BS ISO 9211-4:2012 pdf free download.Optics and photonics一Optical coatings Part 4: Specific test methods. Unless otherwise required in the relevant specification, visual discolourations of the coating such as stains, smears, streaks or cloudiness shall be acceptable if the specimen conforms to the optical and other environmental durability requirements of the relevant specification. 7 Crosshatch test (conditioning method 03: crosshatch) 7.1 General The purpose of this test is to evaluate to what extent the adhesion properties of opticai coatings on components and substrates are affected after cutting the coating (distorting the stress and influencing the adhesion). 7.2 Test conditions 7.2.1 Use a cutting device [e.g. a razor blade (suitable for soft substrates) or a diamond scribe] to make six parallel cuts in the coating. 1,5 mm ± 0,5 mm apart and approximately 15 mm to 20 mm in length, when the dimensions of the specimen permit. Cut through the coating completely but do not cut too deep into the substrate. Rotate the sample and in the same way make six parallel cuts perpendicular to the first set of cuts. Check the cut pattern for flakes or other irregularities and record the results. 7.2.2 Apply adhesive tape as specified in 6.2.1 over the crosshatch pattern in accordance with 6.2.2 to 6.2.5. 7.3 Conditioning Remove the tape at an angle perpendicular to the coated surface at a snap rate (much less than 1 s per 25 mm). 7.4 Recovery Do not clean the specimen prior to evaluation. 7.5 Evaluation Rate the crosshatch results according to Table 3. Magnification may be used.BS ISO 9211-4 pdf download.
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