1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 03 2013 07 03 Revised Revised title and para 3.4.1 G. Kowalski, NA 2005 09 23 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.8, 3.9 & 4 1989 03 01 Released SM/EQ2762 TP M. Siewert Controlled document at www.MATS Copyright 2013, Ford Globa
2、l Technologies, LLC Page 1 of 8 ACETAL (POM) HOMOPOLYMER, MELT FLOW WSK-M4D637-A1 RATE 1 4 ACETAL (POM) HOMOPOLYMER, MELT FLOW WSK-M4D637-A2 RATE 11 - 17 ACETAL (POM) HOMOPOLYMER, MELT FLOW WSK-M4D637-A3 RATE 19 - 32 ACETAL (POM) HOMOPOLYMER, MELT FLOW WSK-M4D637-A4 RATE 34 - 44 1. SCOPE The materia
3、l defined by these specifications is a thermoplastic acetal homopolymer based on formaldehyde with melt flow rates from 1 to 44 g/10 minutes. 2. APPLICATION These specifications were released originally for materials used for functional automotive applications. 3. REQUIREMENTS 3.0 STANDARD REQUIREME
4、NTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.1.1 All requirements of this specification, identified by symbol (s), shall be met with data representing 3 sigma values. 3.4 MOLDING COM
5、POUND (s) 3.4.1 Melt Flow Rate, g/10 minutes (ISO 1133, 190 C, 2.16 kg) A1 A2 A3 A4 1 4 11 - 17 19 - 32 34 - 44 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. ENGINEERING MATERIA
6、L SPECIFICATION WSK-M4D637-A1/A2/A3/A4 Copyright 2013, Ford Global Technologies, LLC Page 2 of 8 The following dimensions are required: A. 150 min x 10 x 4.0 +/- 0.2 mm (Tensile Bar, ISO 3167) B. 120 x 10 4.0 +/- 0.2 mm Specimens with shorter dimensions shall be cut from the center portion of the te
7、st 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 (ISO 1183, Method A) g/cm3 (s) 3.5.3 Tensile Strength at Yield, min 62 MPa (ISO R 527, 150 min x 10 x 4.0 +/- 0.2 mm specimen, 50 mm/minute test speed) (s) 3.5.3.1 Elongation
8、 at Break, %, min (Test Method according to para 3.5.3) A1 A2 A3 A4 25 10 10 5 (s) 3.5.4 Flexural Modulus, GPa, min (ISO 178, 80 x 10 x 4.0 +/- 0.2 mm specimen, 2 mm/minute test speed 64 mm support span) A1 A2 A3 A4 2.5 2.6 2.6 3.0 3.5.5 Shear Modulus at 23 C, GPa (ASTM D 4065, forced constant ampli
9、tude, fixed frequency of 1 Hz +/- 15%, strain level below 1%. Specimen approximately 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 min) Additionally, a Shear Modulus vs. Temperature curve shal
10、l be plotted for -50 to +150 C temperature range, at 5 C min intervals. The plotted curves must be within tolerance ranges shown on pages 5 (-A1), 6 (-A2), 7 (-A3), and 8 (-A4). A1 A2 A3 A4 0.80 - 1.20 0.84 - 1.26 0.80 - 1.20 0.82 - 1.37 ENGINEERING MATERIAL SPECIFICATION WSK-M4D637-A1/A2/A3/A4 Copy
11、right 2013, Ford Global Technologies, LLC Page 3 of 8 (s) 3.5.6 Impact Strength, Izod, kJ/m2, min (ISO 180/1A, 80 x 10 x 4.0 +/- 0.2 mm specimen, 10 specimens for each test) 3.5.6.1 At 23 +/- 2 C A1 A2 A3 A4 7.0 5.5 4.5 4.5 3.5.6.2 At -40 +/- 2 C A1 A2 A3 A4 6.0 4.0 3.5 4.0 The test specimens must b
