull limit and hold time
• Record the results as pass/fail and the nature of fracture - cohesive, adhesive and glue failures
• 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

ATA Self-Alignment Feature 

Unequal pulling force during testing caused by uneven adhesive bond lines and coating surfaces can result in random, unexplainable readings. To obtain more repeatable and meaningful adhesion measurements, it is imperative that the pulling force applied to the test dolly is uniformly distributed over the surface being tested.

Both the PosiTest AT-M manual and PosiTest AT-A automatic models compensate for misalignment. The self-aligning, quick-coupling actuator and spherical articulating dolly head enable uniform distribution of the pulling force over the surface being tested, preventing a one-sided pull-off.

Data Output and Memory

• Wirelessly connect to your smart device using our free app
  • 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
• 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
• WiFi wireless features...
  • communicate with PosiSoft.net
  • download software updates
  • access stored measurement data using standard web browsers
• 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 desktop software, PosiSoft.net and PosiTector  App

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.

Optional Accessories

20 mm Accessory Kit (Order Code: AT20KIT) 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 Includes 20 mm stand-off, 20 mm hole saw and 20 mm aluminum test dollies (20)

50 mm Accessory Kit (Order Code: AT50KIT) 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 Larger surface area of dolly provides improved low range precision and repeatability Includes 50 mm stand-off, 50 mm hole saw and 50 mm aluminum test dollies (12)

Dollies (loading fixtures, stubs) Size Quantity Part Number 10mm 10 DOLLY10 14mm 10 DOLLY14 20mm 10 DOLLY20 50mm 4 DOLLY50

New! Dolly Multipacks - Larger quantity at a reduced cost Size Quantity Part Number 10mm 100 DOLLY10APK100 14mm 100 DOLLY14APK100 20mm 100 DOLLY20APK100 50mm 50 DOLLY50APK100

Drilling Template for 50 mm Dollies (Order Code: TMPLTAS) Drilling template and drill bits to isolate test area, ideal for thicker coatings on concrete Includes (10) drill bits 5/32" (4 mm)

Glue Kit (Order Code: ATADHESIVEKIT) ResinLab EP11HT 2-Part Epoxy Additional glue, mixing sticks, palettes and cotton swabs

Related Products

DeFelsko PosiTest AT-M Manual Pull-Off Adhesion Tester - Positest AT-M

PosiTest AT Verifier (Order Code: ATVERIFY) Adhesion Tester Accuracy Verification Kit - 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

Complete Kit

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

ATA20: 20 mm dollies (20), 20 mm cutting tool and 20 mm stand off.
ATA50: 50 mm dollies (8), 50 mm cutting tool and 50 mm stand off.