1、c-2 ENGINEERING MATERIAL SPECIFICATION Date Release No. ReleaseDevis ion I I T #T.M. A. Myers File Control No. Specificatim lunber Material U- ACRYLIC (PMMA) MOLDING COMPOUND MEDIUM IMPACT RESISTANT, EXTERIOR, OPTICAL GRADE 1. SCOPE The material defined by this specification is a thermoplastic, rubb
2、er modified acrylic molding compound based on polymethylmethacrylate (PAW) resin characterized by higher impact strength then unmodified acrylic. 2. APPLICATION This specification was released originally for material used in 1991 Crown Victoria/Grand Marquis tail lamp lenses. 3. REQUIREMENTS 3.1 STA
3、TISTICAL 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 fin
4、al product is continuously reduced. INFRAFZD 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. 3.2 3.3 CONDITIONING PND TEST CONDITIONS All test values indicated herein are ba
6、sed on material conditioned in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5 3 relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. 3.4 MOLDING COMPOUND 3.4.1 . Melt Flow Rate (IS0 1133/ASTM D 1238, 230 C, 3.8 kg) 2.6 - 3.8 g
7、/10 minutes WSB-M4D687-A 4 I- ENGINEERING MATERIAL SPECIFICATION 3.5 MOLDED TEST SPECIMEN 3.5.1 3.5.2 3.5.3 3.5.4 3.5.5 Preparation of Test Specimens Unless otherwise specified all tests shall be carried out on injection molded one-end gated test specimens. The following dimensions are required: A.
8、150 minx 10 x 4.0 +/- 0.2 mm (Tensile Bar, IS0 3167) B. 120 x 10 x 4.0 +/- 0.2 mm Specimens with shorter dimensions shall be cut from the center portion of the test specimen A and/or B. The specimens shall be prepared according to IS0 294. No annealing allowed. Density 1.17 - 1.19 g/cm3 (IS0 1183, M
9、ethod A/ASTM D 792, Method Al) Tensile Strength at Yield, min (IS0 R 527/ASTM D 638M, 150 min x 10 x 4.0 +/- 0.2 mm specimen, 50 mm/min test speed) 3.5.3.1 Elongation at Break, min (Test Method according to para 3.5.3) Flexural Modulus; rain (IS0 178/ASTM D 790M, Method I, Procedure A, 80 x 10 x 4.0
10、 +/- 0.2 mm specimen, 64 mm support span) Shear Modulus at 23 C (ASTM D 4065. forced constant amplitude, fixed frequency of 1 Hz +/- 15 %, strain level below 1 %. Specimen approx. 60 x 10 x 4.0 +/- 0.2 mm cut from the center of specimen A. Specimen length between clamps 35-40 mm. Soak time at each t
11、emperature interval - 3 minutes minimum) 45 MPa 3.0 % 2.1 GPa 800 - 1200 MPa Additionally, a Shear Modulus vs . Temperature cume shall be plotted for - 50 to + 120 C temperature range, at 5 C minimum intervals. The plotted curve must be within tolerance range shown on page 6. WSB-M4D687-A c-2 ENGINE
12、ERING MATERIAL SPECIFICATION 3.5.6 Impact Strength, Izod, min (IS0 180, Method A/ASTM D 256, Method A, 63.5 x 10 x 4.0 +/- 0.2 mm specimen, 10 specimens for each test) 3.5.6.1 At 23 +/- 2 C 2.7 U/m2 3.5.6.2 At - 40 +/- 2 C tbd kJ/m2 3.5.6.3 At 0 +/- 2 G 1.6 W/m2 The test specimens must be conditione
13、d for minimum of 6 h at the above specified temperature prior to impact test. Low temperature testing shall be done within the cold box, if not possible, test can be conducted outside, but within 5 s. 3.5.7 Heat Deflection Temperature, min (IS0 75/ASTM D 648, 120 x 10 x 4.0 +/- 0.2 mm specimen) 3.5.
14、7.1 At 1.82 MPa 3.5.7.2 At 0.45 MPa 3.5.8 Vicat Softening Temperature, min (IS0 306, Method B, 10 x 10 x 4.0 +/- 0.2 IUD specimens. Bath - silicone oil, temp. raise 50 +/- 5 C/h. 68 C 75 c 85 C All specimens dry as molded. If not tested immediately after molding, specimens must be stored in a sealed
15、, moisture-proof container filled with silica gel. 3.5.9 Heat Aging Performance (IS0 188/ASTH D 573, 150 +/- 50 air changesfi, 1000 h at 70 +/- 2 C. Unaged property values shall be determined at the time of the aged properties determination) 3.5.9.1 Tensile Strength Change +/- 2s % (Test Method per
16、para 3.5.3) 3.5.9.2 Impact Strength, Izod Change +/- 25 % (Test Method per para 3.5.6.1, specimens to be notched before heat aging) Page 3 d 6 WSB-M4D687-A c- ENGINEERING MATERIAL SPECIFICATION 3.6 3.7 3.8 3.9 3.5.10 Optical Properties 3.5.10.1 Luminous Transmittance, min 90 % thick, clear, molded s
17、heet) (ASTM D 1003, 3.2 +/- 0.2 = 3.5.10.2 Haze, max 3% (ASTM I) 1003, 3.2 +/- 0.2 thick, clear, molded sheet) FLAMMABILITY (IS0 3795) Burn Rate, max 100 =/minute The specimen size required for.materia1 approval is 355 x 100 x tbd +/- 0.1 mm with a smooth surface. WEATHERING RESISTANCE The material
18、must withstand an outdoor exposure in accordance with SAE 3576, certified by an approved test laboratory. ADDITIONAL REQUIREMENTS Specific requirements for material and/or manufactured parts shall be specified on the Engineering drawing, Engineering parts specification and/or performance specificati
19、ons. All critical areas with respect to these properties shall be clearly designated on the Engineering drawing. SUPPLIERS RESPONSIBILITY All materials supplied to this specification must be equivalent in all characteristics to the material upon which approval was originally granted. Prior to making
20、 any change in the properties, composition, construction, color, processing or labeling of the material originally approved under this specification, whether or not such changes affect the materials ability to meet the specification requirements, the Supplier shall notify Purchasing, Toxicology and
21、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 request. Substance restrictions imposed by law, regulations or Ford, apply to
22、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 application. rn 9009360 0005442 490 rn Page 4 of 6 WSB-M4D687-A ENGINEERING MATERI
23、AL SPECIFICATION 4. 5. 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 Materi
24、als Engineering 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 ma
25、terial will be added to the Engineering Material Approved Source List. GENERAL INFORMATION The information below is provided for clarification and assistance in meeting the requirements to the specification. 5.1 COEFFICIENT OF LINEAR THERMAL EXPANSION 6 - 12E-5/ C (ASTM D 696) 5.2 MOLD SHRINKAGE (IS0 2577, approx. 150 x 100 x 3.2 +/- 0.2 mm - injection molded specimen) 5.2.1 Molding Shrinkage After 48 h at 23 +/- 2 C 0.2 - 0.8 % Page 5 of 6 9009160 0005443 327 = ENGINEERING MATERIAL SPECIFICATION WSBeM4D687-A SHEAR MODULUS HPa) 3948-bft?y Page 6 of 6 9009360 0005LlLt4 263 =
