1、 ENGINEERING MATERIAL SPECIFICATION Material Name Specification Number Date Action Changes 2010 01 08 N-STATUS No replacement named J. Crist, NA 1989 08 31 SM/EQ7118 TP Released KH Gerhards WP 3948-a Page 1 of 4 PVC/NBR MOLDING COMPOUND, FLEXIBLE, EXTERIOR WSK-M4D661-A NOT TO BE USED FOR NEW DESIGN
2、1. SCOPE The material defined by this specification is a flexible, UV resistant polyvinyl chloride/acrylonitrile butadiene rubber (PVC/NBR) moulding compound. 2. APPLICATION This specification was released originally for material used for extruded bumper stone deflectors. 3. REQUIREMENTS 3.1 STATIST
3、ICAL PROCESS Suppliers must conform to the requirements of Ford Quality System Standard Q-101. A mutually acceptable Control Plan as described therein is required for material/source approval. Appropriate statistical tools must be used to analyze process/product data so that variation in the final p
4、roduct is continuously reduced. 3.2 INFRARED SPECTROPHOTOMETRY AND/OR THERMAL ANALYSIS Ford Motor Company, at its option, may conduct infrared and/or thermal analysis of material/parts supplied to this specification. The IR spectra and thermograms established for initial approval shall constitute th
5、e reference standard and shall be kept on file at the designated material laboratory. All samples shall produce IR spectra and thermograms that correspond to the reference standard when tested under the same conditions. 3.3 CONDITIONING AND TEST CONDITIONS All test values indicated herein are based
6、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. 3.4 MOLDED TEST SPECIMEN 3.4.1 Preparation of Test Specimens Unless otherwise specified, all test
7、 shall be conducted on specimens die cut from ungrained compression molded plaques 150 x 150 x 2.0 +/- 0.2 mm molded according to ISO 293. ENGINEERING MATERIAL SPECIFICATION WSK-M4D661-A WP 3948-b Page 2 of 4 3.4.2 Density, max 1.30 g/cm (ISO 1183, Method A/ASTM D 792, Method A) 3.4.3 Hardness, Duro
8、meter A 60 +/- 5 (ISO 868/ASTM D 2240, 6 mm thick plied-up specimens, 15 s delay.) 3.4.4 Tensile Strength at Break, min 8 MPa (ISO R 527, type 2/ASTM D 638M, type M-II, 500 mm/min test speed) 3.4.4.1 Elongation at Break, min 400 % (Test Method according to para 3.4.4) 3.4.5 Tear Strength, min 25 kN/
9、m (ISO 34,Method B, Procedure a/ASTM D 624, Die C) 3.4.6 Cold Flexibility at - 40 C No cracks (FLTM BN 102-1, except specimen 25 x 150 mm, minimum and 19-20 mm mandrel) 3.4.7 Color Stability (ISO 188/ASTM D 573, 168 h at 80 +/- 2 C) After exposure the material shall not exhibit color change in exces
10、s of AATCC Rating 4 (AATCC Gray Scale for Evalua- ting Change in Color, 10 step). In addition there shall be not be any staining, spewing, loss of gloss. 3.4.8 Ozon Resistance Rating 0 (FLTM BP 101-1) 3.4.9 Heat Aging Performance (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 1000 h at 60 +/- 2 C. U
11、naged property values shall be determined at the time of the aged properties determination) 3.4.9.1 Tensile Strength Change +/- 25 % (Test Method per para 3.4.4) 3.4.9.2 Elongation Change +/- 25 % (Test Method per para 3.4.4) 3.4.9.3 Weight Change, max 10 % (50 x 25 x 2 +/- 0.2 mm specimen) 3.4.10 H
12、2S Staining Rating 5 (FLTM AN 102-1) ENGINEERING MATERIAL SPECIFICATION WSK-M4D661-A WP 3948-b Page 3 of 4 3.4.11 Paint Staining (FLTM BP 153-1, Procedure A, 25 x 50 x 2.0 +/- 0.2 mm specimen) No visible stain or change in surface appearance produced on the painted panel beyond the boundries of the
13、test specimen. Note: The raised welting of the painted surfaces in direct contact with the test specimen resulting from this test method is characteristic of plasticized vinyl compounds and shall not be cause for rejection. 3.5 WEATHERING RESISTANCE After exposure in accordance with 3.5.1, 3.5.2, 3.
14、5.3, and 3.5.4 the material shall show no color change in excess of specified AATCC rating (AATCC Gray Scale for Evaluating Change in Color, 10 step). In addition, there shall be no cracking, crazing or other deterio- ration. Specimen bent around 25 mm diameter mandrel shall not show any cracks when
15、 examined in bent conditon. Material shall not exhibit mildew growth and shall not exhibit mildew growth and/or staining after exposure according to 3.5.3. A slight loss of gloss or chalking will be allowed provided an acceptable appearance can be achieved by washing with mild de- tergents and water
16、 (ratio 5:95 by volume). 3.5.1 1600 h Weatherometer Rating 4 (FLTM BO 101-1, specimen size: 150 x 100 mm minimum, 2.0 +/- 0.2 mm thick, molded in smooth ungrained mold) 3.5.2 Xenon Arc Weatherometer Rating tbd (FLTM BO 101-3, tbd kJ/m2 exposure minimum, specimen size: 150 x 100 mm minimum, 2.0 +/- 0
17、.2 mm thick, molded in smooth polished mold) 3.5.3 12 months Florida Rating 4 (FLTM BI 160-1, 5 deg south, direct weathering inland, specimen size: 150 x 100 mm minimum, 2.0 +/- 0.2 mm thick, molded in smooth polished mold) 3.5.4 24 months Florida Rating tbd (FLTM BI 160-1, 5 deg south, direct weath
18、ering inland, specimen size: 150 x 100 mm minimum, 2.0 +/- 0.2 mm thick, molded in smooth polished mold) ENGINEERING MATERIAL SPECIFICATION WSK-M4D661-A WP 3948-b Page 4 of 4 3.6 ADDITIONAL REQUIREMENTS Specific requirements for material and/or manufactured parts shall be specified on the Engineerin
19、g drawing, Engineering parts specification and/or performance specifications. All critical areas with respect to these properties shall be clearly designated on the Engineering drawing. 3.7 SUPPLIERS RESPONSIBILITY All materials supplied to this specification must be equivalent in all characteristic
20、s to the material upon which approval was originally granted. Prior to making any change in the properties, composition, construction, color, processing or labelling of the material originally approved under this specification, whether or not such changes affect the materials ability to meet the spe
21、cification requirements, the Supplier shall notify Purchasing, Toxicology and the affected Materials Engineering activity of the proposed changes and obtain the written approval of the Materials Engineering activity. Test data, test samples and a new code identification are to be submitted with the
22、request. Substance restrictions imposed by law, regulations or Ford, apply to the materials addressed by this document. The restrictions are defined in Engineering Material Specification WSS-M99P9999-A1, unless a different suffix (e.g., A2 or A3) is specified on the engineering document for the appl
23、ication. 4. APPROVAL OF MATERIALS Materials defined by this specification must have prior approval by the responsible Materials Engineering activity. Suppliers desiring approval of their materials shall first obtain an expression of interest from the affected Purchasing, Design and Materials Enginee
24、ring activity. Upon request, the Supplier shall submit to the affected Materials Engineering activity its own laboratory report to the specification (test results, not nominal values), the material designation and code number, and test specimens for Ford evaluation. Upon approval, the material will be added to the Engineering Material Approved Source List.
