ADHESION

Paul N. Gardner Co., Inc. • www.gardco.com • (954) 946-9454 • 1-800-762-2478

MODEL P-A-T PAINT ADHESION TEST KITS

Multiple tip cutters are available with guide teeth and six spaced teeth at 1.0 and 2.0mm. The 1.0mm spacing is also available with eleven teeth and guide teeth. Available without guide teeth are cutters with eleven spaced teeth at 1.5mm. Also note other cutter blades illustrated in the dimensional drawings and special variable spaced cutters and cutters for curved surfaces.

Note well-made carrying case that holds Cross-Cut Tester and all accessories.

The P-A-T Paint Adhesion Test Kit produced by Gardco contains all of the tools and materi-als needed, except for the multi-tooth cutter blade, for conducting adhesion tests on paints applied to a flat, uniform surface in accordance with ASTM Test Method D 3359, method B and DIN Standard No. 53151. The multi-tooth cutter blade is furnished separately to permit choice among the various available designs.

Due to the accuracy of the spacings and the speed with which the test can be conducted, the multiple tooth cutter is the preferred tool for use in this test except when evaluations must be made on coatings applied to surfaces which are neither flat or relatively smooth. Under these adverse conditions a single razor blade type cutter is often desirable under method A of ASTM. A Multi-Tooth Adhesion Cutter for pipe is also available.

The PA-2000 kit includes the new blade holder / handle with guide, hex wrench for changing blades, flaking brush, illuminated magnifier with batteries, tape - PA-280630*, copy of ASTM Test Method D-3359 for use as an instruction guide, and a sturdy plastic carrying case with handle. All of the components are nested in laminated die-cut foam within the case.NEW 10X LED Hand held magnifier w/batteries. Magni-fier has 2 LED lights and 1.5” glass lens.

* Permacel #99 test tape no longer available.Currently supplying PA-280630 Polyester Rope Fiber Laminate.

Meets ASTM Test Method D 3359, Method B & DIN Standard and Meets ISO 2409

NEW ergonomic handle design gives comfortable and precision control, helps keep hand in natural position pre-venting strain and fatigue. One handle for both the right handed or left handed person.

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ADHESION

Paul N. Gardner Co., Inc. • www.gardco.com • (954) 946-9454 • 1-800-762-2478

1. The test specimen should be prepared as outlined in ASTM D 3359. 2. When positioning the blade in the handle, make sure the holes face the securing set screws taking care not to over tighten.3. Place the cutter assembly on the test specimen so that it rests on the guide and the rear of the handle. 4. Grasp the handle and rotate it upward with respect to the line of contact of the guide with the test surface. During this motion, the tips of the cutter first contact the test surface when the top of the handle is about seven degrees with respect to the test surface. Continue this motion until the top surface of the handle is elevated to about 15 degrees. This is the correct altitude of the cutter assembly for the test. 5. With enough pressure on the handle to insure that all of the cutter tips penetrate to the test specimen supporting base, pull the assembly along the test surface through 0.75 to 1.00 inch. Repeat this procedure with a second cut intersecting the first pattern at 90° (±5°). Evaluate results of the test as indicated in ASTM D 3359, method B.

OPERATION

The tool is also suitable for testing coats of paint that already have been exposed to weather or aged, and for scoring paint films prior to deep drawing.

CLASSIFICATION CHARTClassification

Percent of Area

Removed

Surface of Cross-cut Area From Which Flaking has Occured For Six Parrallel Cuts

and Adhesion Range by Percent

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ADHESION

Paul N. Gardner Co., Inc. • www.gardco.com • (954) 946-9454 • 1-800-762-2478

Before shipment, our blades must pass a cutter blade tooth accuracy inspection check. You can periodically check the accuracy of your cutter blade in the same manner. Use a small piece of polished plate glass. With a match or lighter, smoke a portion of the glass. This will leave an extremely

TIPS ON THE USE OF CROSS CUT BLADES

thin black film. With the blade mounted in the handle, pull it across the film. All teeth should make tracks. If all teeth do not touch when used on a coated panel it will indicate that the panel surface is not plane or one or more of the teeth have been damaged.Some customers using the cross-cut adhesion blades have had problems getting all the teeth to cut evenly through their coating. From our experience, we have found that uneven cutting is usually due to warped panels, or more commonly, due to bending the panels. When using the crosscut blades, it is important that the panel being scratched be supported by a flat, rigid table or surface. Additionally, sufficient force must be used for the blades to cut completely through the coating. Often this is a catch-22 situation. If your panel is not supported suf-ficiently, then more applied pressure simply bends the panel.

Improvements

The multiple tip cutters for the Paint Adhesion Test Kit are specially designed to provide optimum results. Not only are they produced to very close tolerances but also, as a final step in production they are given a black oxide coating (bluing) to prevent rusting.

Handle mounting holes do not go all the way through the cutter. This prevents cutter from being improperly secured in the handle. The holes must face the securing set screws.A further very important im-provement to the multiple tip cutter is not immediately apparent. Even with the best possible production tools and

procedures, it is very difficult to hold the tolerance on individual tooth length closer than ±0.0005 inches. Even this very small variation is just not good enough for best results from the test. An additional last step in the production process provides essentially zero tolerance on blade length. The cutters are first produced to insure a normal cut. This is then followed by a fine lateral honing which slightly modifies the teeth. There are several advantages: The teeth are stronger and less subject to damage. There is a cleaner edge cut where the coating interfaces with the supporting base. Cutter life is increased. The tolerance on tip length is greatly improved permitting lower pressure to be used on the cutter and avoiding gouging of the supporting base with a long tip.

