1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2005 11 15 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.8, 3.9 & 4 1992 04 01 Released EP00E10176266000 L. Rodigas Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 1 of 4 ACETAL (POM) HOMOPOLYMER, IMPACT MOD
2、IFIED WSK-M4D681-A2 MOLDING COMPOUND 1. SCOPE The material defined by this specification is a polyurethane modified thermoplastic acetal homopolymer based on formaldehyde. 2. APPLICATION This specification was released originally for material used for functional automotive applications. 3. REQUIREME
3、NTS 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 9 - 15 g/ (ISO 1133/ASTM D 1238, 190 C, 2.16 kg) 10 minutes 3.5 MOLDED
4、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. 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 sh
5、orter 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 1.37 - 1.41 g/cm3(ISO 1183, Method A/ASTM D 792, Method A1) 3.5.3 Tensile Strength at Yield, min 50 MPa (ISO R 527/ASTM D 6
6、38M, 150 min x 10 x 4.0 +/- 0.2 mm specimen, 50 mm/minute test speed) 3.5.3.1 Elongation at Break, min 30% (Test Method according to para 3.5.3) ENGINEERING MATERIAL SPECIFICATIONWSK-M4D681-A2Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 2 of 4 3.5.4 Flexural Mod
7、ulus, min 2.0 GPa (ISO 178/ASTM D 790M, Method I, Procedure A, 80 x 10 x 4.0 +/- 0.2 mm specimen, 2 mm/min test speed, 64 mm support span, the radius of the loading nose 5.0 +/- 0.1 mm and of the supports 2.0 +/- 0.2 mm) 3.5.5 Shear Modulus at 23 C 0.65 - 1.05 GPa (ASTM D 4065, forced constant ampli
8、tude, 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 4. 3.5.6 Impact Strength, Izod, min (ISO 180, Method A/ASTM D 256, Method A, 80 x 10 x 4.0 +/- 0.1 mm specimen, 10 specimens for each test) 3.5.6.1 At 23 +/- 2 C 8.0
10、 kJ/m23.5.6.2 At -20 +/- 2 C 7.0 kJ/m23.5.6.3 At -40 +/- 2 C 4.5 kJ/m2The 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 with
11、in 5 s. 3.5.7 Heat Deflection Temperature, min (ISO 75/ASTM D 648, 120 x 10 x 4.0 +/- 0.2 mm specimen, at standard deflection of 0.32 +/- 0.01 mm) 3.5.7.1 At 1.82 MPa 65 C 3.5.7.2 At 0.45 MPa 135 C 3.5.8 Heat Aging Performance (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 1000 h at 90 +/- 2 C. Afte
12、r heat aging test specimens are to be conditioned in a desiccator for 3 - 5 h at 23 +/- 2 C. Unaged property values shall be determined at the time of the aged properties determination) 3.5.8 1 Tensile Strength at Yield, Change +/- 20% (Test Method per para 3.5.3) 3.5.8.2 Impact Strength, Izod Chang
13、e, max -50% (Test Method per para 3.5.6.1, specimens to be notched before heat aging) ENGINEERING MATERIAL SPECIFICATIONWSK-M4D681-A2Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 3 of 4 3.6 FOGGING (FLTM BO 116-03) Fog Number, min 80 Formation of excessive amount
14、s of clear film or droplets 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 x 1.0 +/- 0.1 mm with a smooth surface. 5. GENERAL INFORMATION The information given below is provided for clarification and assi
15、stance in meeting the requirements of this specification. 5.1 COEFFICIENT OF LINEAR THERMAL EXPANSION 11 - 12-5/ 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 1.8 - 2.0% 5.2.2 Post Shrinka
16、ge (Separate specimens required for each test) . After 48 h at 80 C 0.25 - 0.25% . After 30 minutes at 120 C 0.50 - 0.60% 5.3 WATER ABSORPTION 0.2 - 0.4% (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 79 - 83 (ISO 868/ASTM D 2240) 5.5 D
17、IMENSIONAL STABILITY The phrase “anneal after molding“ shall appear on engineering drawings when dimensional stability and/or improved frictional characteristics are engineering requirements. 5.6 RECYCLING CODE SAE or POM OPTIONAL POM ENGINEERING MATERIAL SPECIFICATIONWSK-M4D681-A2Printed copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 4 of 4
