PosiTest AT Pull-Off Adhesion Tester
- Brand
- DeFelsko
- Model
- PosiTest AT
- Origin
- USA
- Industries
- Coatings, construction
Features
Measures the pull-off adhesion of coatings on metal, wood, concrete and other rigid substrates in MPa or psi.
1. Product description
The DeFelsko (USA) PosiTest AT measures the pull-off adhesion of coatings on metal, wood, concrete and other rigid substrates, in MPa or psi.
1. All models feature:
① Environmentally sealed housing – for use in all weather, dustproof and shock-resistant, meeting or exceeding IP65.
② Inexpensive disposable dollies – no cleaning for re-use, and they can be kept as a permanent record.
③ Conformity with international standards including ASTM D4541/D7234, ISO 4624/16276-1, AS/NZS 1580.408.5 and others.
④ A choice of 10, 14, 20 and 50 mm dollies to suit high or low bond strengths and improve resolution.
⑤ Every unit is calibrated and comes with a calibration certificate; accuracy is 1%, and the calibration sensor is traceable to NIST.
2. Self-aligning
① Automatically compensates for misalignment.
② Quick-coupling actuator aligns itself. 
③ Ball-joint coupling for the test.
④ Applies an even pull-off force across the surface.
⑤ Prevents one-sided pull-offs.
2. Model comparison
1. PosiTest AT-M (manual)
① Manual hydraulic pump gives smooth, continuous hydraulic pressure in a single stroke.
② Displays the pull rate, so it can be adjusted by hand.
③ Stores 200 results internally, including maximum pull-off pressure, pull rate, pull time and dolly size.
④ Compatible with PosiSoft software.
2. PosiTest AT-A (automatic)
① Electric hydraulic pump applies smooth, continuous pressure automatically, greatly reducing operator influence and the risk of affecting the test.
② Pull rate, pull limit and dwell time can be set.
③ Built-in rechargeable battery gives 200 tests per charge; tests can run on AC power while charging.
④ Stores maximum pull-off pressure, pull rate, pull time, dolly size, pass/fail, fracture condition and user notes – up to 100,000 results in up to 1,000 batches.
⑤ Compatible with PosiSoft software, PosiSoft.net and the PosiTector App.
⑥ PosiSoft USB drive – stored readings and graphs can be downloaded to a PC without special software.
⑦ WiFi connects to PosiSoft.net for software updates.
⑧ Rubber bumpers on both sides absorb shocks, prevent slipping and provide support.
⑨ Impact- and scratch-resistant colour display; keypad operation, with or without gloves.
⑩ Connects wirelessly to smart devices through a free app.
3. Ordering guide
Manual models | ATM20 0.7 – 20 MPa 100 – 3000 psi | ATM50 0.4 – 3.5 MPa 50 – 500 psi |
Automatic models | ATA20 0.7 – 24 MPa 100 – 3500 psi 100 – 7550 N | ATA50 0.4 – 3.8 MPa 50 – 560 psi 100 – 7550 N |
Dolly size | 20 mm | 50 mm |
Typical applications | Coatings on metal | Coatings on wood, concrete and plastics |
Resolution | 0.01 MPa (1 psi) | |
Accuracy | ± 1% of full scale | |
4. Standard equipment
AT-A gauge (built-in rechargeable NiMH battery); AT-M with 3 AAA alkaline batteries
Charger, dollies, abrasive pads,
cutting tool, adhesive,
mixing card, cotton swabs
USB cable
Shoulder strap (AT-A)
Certificate traceable to NIST
Carrying case
5. Optional accessories
Dolly size | Measuring range |
10 mm dolly | 400 – 10,000 psi 2.8 – 70 MPa |
14 mm dolly | 200 – 6000 psi 1.4 – 40 MPa |
20 mm dolly | 100 – 3000 psi 0.7 – 20 MPa |
50 mm dolly | 50 – 500 psi 0.4 – 3.5 MPa |
Note: 50 mm dollies need the optional 50 mm kit.
Manual models | ATM20 0.7 – 20 MPa 100 – 3000 psi | ATM50 0.4 – 3.5 MPa 50 – 500 psi |
Automatic models | ATA20 0.7 – 24 MPa 100 – 3500 psi 100 – 7550 N | ATA50 0.4 – 3.8 MPa 50 – 560 psi 100 – 7550 N |
Dolly size | 20 mm | 50 mm |
Typical applications | Coatings on metal | Coatings on wood, concrete and plastics |
Resolution | 0.01 MPa (1 psi) | |
Accuracy | ± 1% of full scale | |