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. APRIL 2017 Page 1 of 2 NAVISTAR, INC. Material, Parts, and Process Specifications
2、(MPAPS) NUMBER: MPAPS DT-20 Former Designation: TITLE: Test Procedure for Evaluating Surface Stress in Electroplated ABS Plastics CURRENT REV No.: 1704 DATE: APR. 2017 WRITTEN/EDITED BY: J. Jamison APPROVED BY: R. Goluch SUPERSEDES: N/A PRINTED COPIES OF THIS DOCUMENT MUST BE VERIFIED FOR CURRENT RE
3、VISION 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 regu
4、latory limits prior to use. 1.0 APPLICATION This method is for qualitatively evaluating the stress state of test panels or production parts, before being plated to ensure durability of material after plating. It applies to ABS-based molded plastic parts that are to be decorative electroplated with c
5、hromium for both interior and exterior use Per MPAPS G-7051. Example parts are exterior grilles, light bezels, nameplates, interior ornaments, knobs, and the like. 2.0 SCOPE This test method provides a procedure to evaluate raw ABS moldings for surface stress, rubber dispersion in the surface, and i
6、nternal stress. This is not a quantitative test and should be used only for identifying and correcting serious stress or rubber distribution problems in raw ABS moldings. It is based on American Society of Electroplated Plastics Test Procedure 203. 2.1 Restricted Chemical Substances All product supp
7、lied 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 Regulations are referenced in t
8、his specification. NAVISTAR MPAPS G-7051 NAVISTAR MPAPS B-50 ASEP TP-203 4.0 APPARATUS AND MATERIALS 4.1 Apparatus 4.1.1 A thermometer for checking temperature. 4.1.2 A glass or plastic container large enough to immerse the part to be tested completely. 4.2 Materials 4.2.1 Interior trim plastic comp
9、onent or test panels taken from the part. 4.2.2 Exterior trim plastic component or test panels taken from the part. NUMBER: MPAPS DT-20 TITLE: Test Procedure and Standards for Electroplated Plastics REVISION: 1704 This document is restricted and may not be sent outside Navistar, Inc. or reproduced w
10、ithout permission from Corporate Technical Standards. Suppliers are required to assume all patent liability. 2017 by Navistar, Inc. APRIL 2017 Page 2 of 3 4.3 Chemicals Acid should be stored in a sealed container to prevent moisture absorption from the air. Do not contaminate the acid with water. Do
11、 not dip wet parts in the acid. 4.3.1 Anhydrous, reagent- grade acetic acid 5.0 TEST METHOD 5.1 Totally immerse the part to be tested in concentrated glacial acetic acid at 24C 3C (75F 5) for 30 sec. 5.2 Immediately rinse the part in running water to remove the acetic acid, and allow it to dry at ro
12、om temperature. 5.3 Evaluate the part for surface stress and rubber distribution. 5.4 After making sure the part is dry, totally immerse the part again in the concentrated glacial acetic acid at 24C 3C (75F 5) for 2 min. 5.5 Immediately rinse the part in running water to remove the acetic acid, and
13、allow it to dry at room temperature 5.6 Evaluate the part for internal stress. 6.0 INTERPREATION 6.1 Surface stress is indicated in step 5.3 by small dense patterns appearing on the part surface. The more prevalent and dense the pattern, the higher the stress. 6.2 Rubber distribution in the surface
14、is indicated by the color in step 5.3. Poor moldings will have heavy, white areas and dark, shiny areas on the same part, indicating non-uniform dispersion of the rubber phase. 6.3 Cracking entirely through the thickness of the plastic in step 5.6 is an indication of very high internal stress in the
15、 part. Again, the severity of the cracking indicates the severity of the stress. 7.0 REPORT 7.1 The report should include the manufacturer of the ABS, the grade, the lot number, and the molding conditions. 7.2 The report should identify the degree of color variation and cracking and the locations on
16、 the part. 8.0 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:
17、MaterialsEngineeringN IHS Markit Inc. 15 Inverness Way East Englewood CO 80112-5776 Phone: 1-800-854-7179 E-mail: AutomotiveIHS.com Website: http:/ NUMBER: MPAPS DT-20 TITLE: Test Procedure and Standards for Electroplated Plastics REVISION: 1704 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. APRIL 2017 Page 3 of 3 REVISION HISTORY Revision Level Change Approved by Date Approved 1717 Initial Release R. Goluch 4/28/2017
