The Cross Hatch Paint Adhesion Test Kit (P.A.T.) produced by Gardco is a visual adhesion test used for evaluating adhesion by cutting the paint or coating into small squares, thereby reducing lateral bonding. BLADES SOLD SEPARATELY, find them in the Accessories section below.
|Tooth Spacing / mm||Cross Hatch Segment Area Square / mm|
|Variable Spaced Blade (12599)|
|The following table shows the segment area in square mm for each of the segments in the variable spaced multi-tooth crosshatch pattern. 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 segment areas ranging from 0.21 square mm to 6.66 square mm.|
|Tooth Spacing in mm||0.46||0.53||0.61||0.71||0.82||0.94||1.09||1.26||1.45||1.68||1.94||2.24||2.58|
|Segment Area in|
Cross Hatch Blades - 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 the cutter from being improperly secured in the handle. The holes must face the securing set screws. A further very important improvement 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 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
As general guide for coatings having a dry film thickness up to and including 2.0 mils (50 µm) space the cuts 1 mm apart and make eleven cuts (12603) unless otherwise agreed upon. For coatings having a dry film thickness between 2.0 mils (50 µm) and 5 mils (125 µm), space the cuts 2 mm apart and make six cuts (12610) unless otherwise agreed upon. For coatings having a thickness greater than 5 mils (125 µm) space the cuts 5.0 mm apart and make 5 cuts (12633) unless otherwise agreed upon.
Radius Blade - 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. 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 practical limit of 0.75 inches. The cutter for radius 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 notched to assist in correctly orienting the cutter on the curved surface. Radius Blades available for the 14407 Kit - call for more information.
Note: For 2.0mm blade, the two outer "outrigger" teeth are for stability only
12633 is for conducting adhesion tests on coatings having a thickness greater than 5 mils (0.005") (125 microns).
12607 Carbide Tip (1.5 mm spacing) 11 Teeth - 5 piece minimum availble upon request - call for pricing.
Meets ASTM Test Method D3359, F1842; ISO 2409; Method B; DIN Standard No. 53151
Note: 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 black thin 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 (or cross-hatch) adhesion blades have had problem 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. 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 sufficiently, then more applied pressure simply bends the panel.
14407 Paint Adhesion Test Kit for curved surfaces includes (2) 12614 blade holders / handles with nylon protector and guide, hex wrench for changing blades, flaking brush, 5x LED hand held magnifier w/batteries (magnifier has 2 LED lights and 1.5" glass lens), Polyester Rope Fiber Laminate tape (12648), instruction guide, and a sturdy plastic carrying case with handle. All of the components are nested in diecut foam within the case. Blades sold separately, choose curved blade for trans radius cut, or call us for a custom size above .75", and add the (12600) straight blade for the longitudinal cut (also required).