1、 FORD LABORATORY TEST METHODFLTM BO 162-01 Date Action Revisions Rev 0 2009 01 22 Activated New method replacing BN 108-13 L. Sinclair, FNA Printed copies are uncontrolled Copyright 2009 Ford Global Technologies, Inc. Page 1 of 4 RESISTANCE TO SCRATCH AND MARR Application This procedure is used to d
2、etermine the resistance to scratching, whitening and marring on surfaces of plastic or other materials under standard conditions. For the scratch, whitening and marring evaluation the acceptance criteria and ratings can be independently selected based on the application. Apparatus Required Mechanica
3、lly Driven Scratch Apparatus Apparatus is a movable sledge with five metal fingers - 250 mm long, one end fixed, the other end of fingers are supplied with interchangeable scratch pins (steel balls, highly polished, 1.0 +/- 0.1 mm diameter). The pins are loaded with different weights exerting the fo
4、llowing standard forces on the surface of test material: Scratch finger No. 1 15.0 N 2 10.0 N 3 7.0 4 3.0 N 5 2.0 Note: If necessary it is possible to move/change the weight(s) on the scratch finger(s) so that force(s) can be differentiated. The complete apparatus should be purchased from the follow
5、ing or equivalent approved by Materials Engineering: Rockwood Systems and Equipment, INC 34303 Industrial Road Livonia, MI 48150 Phone: (734) 525-9140 FORD LABORATORY TEST METHODFLTM BO 162-01 Printed copies are uncontrolled Copyright 2009 Ford Global Technologies, Inc. Page 2 of 4 Spring Balance 15
6、 N maximum or functionally equivalent electronic force transducer Viewing Cabinet As described in FLTM BI 109-01 Stop Watch Samples for Visual Evaluation (Method A) Flat, recommended size 200 x 150 mm; smaller samples are acceptable if extracted from finished parts. Conditioning and Test Conditions
7、All test values indicated herein are based on material conditioned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 % relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. Procedure 1. Install the 2N, 3N, 7N, 10N, and 15N scra
8、tch pins and 1.0 mm diameter balls or as specified by the relevant engineering document, under the fingers. 2. Check the loading forces, measured directly at the scratch pin by using spring balance. If necessary change the weight(s) to meet the required scratch force(s) on the surface of sample. 3.
9、Place the sample - grain on the top - with the short side of sample under the five scratch fingers and push them one time from right to left across the sample at the rate of approximately 100 mm per second, length of scratch lines 200 mm recommended length. Control the scratch speed by using a stop
10、watch. 4. Mark the direction of outlined movement by labeling the load at the beginning of the test line. 5. Document the evaluation technique on the test report as either visual evaluation or Instrumental evaluation. Method A (Visual Evaluation) 1. Use north sky day light according to FLTM BI 109-0
11、1. 2. Place the sample under the light so that the scratch lines are in a horizontal position to the observer. The scratch line caused by the highest weight should be at the upper position. 3. Disregard the start and end 10% of the scratch line. 4. Evaluate only the center 80% of the scratch line ac
12、cording to the rating scale below. The evaluation should take place rotating the sample in all angles at a distance of approximately 300 mm. FORD LABORATORY TEST METHODFLTM BO 162-01 Printed copies are uncontrolled Copyright 2009 Ford Global Technologies, Inc. Page 3 of 4 Scratch Defined as a deform
13、ation or cutting of the grained/ungrained surface. Rating Scale Scratch (Deformation) Requirement Rating 1 No deformation at any angle Rating 2 Deformation visible at some angles, no more than 30% of the evaluated lines at all angles shall show deformation. Note: The 30% does not need to be a contin
14、uous line Rating 3 Deformation present at all angles Whitening/Color Change Defined as a white line or color change visible at all angles for mold in color materials. Rating Scale Whitening/Color Change Requirement Rating 1 White line/Color Change not present at all angles Rating 2 Visible white lin
15、e/ Color Change present at all angles Marring Defined as a gloss change or burnishing with no deformation or whitening of the surface. Rating Scale Marring Requirement Rating 1 No gloss change visible at any angle Rating 2 Gloss change visible at some angles Rating 3 Gloss change visible at all angl
16、es. Example (FLTM BO 162-01, Method A - Visual Evaluation) Scratch: Rating 2 max at 15N Whitening Rating 2 max at 7N Marring : Rating 2 max at 2N Method B (Instrumental Evaluation - Image Analysis System) TBD FORD LABORATORY TEST METHODFLTM BO 162-01 Printed copies are uncontrolled Copyright 2009 Ford Global Technologies, Inc. Page 4 of 4 RESISTANCE TO SCRATCHING Figure 1 Figure 2: Photograph of the scratch tester