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ADHESION

Paul N. Gardner Co., Inc. • www.gardco.com • (954) 946-9454 • 1-800-762-2478

CUTTER BLADE DIMENSIONS

PA-2053 (11 TOOTH-1.0mm CUTTER) PA-2054 (11 TOOTH-1.5mm CUTTER)

PA-2251 (4 TOOTH-3/32"CUTTER) PA-2052 (6 TOOTH-1.0mm CUTTER)

PA-2057 (6 TOOTH 3.0mm CUTTER)PA-2056 (6 TOOTH - 2.0mm CUTTER)

PA-2253 (5 TOOTH 5.0mm CUTTER) PA-2055 (11 TOOTH 2.0mm CUTTER)

PA-2257 (16 TOOTH 1.6mm CUTTER)

NEW NEW

NEW

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ADHESION

Paul N. Gardner Co., Inc. • www.gardco.com • (954) 946-9454 • 1-800-762-2478

The most popular multiple tooth adhesion cutters and related items now in use are those designed, manufactured and sold by the Paul N. Gardner Company. These cutters are available with the following tooth spacing which provides a crosshatch of segments with the indicated area:

Tooth Segment Spacing Area mm Square mm 1.00 1.00 1.50 2.25 2.00 4.00 3.00 9.00

The variable spaced multiple tooth cutter has 14 teeth providing 13 spaces between the teeth ranging from 0.46 mm to 2.58 mm. This spacing provides seg-ment areas ranging from 0.21 square mm to 6.66 square mm. At the left below is a sketch of the cutter and at the right is shown a pattern of the crosshatch cuts obtained.

SKETCH OF BLADE PATTERN

VARIABLE SPACED MULTI-TOOTH ADHESION CUTTER

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ADHESION

Paul N. Gardner Co., Inc. • www.gardco.com • (954) 946-9454 • 1-800-762-2478

RADIUSED TOOTH ADHESION CUTTER FOR PIPE. 1mm blADE ONlyMulti-tooth adhesion cutters available to date may be used only on materials applied to a flat surface. There have been numerous requests, however, for adhesion cutters for use on uniform curved surfaces such as pipe. The uniform 1 mm six tooth cutter is now available for use on such surfaces where the radius of curvature is no less than 0.75 inches. The dimensions for a cutter to be used on 0.75 inch radius pipe is shown in the following sketch:

USE OF CUTTERThe cutter for curved surfaces is mounted in the same size and style of handle as all other GARDCO multi-tooth adhesion cutters. The handle, however, is special in that the center portion of the nylon protector is removed to assist in correctly orienting the cutter on the curved surface.

This special cutter for materials applied to simple curved surfaces is produced from a modified standard multi-tooth cutter. The rake angle (the angle of the tooth tip to the back of the cutter) is accurately known. Therefore, by removing a portion of the front surface of the cutter, the tooth is shortened by a known amount. Since the shortening of the tooth is proportional to the thickness of cutter removed, the cutter may be produced to work on any given radius of curvature above a practi-cal limit of 0.75 inches.

Disclaimer: Although Paul N. Gardner Company, Inc. has attempted to provide accurate information, the Paul N. Gardner Company, Inc. assumes no responsibility for the accuracy of the information.

The following table shows the segment area in square mm for each of the segments in the variable spaced multi-tooth crosshatch pattern.

TOOTHSPACING 0.46 0.53 0.61 0.71 0.82 0.94 1.09 1.26 1.45 1.68 1.94 2.24 2.58IN mm 1.19 1.37 1.57 1.83 2.12 2.43 2.81 3.25 3.74 4.34 5.01 5.78 6.66 1.03 1.18 1.36 1.59 1.83 2.10 2.44 2.82 3.24 3.75 4.34 5.01 5.77 0.89 1.03 1.18 1.37 1.59 1.82 2.11 2.44 2.81 3.25 3.75 4.33 4.99 0.77 0.89 1.02 1.19 1.37 1.58 1.83 2.11 2.43 2.82 3.25 3.75 4.32SEGMENT 0.67 0.77 0.89 1.03 1.19 1.36 1.58 1.83 2.11 2.44 2.82 3.25 3.75AREA 0.58 0.67 0.77 0.89 1.03 1.18 1.37 1.58 1.82 2.11 2.44 2.82 3.24IN 0.50 0.58 0.66 0.77 0.89 1.02 1.19 1.37 1.58 1.83 2.11 2.44 2.81Sq. mm 0.43 0.50 0.58 0.67 0.77 0.89 1.03 1.19 1.37 1.58 1.83 2.11 2.43 0.38 0.43 0.50 0.58 0.67 0.77 0.89 1.03 1.18 1.37 1.58 1.83 2.11 0.33 0.37 0.43 0.50 0.58 0.66 0.77 0.89 1.03 1.19 1.37 1.58 1.82 0.29 0.33 0.38 0.44 0.51 0.58 0.68 0.78 0.90 1.04 1.20 1.39 1.60 0.23 0.27 0.31 0.36 0.41 0.47 0.55 0.63 0.73 0.85 0.98 1.13 1.30 0.21 0.24 0.28 0.33 0.38 0.43 0.50 0.58 0.67 0.77 0.89 1.03 1.18

SEGMENT AREA TABLE

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