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. 2017 by Navistar, Inc. FEBRUARY 2017 Page 1 of 4 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.: 1702 DATE: Feb. 2017 WRITTEN/EDITED BY: D. Baker APPROVED BY: R. Goluch SUPERSEDES: 1402 Feb. 2014 PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT REVISION
3、 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 the applicability of regulatory
4、 limits prior to use. 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 the susceptibility of hard plastic trim to scratching, marring, gouging, and other damage. 2.1 Restricted Chemical
5、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 specified, the latest issue of all referenced standards shall apply. The following Specifications, Standards, and Regu
6、lations 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 FLTM B0 162-01 FORD FLTM BI 109-01 GMW 14688 ISO 7724 4.0 TEST METHODS Samples may be tested by either of the fo
7、llowing 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 performed must be approved by Navistar Design or Materials Engineering prior to testing and the p
8、rocedure used must be submitted along with the results to the responsible Navistar party. Requirements listed on part drawings take precedence over the following test procedure. Any changes or altercations to the below method must be documented in the report. NUMBER: MPAPS DT-16 TITLE: SCRATCH AND M
9、AR TESTING FOR HARD PLASTIC TRIM REVISION: 1702 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. 2017 by Navistar, Inc. FEBRUARY 2017 Page 2 of 4 4.1 Test
10、 Method A: Taber Multi-finger Scratch Test (FLTM BO 162-01) 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 temperature and humidity should be recorded in the lab report). 1.0 mm diamet
11、er polished stainless steel balls shall be used as scratch tips. 7.0 mm diameter polished stainless steel balls shall be used as mar 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 is
12、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 15.0 N 2 10.0 N 3 7.0 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 (FLTM BI 109-01) Scratch - Defined as a deformation or cutting of the grained/ungrained surface Rating Scale Scratch (Deformation)
16、 Requirement Rating 1 No deformation at any angle Rating 2 Deformations 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 continuous line Rating 3 Deformation present at all angles Whitening/Color Change - Define
17、d as a white line or color change visible at all the 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 line/Color Change present at all angles NUMBER: MPAPS DT-16 TITLE: SCRATCH AND MAR
18、 TESTING FOR HARD PLASTIC TRIM REVISION: 1702 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. 2017 by Navistar, Inc. FEBRUARY 2017 Page 3 of 4 Marring -
19、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 angles Take a digital picture of the scratched sam
20、ple plaque and submit to Navistar Engineering. Microscopic evaluation should be performed following the visual evaluation. The sample should be held at a 90-degree angle to the microscopic objective. Using a suitable magnification, measure the width of the scratch lines. Average the measured widths
21、for the three repeats and report the average width to Navistar Engineering along with visual results 4.2 Test Method B: Erichsen Scratch and Mar Test (GMW14688 A-scratch; B-Mar) 4.2.1 Test Apparatus: Erichsen Hardness Tester Model 430P or similar 4.2.2 Test Procedure: All tests shall be carried out
22、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 scratch tip. All tips should be evaluated prior to testing under a microscope to insure the surfaces are intact and free of
23、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: 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 g
24、eometry 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 should 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. M
25、ake 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 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 eva
26、luated in five locations: one in the center and four in the corners. A spectrophotometer that meets ISO 7724 should be used for analysis. Measure the luminance of each screen immediately following the scratch test. All spectrophotometer measurements shall be taken with the specular component exclude
27、d (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. The measurements taken at each of the five locations per screen should be averaged and reported to Navistar Design and Materials Engineering. NUMBER: MPA
28、PS DT-16 TITLE: SCRATCH AND MAR TESTING FOR HARD PLASTIC TRIM REVISION: 1702 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. 2017 by Navistar, Inc. FEBRU
29、ARY 2017 Page 4 of 4 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 6016
30、0 E-mail: MaterialsEngineeringN IHS Markit Inc. 15 Inverness Way East Englewood CO 80112-5776 Phone: 1-800-854-7179 E-mail: AutomotiveIHS.com Website: http:/ A.0 GENERAL INFORMATION REVISION HISTORY Revision Level Change Approved by Date Approved 1702 Revised reference test method for Taber to FTLM BO 162-01, added evaluation method and criteria. Added Erichsen mar test. R. Goluch 2/24/2017
