Dolly Pull Off Test

Our Activities DFD® INSTRUMENTS develop, design and manufacture the PAT™ adhesion testers, which are high precision pull-off type measuring instruments for adhesion and bond strength testing of all types of films, coatings, laminates, adhesives, metals and other materials. The adhesion testing technology, based on the concept Dynamic Force Distribution™, …

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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. The Self-Aligning Dolly enables uniform distribution of the pulling force over the surface being tested, preventing a one-sided pull-off.

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4.1 The pull-off strength of a coating is a performance property that may be referenced in specifications. This test method serves as a means for uniformly preparing and testing coated surfaces, and evaluating and reporting the results. This test method is applicable to any portable apparatus meeting the requirements for determining the pull-off strength of a coating in this …

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Pull-off adhesion testing per ASTM D-4541 is a commonly used quality control check for coatings on large diameter steel water pipe. During the testing a metal dolly is glued to a pipeline coating then pulled off, to assess adhesion of the coating. In practice, results are very sensitive to circumstances and have large standard deviations

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Jan 14, 2019· Reset or rewind the gauge or actuator head to its start position and attach the dolly. To begin the adhesion test using a pull-off adhesion tester, apply a uniform increase in force in accordance ...

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Jan 14, 2019· To achieve the highest possible pull values from a pull-off adhesion test, it’s important to properly prepare both the dolly and the surface before testing. In order to minimise the risk of an ...

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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

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Adhesion Pull Off Testing Equipment. Safe Environments adhesion testing uses a Proceq Dyna Z6 Pull-off Tester with a Digital Manometer force gauge. The dolly used for the pull off testing is dependent on the type of adhesion pull off test. Generally a 50 mm aluminum doll is used to determine the adhesive strength of coatings and general adhesives.

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Several aspects of the test method were assessed, including the mix of the epoxy glue, different types of glue, surface preparation, the design of the dolly, temperature of the cure and the test, and cutting the coating or not. The difference between manual and automatic pull-off …

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Also known as Pull-Off Adhesion Tester, Hydraulic Adhesion Tester and HATE Adhesion Tester. Photo Gallery. Features . The adhesion is measured by the tensile pull on a Dolly glued to the coating surface. The force is applied through the centre of the Dolly by a hydraulically loaded pin. This ensures an exactly central point-loading of the force.

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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?

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ISO 4624:2016 specifies three methods (i.e. one dolly or two dollies on a painted panel and two dollies, one as painted substrate) for determining the adhesion by carrying out a pull-off test on a single coating or a multi-coat system of paint, varnish or related product. These test …

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Proceq DY-2 family of automated pull-off testers for concrete strength testing covers a complete range of applications with the ability to store a complete record of the test.

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Internal memory stores maximum pull-off pressure, rate of pull, test duration, dolly size, pass/fail, the nature of fracture and user notes for 100,000 pulls in up to 1,000 batches. 10, 14, 20 or 50mm dollies maximise capability and measurement resolution across a …

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POSITEST AT-A AUTOMATIC ADHESION TESTER from DeFelsko measures coatings adhesion on metal, wood, concrete, and other rigid substrates. Four models to choose from: 20 mm dollies 50 mm dollies 50 x 50 mm Tile Kit 50 mm C1583 Kit The PosiTest AT-A Automatic Adhesion Tester conforms to national and international standards for pull-off adhesion …

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Pull-off adhesion testing is carried out by adhering or gluing a test dolly to a metal's surface that has been coated to protect against corrosion. An external force is then applied to the dolly by pulling it in a perpendicular direction away from the metal's surface.

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New! Pull Rate Indicator – allows operator to easily monitor and adjust the rate of pull in accordance with international test methods. New! Easily select dolly sizes, change measurement units or store readings, with the touch of a button; New! Conversion charts not required – tester automatically calculates pressure based on dolly size

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This articles focuses on the dolly preparation process and its importance in maximizing repeatability by ensuring a strong bond at the dolly-adhesive interface. Pull Off Tester Theory of Operation Portable pull-off adhesion testers measure the force required to pull a specified diameter of coating away from its substrate.

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For further details on the theory and requirements of pull-off testing please refer to the two most applicable international standards, ISO 4624 “Paints and Varnishes – Pull off-test for adhesion” and ASTM D 4541 “Standard Test Method for Pull-Off Strength of …

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Pull-off Tests Another method for evaluating adhesion is the pull-off test. With this method, a loading fixture commonly called a dolly or stud is glued to the surface. A special device (Fig. 3) is then used to apply an increasing force until the coating dis-bonds or the glue fails. The pull is per-pendicular to the surface, so tensile

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Once the pull-off adhesion test has been completed the tensile pull-off force, whether the coating was coat or not, the dolly size and gauge type, and the failure mode of the coating are all recorded; with the nature of the failure usually recorded as an estimated percentage to the nearest 10%.

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D4541 Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers. E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods. E178 Practice for Dealing With Outlying Observations. E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method

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PosiTest® Digital Pull Off Adhesion Tester measures the force required to pull a specified test diameter coating away from its substrate using hydraulic pressure. The pressure is displayed in psi or MPa on a precision digital indicator.

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The TQC Dolly Drill eases their work considerably, and increases the accuracy of the pull off adhesion tests because of a perfect vertical cutting movement down to the metal. For the best reproducible results use the Adhesion tester AT, with the hydraulics and auto positioning feature of the pull-off head.

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Technical Bulletin MANUFACTURER Raven Lining Systems . 13105 E. 61. st Street, Suite A ... loads to the test dolly or fracturing the substrate, all of which affect test results. ... acceptable adhesion test results. View of pull-off adhesion dolly and testing device www.ravenlining.com

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The tensile pull-off method for adhesion testing, as outlined in ASTM D 4541 and similarly in BS EN ISO 4624, involves gluing a test dolly to the coated surface and then pulling the dolly by exerting a force perpendicular to the surface in an effort to remove the dolly with the coating from the substrate.

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(50mm or 20mm dollies) must be done before dolly is adhered to the surface – cutting with hole-saw (20mm dollies only) should be done after dolly is adhered and adhesive is cured. 4. Pull-off Test o After connecting actuator’s quick-coupling to the dolly, pressure is pumped into the system and the dolly pulls the coating(s) away. 5.

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5. Analysis of Test Results The dolly and the coating are examined and evaluated to determine the nature of the coating failure. (see pg. 10) 6. Store Pull-Off Test Results - Optional step The PosiTest’s internal memory stores maximum pull pressure, pull rate, test duration and dolly size for up to 200 pulls. (see pg. 10) Page 3

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the pull rate and alternate between the test number and maximum pull pressure for that test. 7KHµ6DYH¶LFRQDSSHDU s to indicate that there are test results in the memory. 30. Press WKHµ0HPRU\¶EXWWRQUHSHDWHGO\WRYLHZSUHYLRXVO\VWRUHGWHVWUHVXOWV 7KH3RVL7HVW also displays dolly size an d pull rate by pressing their respective buttons. 31.

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Internal Memory stores maximum pull-off pressure, rate of pull, test duration and dolly size for up to 200 pulls Optional PosiSoft® software available for downloading 10, 14, 20 or 50 mm dollies maximize capability and measurement resolution across a wide range of bond strengths LCD displays pressure value in psi or MPa

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