1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 03 2013 08 01 N Status Replaced by WSS-M4D776-B1 / B3 G. Eaton, NA 2009 07 28 Revised Updated 3.5.5 C. Herbert, SAO 1991 06 03 Released EP00E01089485000 P. Kuntze Copyright 2013, Ford Global Technologies, LLC Page 1 of 5 ACRYLIC (PMMA), H
2、EAT RESISTANT, OPTICAL GRADE WSK-M4D776-A2 MOLDING COMPOUND, EXTERIOR NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a thermoplastic acrylic molding compound based on polymethylmethacrylate (PMMA). 2. APPLICATION This specification was released originally for ma
3、terial used for lenses of front and rear lamps. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.4 MOLDING COMPOUND 3.4.1 Melt Flow Rate 1.7 - 5.0 g
4、/10 minutes (ISO 1133/ASTM D 1238 230 C, 3.8 kg) The material shall be dried for 2 h minimum at 95 - 100 C in a mechanical convection oven immediately preceding the test. 3.5 MOLDED TEST SPECIMEN 3.5.1 Preparation of Test Specimens Unless otherwise specified all tests shall be carried out on injecti
5、on molded one-end gated test specimens. The following dimensions are required: A. 150 min x 10 x 4.0 +/- 0.2 mm (Tensile Bar, ISO 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
6、 according to ISO 294. No annealing allowed. 3.5.2 Density 1.17 - 1.19 g/cm3 (ISO 1183, Method A/ASTM D 792, Method A1) 3.5.3 Tensile Strength at Max Load, min 78 MPa (ISO R 527/ASTM D 638M, 150 min x 10 x 4.0 +/- 0.2 mm specimen, 50 mm/min test speed) ENGINEERING MATERIAL SPECIFICATION WSK-M4D776-A
7、2 Copyright 2013, Ford Global Technologies, LLC Page 2 of 5 3.5.3.1 Elongation at Break, min 3.0% (Test Method according to para 3.5.3) 3.5.4 Flexural Modulus, min 3.1 GPa (ISO 178/ASTM D 790M, Method I, Procedure A, 80 x 10 x 4.0 +/- 0.2 mm specimen, 64 mm support span) 3.5.5 Shear Modulus at 23 C
8、1.1 - 1.8 GPa (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 temperature interval - 3 minutes minimum). Additional
9、ly, a Shear Modulus vs. Temperature curve 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 5. 3.5.6 Impact Strength, Izod, min (ISO 180, Method A/ASTM D 256, Method A, 80 x 10 x 4.0 +/- 0.2 mm specimen, 10
10、specimens for each test) 3.5.6.1 At 23 +/- 2 C 1.5 kJ/m2 3.5.6.2 At -40 +/- 2 C 1.5 kJ/m2 The test specimens must be conditioned 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 conduct
11、ed outside, but within 5 s. 3.5.7 Heat Deflection Temperature, min (ISO 75/ASTM D 648, 120 x 10 x 4.0 +/- 0.2 mm specimen) 3.5.7.1 At 1.82 MPa 97 C 3.5.7.2 At 0.45 MPa 105 C Conditioning Pre-treatment for 16 h at 80 C, followed by at least 1 h cooling at 23 C in the dessiccator. Testing shall be per
12、formed immediately after the samples are removed from the dessiccator. 3.5.8 Vicat Softening Temperature, min 106 C (ISO 306, 10 x 10 x 4.0 +/- 0.2 mm specimens. Bath - silicone oil, temp. raise 50 +/- 5 C/h. Dial gage reset to 0 after addition of 5 kg weight. At 49.0 N load) All specimens dry as mo
13、lded. If not tested immediately after molding, specimens must be stored in a sealed, moisture-proof container filled with silica gel. ENGINEERING MATERIAL SPECIFICATION WSK-M4D776-A2 Copyright 2013, Ford Global Technologies, LLC Page 3 of 5 3.5.9 Heat Aging Performance (ISO 188/ASTM D 573, 150 +/- 5
14、0 air changes/h, 1000 h at 90 +/- 2 C. Unaged property values shall be determined at the time of the aged properties determination) 3.5.9.1 Tensile Strength at Max Load Change +/- 15% (Test Method per para 3.5.3) 3.5.9.2 Impact Strength, Izod Change +/- 15% (Test Method per para 3.5.6.1, specimens t
15、o be notched before heat aging) 3.6 FLAMMABILITY (ISO 3795) Burn Rate, max 100 mm/minute The specimen size required for material approval is 355 x 100 x 1.1 +/- 0.1 mm with a smooth surface. 3.7 OPTICAL PROPERTIES 3.7.1 Luminous Transmittance, min 92% (ASTM D 1003, 3.2 +/- 0.2 mm thick, clear, molde
16、d sheet) 3.7.2 Haze, max 1% (ASTM D 1003, 3.2 +/- 0.2 mm thick, clear, molded sheet) 3.7.3 Yellowness Index, max 1.5 (ASTM D 1925, 3.2 +/- 0.2 mm thick, clear, molded sheet. Test to be performed after 1580 kJ/m2 exposure minimum according to SAE J1960) Before rating, the specimens are to be treated
17、with Ford car polish (auto wax) at permission of the affected Product Development Materials Activity. 3.8 WEATHERING RESISTANCE The material must withstand an outdoor exposure in accordance with SAE J576, certified by an approved test laboratory (ETL, AAMVA, etc.) 3.9 WEATHERING RESISTANCE (EAO only
18、) After exposure in accordance with 3.9.1 the material shall show no fading or 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 deterioration. ENGINEERING MATERIAL SPECIFICATION WSK-
19、M4D776-A2 Copyright 2013, Ford Global Technologies, LLC Page 4 of 5 A slight loss of gloss or chalking will be allowed provided an acceptable appearance can be achieved by washing with mild detergents and water (ratio 5:95 by volume). All initial approvals will be based on the preliminary Weatherome
20、ter exposure, pending outdoor exposure results for final approval. 3.9.1 Xenon Arc Weatherometer Rating 4 (SAE J1960, 1580 kJ/m2 exposure minimum, specimen size: 150 x 100 mm minimum, 3.2 +/- 0.2 mm thick, molded in smooth polished mold) 5. GENERAL INFORMATION The information given below is provided
21、 for clarification and assistance in meeting the requirements of this specification. 5.1 COEFFICIENT OF LINEAR THERMAL EXPANSION 7-5/C (ASTM D 696) 5.2 MOLD SHRINKAGE (ISO 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 0.35 - 0.7%
22、 5.2.2 Post Shrinkage (Separate specimens required for each test) After 48 h at 80 C 0.1% 5.3 MELT VOLUME RATE 1.65-4.90 cm3/10 minutes (ISO 1133/ASTM D 1238, 230 C, 3.8 kg) The material shall be dried for 2 h minimum at 95 - 100 C in a mechanical convection oven immediately preceding the test. ENGINEERING MATERIAL SPECIFICATION WSK-M4D776-A2 Copyright 2013, Ford Global Technologies, LLC Page 5 of 5
