Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of ashm limitations prior to use. Each dolly has a nominal diameter of see however following paragraph and sufficient thickness to ensure freedom from distortion during the test. Pull-Off Test for Adhesion Keywords Paints, Varnishes, Coatings, Adhesion tests, Tensile stress, Mechanical testing, Tensile testing, Test equipment, Testing conditions To find similar documents by classification: 87. Repeat the series of tests using at least six more test assemblies.
The test result is influenced not only by the mechanical properties of the system under test, but also by the nature and preparation of the substrate, the method of paint application, the drying conditions of the coating, the temperature, the humidity and other factors like the type of test instrument which has been used. It also provides descriptive classes for the assessment of the average size of the dust particles. The test may be applied using a wide range of substrates. The items of supplementary information are given in annex A. If cuts around the dolly have been made, this shall be mentioned in the test report and the type of cutting tool also mentioned. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Dimensions in millimetres Key 1 Test assembly aligned for adhesion process see 5.
The substrate panels shall be plane and free from distortion. For undated references, the latest edition of the normative document referred to applies. It is permitted, if specified or agreed between the interested parties, not to cut when the paint systems are less than in layer thickness. In special tests under highly humid conditions, the curing time of the adhesive shall be as short as possible. This includes change in glue, load fixture size, substrate coating cure time, pull rate, environmental conditions, if the coating is scored, or using a different device. Apply the adhesive evenly to the surfaces of two freshly-cleaned dollies 5.
A means of aligning the base is composition should be reported for subsequent analysis orneeded x4541 that the resultant force is normal to the surface. Annex A forms a normative part of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. Preliminary screening of adhesives shall be carried out in order to determine their suitability for use. Key 1 Coating 2 Test piece 3 Dolly 4 Ball-and-socket sliding joint 5 Support suitably designed to allow for joint assembly 6 Ball-and-socket sliding joint Figure 2 — Example of a suitable test apparatus for the method described in 9.
Please click here to view the new model - Please contact us for pricing and availability. Use the minimum quantity of adhesive required to produce a firm, continuous and even bond between the components of the test assembly. Repeat the series of tests using at least six more test assemblies. Key 1 2 Support Ball joint 3 4 Dollies Coating 5 Substrate Figure 1 — Example of a suitable test apparatus for the methods described in 9. Take care not to distort the test piece. For example, for special purposes, the coating may be applied directly to the face of a test dolly. Essai de traction Title in German Beschichtungsstoffe.
Depending on the mechanical properties of the paint system e. Also, what would be the minimum pull-off strength for a multiple coat system with in mind that after sweeping it is covered with a new 3-coat alkyd system. If scoring rather than on the coating surface. These test methods have been found useful in comparing the adhesion behaviour of different coatings. Estimate the area of fracture as a percentage to the nearest for each type of fracture.
Cyanoacrylates, sometimes react with alkyd coatings! The faces of each dolly shall be machined perpendicular to its axis before use. Load evenly distributes pulling force over thesurface being tested, ensuring a perpendicular, balanced pull- A4. Regardless, to answer your question, if the test results are valid, the type of break within the cross section of the coating system adhesive, within primer, intermediate, topcoat, or % of each is most relevant, along with the tensile stress applied to the coating, the testing apparatus, and the type of adhesive used was there any interaction between the adhesive and the coating system? The use of two-pack quick-drying epoxy adhesive is preferable in these situations. Align the test assembly in the centering device 5. Suitable designs for applying the tensile stress are shown in Figures 1 and 2.
Dollies with a diameter of 7 mm may be used when the method for testing adhesion from one side only is used see 9. Surface roughness characteristics of blast-cleaned steel substrates Replica tape method for the determination of the surface profile. It is recommended that the length of each dolly is not less than half its diameter. In order to standardize andmay be caused by a mistake in recording or calculating. It outlines methods for determining adhesion by carrying out a pull-off test on a single coating or a multi-coat system of paint, varnish or related product. Good Luck Ken Tator - Pittsburgh, Pennsylvania January 12, 2012 Thanks for the information Ken. Approved February 1, Lead Time Varies, Please contact us for availability.