1、 FORD LABORATORY TEST METHOD BI 165-01 Date Action Revisions Rev. 00 2017 05 03 Released Matthew Corley, EU Controlled document at www.MATS Copyright 2017, Ford Global Technologies, LLC Page 1 of 4 MICRO-SCRATCH RESISTANCE FOR HIGH GLOSS DECORATIVE SURFACES Application This procedure is used to eval
2、uate the micro-scratch performance of high gloss automotive materials (i.e. paint, resin, coatings). Apparatus and Materials Required Crockmeter Standard mechanically driven crockmeter with the ability to meet the following requirements: Table 1: Force applied to sample 9 N Length of Scratch line 80
3、-100 mm Speed of Crockhead 1 Hz Micro-scratch Head Micro-scratch head shall meet VDA Guideline 230-208-2 (2015) and DIN 55654. The width of the crocking head is 25 mm ( 0.5 mm). The head is curved with a radius of 19 mm ( 0.5 mm). The head of the crocking head is covered with EPDM open cell foam wit
4、h a Shore 00 hardness of 605. Movement of the microscratch head relative to the sample is perpendicular to the axis of the surface curvature. The foam should be inspected regularly and replaced if defects or damages are visible. Figure 1a: Disassembled condition, 1b: Micro-scratch head in assembled
5、condition with lapping film. FORD LABORATORY TEST METHOD BI 165-01 Copyright 2017, Ford Global Technologies, LLC Page 2 of 4 Source Microscratch Head and Foam: Ord.-No. 1910.01.32, Crockmeter test head acc. BMW AA-0134 Erichsen GmbH & Co. KG Ldorfstr. 24 42281 Wuppertal, Germany +49 202 707207 infoe
6、richsen.de Lapping Film 3M 261X Aluminum Oxide Lapping Polyester film with 5 m grain size. (brown) or equivalent Glossmeter Standard Glossmeter (capable of 20 and 60). Test Panel Flat test panels should be used to allow for an accurate gloss reading. The panels should be black, ungrained, homogeneou
7、s, and clean. Panels should be 100 mm x 150 mm and 2-3.5 mm thick. It should be noted that using non flat panels can falsify the results. Samples must be free of dust, water spots, oil/grease/fingerprints and other contaminants which may affect test results. If needed, the recommended cleaning proce
8、dure is with lukewarm water and a mild nonabrasive detergent. The detergent must not leave a residue on the surface of the sample after cleaning. Cloth, sponges or brushes should not be used for cleaning, but gentle use of fingers is acceptable. Following this the samples should be rinsed with disti
9、lled water. Samples should be inspected for impurities before testing. Subsequently, the handling of the test panels and the lapping film should be carried out with cotton gloves to avoid contamination from skin oils, etc. For injected Molded in Color thermoplastic panels the direction of flow in th
10、e panel should be documented. The direction of scratch pattern should be in the flow direction of the panel and noted in the test report. Test Procedure Note: When comparing micro-scratch performance of different systems the same color should be used. 1. On 3 clean panels measure gloss at multiple p
11、ositions on each panel (Pre-gloss measurement). The exact location of the measurements can be chosen freely, but should be evenly distributed about the panel. If gloss measurements show a high standard deviation then a higher quantity of measurements should be made to calculate the average gloss. Se
12、e Table 2 for the recommended number of gloss measurements. Table 2: Required number of gloss measurements per panel Material Std. Dev. 2 Std. Dev 2 High Gloss Paints 4 10 High Gloss MIC Resins 10 10 High Gloss films/appliques 4 10 Other surfaces 10 10 FORD LABORATORY TEST METHOD BI 165-01 Copyright
13、 2017, Ford Global Technologies, LLC Page 3 of 4 Note: The quantity of gloss measurements listed above for pre-gloss is for the panel and after scratch is for each scratch line 2. Install a new 25 mm x 75 mm Lapping film on the Micro-scratch head (Figure 1a). A new lapping film should be used for ea
14、ch scratch line. 3. Run 5 cycles of the micro scratch test per Table 1 on two locations on each of the 3 panels as shown in Figure 2. Note one cycle is defined as one stroke forward and one back. Figure 2: Sample panels with scratch lines 4. Inspect the panels and remove any shavings, dirt, oil or o
15、ther impurities (compressed air, water, etc.). 5. Store the panels for the length of time as specified in appropriate specification. 6. Measure the gloss of each scratch line after specified hold time (Post gloss measurement). The gloss measurements made on the scratched area should be distributed o
16、ver the scratched surface at multiple locations as identified in Table 2. Ensure that the measurement area of the glossmeter is entirely on the scratched area (i.e. not half on half off at the edge of the scratch line). 7. The gloss retention is calculated for each scratch line by dividing the avera
17、ge gloss measurements made on the scratch line by the average of the gloss measurements made on the panel before it was scratched. Gloss Retention in % = x 100% Report Out The following information should be entered into the test report Initial Panel Gloss (overall average and average of each of the
18、 3 panels) Gloss retention (overall average and average of each of the 6 lines) Material tested (Manufacturer and Trade name) and any other relevant details to sample manufacture Dimensions of samples FORD LABORATORY TEST METHOD BI 165-01 Copyright 2017, Ford Global Technologies, LLC Page 4 of 4 Color (including Ford Color/Alpha Code) Crockmeter manufacturer and model number Microscratch head manufacturer and model number Glossmeter manufacturer, model number, and degree of measurement Position of scratch lines (description or photo)
