1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2005 09 28 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.8, 3.9 Corrected numbering in 5.5 1994 07 15 Released EP00E10424747000 L. Rodigas Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 1 of 4 ACETAL (POM)
2、HOMOPOLYMER, CHEMICALLY WSK-M4D637-A5 LUBRICATED MOLDING COMPOUND 1. SCOPE The material defined by this specification is a thermoplastic acetal homopolymer based on formaldehyde, modified to achieve good lubricating properties. 2. APPLICATION This specification was released originally for material u
3、sed for functional automotive applications where a good sliding quality is required. 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). 3.1.1 All requir
4、ements of this specification, identified by symbol (s), shall be met with data representing 3 sigma values. 3.4 MOLDING COMPOUND (s) 3.4.1 Melt Flow Rate Range 9 - 18 g/ (ISO 1133, 190 C, 2.16 kg) 10 minutes 3.5 MOLDED TEST SPECIMEN 3.5.1 Preparation of Test Specimens Unless otherwise specified all
5、tests shall be carried out on injection 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/
6、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 1183, Method A) ENGINEERING MATERIAL SPECIFICATIONWSK-M4D637-A5Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 2 of 4 (s) 3.5.3 Tensile Strength at
7、 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 at Yield, min 15% (Test Method according to para 3.5.3) (s) 3.5.4 Flexural Modulus, min 2.6 GPa (ISO 178, 80 x 10 x 4.0 +/- 0.2 mm specimen, 2 mm/minute test speed, 64 mm support sp
8、an) 3.5.5 Shear Modulus at 23 C 0.91 - 1.40 GPa (ASTM D 4065, forced constant amplitude, 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
9、 interval - 3 minutes min) Additionally, a Shear Modulus versus Temperature curve shall be plotted for -50 to +150 C temperature range, at 5 C min intervals. The plotted curves must be within tolerance ranges shown on page 4. (s) 3.5.6 Impact Strength, Izod, min (ISO 180/1A, 80 x 10 x 4.0 +/- 0.2 mm
10、 specimen, 10 specimens for each test) 3.5.6.1 At 23 +/- 2 C 5.0 kJ/m23.5.6.2 At -40 +/- 2 C 4.0 kJ/m2The test specimens must be 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 Te
11、mperature, min (ISO 75, 120 x 10 x 4.0 +/- 0.2 mm specimen, 0.32 +/- 0.01 mm deflection) 3.5.7.1 At 1.80 MPa 94 C 3.5.7.2 At 0.45 MPa 155 C 3.5.8 Heat Aging Performance (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 age
12、d properties determination) 3.5.8.1 Tensile Strength at Yield, Change +/- 20% (Test Method per para 3.5.3) ENGINEERING MATERIAL SPECIFICATIONWSK-M4D637-A5Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 3 of 4 3.5.8.2 Impact Strength, Izod Change +/- 20% (Test Metho
13、d per para 3.5.6.1, specimens to be notched before heat aging) 3.6 FOGGING (FLTM BO 116-03, 3 h at 100 C) Fog Number, min 50 Formation of a 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 approv
14、al is 355 x 100 x 1.0 +/- 0.1 mm with a smooth surface. 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 11 - 13-5/ C (ASTM E 228 or TMA, temperature range -4
15、0 to 100 C) 5.2 MOLD SHRINKAGE (ISO 2577, approximately 150 x 100 x 3.2 +/- 0.2 mm injection molded specimen) 5.2.1 Molding Shrinkage . After 48 h at 23 +/- 2 C 1.6 - 2.1% 5.2.2 Post Shrinkage (Separate specimens required for each test) . After 48 h at 80 C 0.1 - 0.2% . After 30 minutes at 120 C 0.0
16、5 - 0.3% 5.3 HARDNESS, DUROMETER D 80 - 85 (ISO 868, 15 s dwell) 5.4 WATER ABSORPTION 0.2 - 0.4% (ISO 62, 24 h immersion, 50 +/- 1 mm diameter, 3.2 +/- 0.2 mm thick specimen) 5.5 RECYCLING CODE POM ENGINEERING MATERIAL SPECIFICATIONWSK-M4D637-A5Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 4 of 4