12、e conditioned for min of 6 h at the above specified temperature prior to impact test. Low temperature testing shall be done within the cold box. (s) 3.5.7 Heat Deflection Temperature, C, min (ISO 76, 120 x 10 x 4.0 +/- 0.2 mm specimen, 0.34 +/- 0.01 mm deflection) 3.5.7.1 At 1.80 MPa A1 A2 A3 A4 100
13、 100 100 92 3.5.7.2 At 0.45 MPa A1 A2 A3 A4 150 160 160 150 3.5.8 Heat Aging Performance (A1 - A4) (ISO 188, except 150 +/- 50 air changes/h, 1000 h at 120 +/- 2 C. Unaged property values shall be determined at the time of the aged properties determination) 3.5.8.1 Tensile Strength Change, % (Test M
14、ethod per para 3.5.3) A1 A2 A3 A4 +/- 20 +/- 20 +/- 20 +/- 20 3.5.8.2 Impact Strength, Izod Change, % +/- 60 (Test Method per para 3.5.6.1, specimens to be notched before heat aging) ENGINEERING MATERIAL SPECIFICATION WSK-M4D637-A1/A2/A3/A4 Copyright 2013, Ford Global Technologies, LLC Page 4 of 8 3
15、.6 FOGGING (SAE J1756, 3 h at 100 C heating, 21 C cooling plate, post test conditioning 1 h) Fog Number, min 80 Formation of clear film, droplets or crystals is cause for rejection. 3.7 FLAMMABILITY (ISO 3795) Burn Rate, max 100 mm/minute The specimen size required for material approval is 355 x 100
16、 x 1.0 +/- 0.1 mm with a smooth surface. 4. GENERAL INFORMATION The information given below is provided for clarification and assistance in meeting the requirements of these specifications. Contact for questions concerning Engineering Material Specifications. 4.1 COEFFICIENT OF LINEAR THERMAL EXPAN
17、SION 10 - 14-5/ C (ASTM E 228 or TM, temperature range -40 to 100 C) 4.2 MOLD SHRINKAGE (ISO 2577, approximately 150 x 100 x 3.2 +/- 0.2 mm injection molded specimen) 4.2.1 Molding Shrinkage . After 48 h at 23 +/- 2 C 1.7 - 2.2% 4.2.2 Post Shrinkage (Separate specimens required for each test) . Afte
18、r 48 h at 80 C 0.11 - 0.18% . After 30 minutes at 120 C 0.08 - 0.20% 4.3 WATER ABSORPTION 0.22 - 0.35% (ISO 62, 24 h, 50 +/- 1 mm diameter, 3.1 +/- 0.1 mm thick specimen) 4.4 HARDNESS, DUROMETER D 82 - 85 (ISO 868, 15 s dwell) 4.5 DIMENSIONAL STABILITY The phrase “anneal after molding” shall appear
19、on engineering drawings when dimensional stability and/or improved frictional characteristics are engineering requirements. 4.6 RECYCLING CODE ENGINEERING MATERIAL SPECIFICATION WSK-M4D637-A1/A2/A3/A4 Copyright 2013, Ford Global Technologies, LLC Page 5 of 8 POM 5. SUMMARY OF REVISIONS 2013 07 03 Ch
20、anged MRF from 1-3 to 1-4. ENGINEERING MATERIAL SPECIFICATION WSK-M4D637-A1/A2/A3/A4 Copyright 2013, Ford Global Technologies, LLC Page 6 of 8 ENGINEERING MATERIAL SPECIFICATION WSK-M4D637-A1/A2/A3/A4 Copyright 2013, Ford Global Technologies, LLC Page 7 of 8 ENGINEERING MATERIAL SPECIFICATION WSK-M4D637-A1/A2/A3/A4 Copyright 2013, Ford Global Technologies, LLC Page 8 of 8 ENGINEERING MATERIAL SPECIFICATION WSK-M4D637-A1/A2/A3/A4 Copyright 2013, Ford Global Technologies, LLC Page 9 of 8
