Adhesion test equipment

 

Tape test results you can rely on pull after pull

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Stand Sec Content ReliaPull®  conforms by: Issues when done by hand.
ASTM D 3359
F 1842
7.2,

12.2,

9.2

Cut through coating to the substrate. No change. Use same procedure to prepare cross-hatch whenever required / desired.  
ASTM D 3359
F 1842
7.4,

12.6,

9.5

Remove two complete laps of tape and discard. Remove an additional length at a steady (that is, not jerked) rate and cut a piece about 75mm (3”) long. Each cycle of the ReliaPull ensures fresh tape, no need to discard extra tape. Mechanical removal assures smooth even separation from roll. ReliaPull provides up to 7” of test tape. Must keep track of removing two laps, risk contamination/change to adhesive, or waste tape. Removing by hand difficult to keep smooth. Tape rarely cut to length and often much greater than 3”. Tape cut by hand easily tangles and becomes contaminated by fingers or dust.
ASTM D 3359
F 1842
7.5,

12.7,

9.6

Smooth tape into place by finger in the area of the incision then rub firmly with the eraser on the end of a pencil. The color under the transparent tape is a useful indication of when good contact has been made. Specially designed brush counter rotates back across tape, smoothing out all bubbles, conforming to surface and with consistent pressure every time. No need to check for color change in tape or find an eraser. Operators use a varying range of methods for smoothing tape down, including the thumb, thumb nail, palm, back of a tool…, but seldom a pencil eraser, least one of same durometer. Additional efforts to check color / re-smooth tape affect total time of test and consistency of bond across test tape.
ASTM D 3359
F 1842
7.6,

12.8,

9.7

Within 90 +/- 30 (or+/-15) seconds of application, remove the tape by seizing the free end and pulling it off rapidly (not jerked) back upon itself at as close to an angle of 180º as possible. No change to timing, activate test as internal standards dictate. Use of timer on ReliaPull is helpful to maintain consistency. Tape remains connected at both ends, no need to pry up free end. Speed controlled by difference in initial force to start test, lower force to complete test and gear drive. Lever lowers to assure 180º pull every time, no variation in XYZ planes. The free end of the tape frequently lays flat, causing the operator to pick at the edge with a finger nail. The rate of removal is frequently adjusted to suit the desire of the operator and the angle varies widely in all X, Y and Z planes, changing torque, shear and pull forces.
ASTM D 3359
F 1842
7.7,

12.9,

9.8

Inspect the X-cut area for removal of coating from the substrate or previous coating and rate the adhesion in accordance with the scale: In addition to viewing the substrate the ReliaPull provides a viewing area for the tape itself. The tape is more often used with the scale due to its translucency in comparison to inks or paints. Tape removed by hand often needs another flat surface of a different color to get a good comparison. Either the operator must hold the used tape up by hand or re-stick it to another surface.
ASTM D 3359 7.8,

12.10

Repeat the test in two other locations on each test panel. For large structures make sufficient tests to ensure that the adhesion evaluation is representative of the whole surface. By having a longer and consistent length of test tape the ReliaPull allows the operator to align test strips across a large area to determine where specific spots or problem areas exist. Defect patterns are more easily detected this way. In some printing, painting or coating operations low spots or unprimed areas can go undetected. Using small test strips placed at random across a larger area can allow an operator to miss a problem.
ASTM D 3359 X1.6 The tape test is operator intensive… The accuracy and precision depend largely upon the skill of the operator and the operator’s ability to perform the test in a consistent manner. Key steps that directly reflect the importance of operator skill include the angle and rate of tape removal… ReliaPull provides a consistent peel or pull angle every time, regardless of operator or skill. As well, the consistency of removal speed has been vastly improved by the mechanisms internal to the ReliaPull. From operator to operator, and from time to time with one operator, experience has shown that by varying the method of applying the tape, the removal angle and speed, final results can vary widely across the scale, even within the same test panel. The results are seldom reliable and tests often need to be performed repeatedly, wasting time and resources.
ASTM D 3359 X1.6.2 …Variations in pull rate and peel angle can effect large differences in test values and must be minimized to assure reproducibility. Ditto Ditto

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