#Paint scribe definition free

Following a brief “recovery” period of about 60 seconds the tape is removed by grasping the free end of the tape and pulling it off rapidly (not jerked) back upon itself at as close to an angle of 180° as possible. Once the incisions are made, a pressure sensitive tape (with adhesive properties conforming to the requirements of the standard Figure 1) is applied over the incisions and pressed in place using a pencil eraser. Straight cuts and, in the case of the X-cut, the correct angle at the intersection For both methods,Ī steel or other hard metal straightedge or template is recommended to ensure For coatings betweenĢ mils and 5 mils thick, six incisions are spaced 2 mm apart. Thick, eleven incisions are made that are spaced 1 mm apart. When the coating is less than 5-mils thick, aĬross-cut lattice pattern is created with either six or eleven cuts in each When the coating is greater than 5-mils thick, an X-cut (with each legĪpproximately 1.5-inches long) is made into the film. Rapidly pulling the tape from the surface. Tests are performed by scribing the coating to the substrate with a sharp knifeīlade in a specific pattern, applying a pressure sensitive tape and then The test wasĭeveloped for assessing the adhesion of coating to steel but can be used onīeen used successfully on softer substrates (e.g., wood and plaster). Method can be performed in the shop, field or laboratory. Intended for use on coatings/coating systems over 5 mils (125 µm), while Methodī is generally used on coatings/coatings systems less than 5 mils thick. Test methods are described in ASTM D3359: Method A (X-cut), and Method B Posted to KTA University in 2018 titled, “ Coating Adhesion Testing using Knife/Tape Methods.” Test Description information in the following section was extracted from anĪrticle written by Raymond Tombaugh, Sr. This article includesĪn overview of the testing procedures and presents some common pitfalls Yet there are many potential issues andĬhallenges with successfully performing such a basic test. It is relatively easy to perform and does not Performed in the laboratory, shop, or field on both newly applied and aged First published inġ974, it is widely used in a variety of industries and applications. Most frequently downloaded standards from Volume 06.01. Responsible for maintaining standards developed by Committee D01, “PaintĪnd Related Coatings, Materials and Applications,” ASTM D3359, “Standard Test Methods for Rating Adhesion by Tape Test” is one of the

Paint scribe definition