1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 02 2011 07 27 N Status No replacement named R. Harris, NA 2006 01 12 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.9, 3.10 & 4 1990 03 01 Released C/01031533 M. Siewert Printed copies are uncontrolled Copyright 2011, Ford Global Technolo
2、gies, LLC Page 1 of 5 ACETAL (POM) HOMOPOLYMER, UV STABILIZED WSK-M4D744-A MOLDING COMPOUND, INTERIOR NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a UV stabilized acetal homopolymer based on formaldehyde for interior use. 2. APPLICATION This specification was
3、released originally for material used for interior functional automotive applications. 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 CO
4、MPOUND 3.4.1 Melt Flow Rate 11 - 16 g/ (ISO 1133/ASTM D 1238, 190 C, 2.16 kg) 10 minutes 3.5 MOLDED TEST SPECIMEN 3.5.1 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.
5、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 according to ISO 294. No annealing allowed. 3.5.2 Density 1.39 - 1.44 g/cm3 (ISO
6、1183, Method A/ASTM D 792, Method A1) 3.5.3 Tensile Strength at Yield, min 59 MPa (ISO R 527/ASTM D 638M, 150 min x 10 x 4.0 +/- 0.2 mm specimen, 50 mm/minute test speed) ENGINEERING MATERIAL SPECIFICATION WSK-M4D744-A Printed copies are uncontrolled Copyright 2011, Ford Global Technologies, LLC Pag
7、e 2 of 5 3.5.3.1 Elongation at Break, min 10% (Test Method according to para 3.5.3) 3.5.4 Flexural Modulus, min 2.5 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 0.82 - 1.23 GPa (ASTM D 4065, forced constant amplit
8、ude, 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). Additionally, a Shear Modulus vs. Temperature curve shall be
9、 plotted for -50 to +150 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, 63.5 x 10 x 4.0 +/- 0.1 mm specimen, 10 specimens for each test) 3.5.6.1 At 23 +/- 2 C 4
10、4 kJ/m2 3.5.6.2 At -40 +/- 2 C 3.0 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 conducted outside, but within 5 s. 3.5.7 Heat Deflectio
11、n 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 80 C 3.5.7.2 At 0.45 MPa 143 C 3.5.8 Heat Aging Performance (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 1000 h at 110 +/- 2 C. After heat aging test specimens are to be conditioned in a desiccator for 3
12、 - 5 h at 23 +/- 2 C. Unaged property values shall be determined at the time of the aged properties determination). ENGINEERING MATERIAL SPECIFICATION WSK-M4D744-A Printed copies are uncontrolled Copyright 2011, Ford Global Technologies, LLC Page 3 of 5 3.5.8 1 Tensile Strength at Yield Change +/- 2
13、0% (Test Method per para 3.5.3) 3.5.8.2 Impact Strength, Izod Change, max +/- 30% (Test Method per para 3.5.6.1, specimens to 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 1.0 +/- 0.1 mm with a s
14、mooth surface. 3.7 FOGGING (FLTM BO 116-03) Fog Number, min 70 Formation of excessive amounts of clear film or droplets is cause for rejection. 3.8 WEATHERING RESISTANCE After exposure in accordance with 3.8.1 and 3.8.2, the material shall show no color change in excess of specified AATCC rating (AA
15、TCC Gray Scale for Evaluating Change in Color, 10 step). In addition, there shall be no cracking, crazing or other deterioration. 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). 3.8
16、1 Xenon Arc Weatherometer Rating 4-5 (SAE J1885, 313.5 kJ/m2 exposure minimum, specimen size: 150 x 100 mm minimum, 3.2 +/- 0.2 mm thick, molded in smooth polished mold) 3.8.2 12 months Florida Rating 4-5 (FLTM BI 160-01, 5 south, under glass, specimen size: 150 x 100 mm, minimum, 3.2 +/- 0.2 mm th
17、ick, molded in smooth polished mold) 5. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 COEFFICIENT OF LINEAR THERMAL EXPANSION 10 11-5/ C (ASTM D 696) ENGINEERING MATERIAL SPECIFICATION WSK-M4D744-A
18、Printed copies are uncontrolled Copyright 2011, Ford Global Technologies, LLC Page 4 of 5 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 1.7 - 2.2% 5.2.2 Post Shrinkage (Separate specimens required for each
19、 test) After 48 h at 80 C 0.17 - 0.22% After 30 minutes at 120 C 0.13 - 0.22% 5.3 WATER ABSORPTION 0.20 - 0.35% (ISO 62, 24 h/ASTM D 570, 24 h, 50 +/- 1 mm diameter, 3.1 +/- 0.1 mm thick specimen) 5.4 HARDNESS, DUROMETER D 82 - 85 (ISO 868/ASTM D 2240) 5.5 DIMENSIONAL STABILITY The phrase “anneal after molding“ shall appear on engineering drawings when dimensional stability and/or improved frictional characteristics are engineering requirements. ENGINEERING MATERIAL SPECIFICATION WSK-M4D744-A Printed copies are uncontrolled Copyright 2011, Ford Global Technologies, LLC Page 5 of 5
