1、This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2014 by Navistar, Inc. FEBRUARY 2014 Page 1 of 3 NAVISTAR, INC. Material, Parts, and Process Specificatio
2、ns (MPAPS) NUMBER: MPAPS DT-16 Former Designation: CEMS DT-16 TITLE: Scratch and Mar Testing for Hard Plastic Trim CURRENT REV No.: 1402 DATE: Feb. 2014 WRITTEN/EDITED BY: Materials Engineering APPROVED BY: Materials Engineering SUPERSEDES: CEMS DT-16 April 2013 PRINTED COPIES OF THIS DOCUMENT MUST
3、BE VERIFIED FOR CURRENT REVISION This specification may involve hazardous materials, equipment, and procedures. This specification does not purport to address all of the safety issues associated with its use. The user is responsible to consult appropriate safety and health practices and to determine
4、 the applicability of regulatory limits prior to use. Change Notice: New format; major content and testing changes; editorial changes. 1.0 APPLICATION This specification applies to all hard trim plastic surfaces on the truck interior. 2.0 SCOPE This specification covers a test method to determine th
5、e susceptibility of hard plastic trim to scratching, marring, gouging, and other damage. 2.1 Restricted Chemical Substances All product supplied to the requirements of this specification must comply with the requirements of the MPAPS B-50 specification. 3.0 REFERENCE DOCUMENTS Unless otherwise speci
6、fied, the latest issue of all referenced standards shall apply. The following Specifications, Standards, and Regulations are referenced in this specification. NAVISTAR MPAPS B-50 Taber Multifinger Scratch/Mar Tester 710 product literature Erichsen Scratch Hardness Tester 430P product literature FORD
7、 FLTM BN 108-13 GMW 14688 ISO 7724 4.0 TEST METHODS Samples may be tested by either of the following test methods. Test Method A is based on the Taber Multifinger Scratch and Mar test and Ford five finger test. Test Method B is based on the Erichsen and GM scratch and mar tests. The test method perf
8、ormed must be approved by Navistar Design or Materials Engineering prior to testing and the procedure used must be submitted along with the results to the responsible Navistar party. Requirements listed on part drawings take precedence NUMBER: MPAPS DT-16 TITLE: SCRATCH AND MAR TESTING FOR HARD PLAS
9、TIC TRIM REVISION: 1402 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2014 by Navistar, Inc. FEBRUARY 2014 Page 2 of 3 over the following test procedur
10、e. Any changes or altercations to the below method must be documented in the report. 4.1 Test Method A: Taber Multi-finger Scratch Test 4.1.1 Test Apparatus: Taber Multi-Finger Scratch/Mar Tester Model 710 or similar 4.1.2 Test Procedure: All tests shall be carried out at ambient conditions (exact t
11、emperature and humidity should be recorded in the lab report). 1.0 mm diameter polished stainless steel balls shall be used as scratch tips. All tips should be evaluated prior to testing under a microscope to insure the surfaces are intact and free of defects or evidence of deterioration. If a tip i
12、s defective, it should be replaced with a new tip prior to testing. Each tip should be pre-loaded with the following weights: Scratch finger number: 1 7.0 N 2 6.0 N 3 4.5 N 4 3.0 N 5 2.0 N Sample plaques should be molded in color a minimum of 300 mm in length. Separate plaques should be molded if in
13、terior trim parts are to have different colors or textures/ grains. The plaques should be securely loaded in the instrument with the grain side up. Measure the loading forces on each pin using a spring balance; adjust the weights to insure the correct forces are applied on the surface of the sample.
14、 Push the fingers, one at a time, across the sample plaque at an approximate rate of 100 mm per second. Each scratch line should be approximately 200 mm in length, or two seconds per scratch. Indicate the direction of the movement on the sample. Repeat the scratch test on a minimum of three test sam
15、ples. 4.1.3 Sample Evaluation: Perform both a visual and microscopic analysis of the scratches. Visually evaluate the sample by holding the sample under natural lighting. Tilt the sample back and forth in hands until the scratches appear the widest and most visible. Qualitatively rate the middle sec
16、tions of the scratches on a scale of 1 to 5 (1 is no scratch at all; 5 is a severe scratch). Additionally take a digital picture of the scratched sample plaque and submit to Navistar Engineering. Microscopic evaluation should also be performed following the visual evaluation. The sample should be he
17、ld at a 90 angle to the microscope objective. Using a suitable magnification, measure the width of the scratch lines. Average the measured widths for the three repeats and report the average width to Navistar Engineering along with the visual results. 4.2 Test Method B: Erichsen Scratch and Mar Test
18、 4.2.1 Test Apparatus: Erichsen Hardness Tester Model 430P or similar 4.2.2 Test Procedure: All tests shall be carried out at ambient conditions (exact temperature and humidity should be recorded in the lab report). A 1.0 mm diameter (0.5 mm radius) polished stainless steel ball shall be used as a s
19、cratch tip. All tips should be evaluated prior to testing under a microscope to insure the surfaces are intact and free of defects or evidence of deterioration. If a tip is defective, it should be replaced with a new tip prior to testing. Tips should be pre-loaded with the following weights: NUMBER:
20、 MPAPS DT-16 TITLE: SCRATCH AND MAR TESTING FOR HARD PLASTIC TRIM REVISION: 1402 This document is restricted and may not be sent outside Navistar, Inc. or reproduced without permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2014 by Navistar, Inc. F
21、EBRUARY 2014 Page 3 of 3 Defined Loads: 1 5.0 N 2 10.0 N 3 15.0 N 4 other as specified by drawing Sample plaques should be molded in color with a minimum geometry of 40 mm x 40 mm. Separate plaques should be molded if interior trim parts are to have different colors or textures/grains. The plaques s
22、hould be securely loaded in the instrument with the grain side up. Load the tool with the first required rate and pull it over the sample at 1000 mm/min. Make 20 parallel cuts in the material 2 mm apart. Next turn the sample 90 and make 20 additional cuts perpendicular to the initial cuts, also 2 mm
23、 apart. The test should be repeated three times for each load creating separate scratch screens. 4.2.3 Sample Evaluation: Each scratch screen should be evaluated in five locations: one in the center and four in the corners. A spectrophotometer that meets ISO 7724 should be used for analysis. Measure
24、 the luminance of each screen immediately following the scratch test. All spectrophotometer measurements shall be taken with the specular component excluded (SPE) with D65 diffused light and a 27 mm diameter restrictor at a measurement angle of d/8. The plaques should be tested for medium brilliancy
25、. The measurements taken at each of the five locations per screen should be averaged and reported to Navistar Design and Materials Engineering. 5.0 TECHNICAL INFORMATION For further information related to the technical content of this specification, contact: Suppliers may purchase controlled copies of this specification by contacting: Materials Engineering and Technology Dept. 10400 W. North Avenue Melrose Park, IL 60160 E-mail: MaterialsEngineeringN IHS Global Inc. 15 Inverness Way East Englewood CO 80112-5776 Phone: 1-800-854-7179 E-mail: AutomotiveIHS.com Website: http:/
