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 03 02 Revised & Retyped Pages 1-5 EP00E10176262000 L. Rodigas 1989 11 17 Released SM/EQ9859 TP M. Siewert Printed copies are uncontrolled Copyright 2005, Ford Global Tec
2、hnologies, LLC Page 1 of 4 ACETAL (POM) HOMOPOLYMER, MODIFIED, HIGH WSK-M4D681-A IMPACT GRADE 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
3、used for the adjuster nut on the rear seat back power recline mechanism. 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 M
4、elt Flow Rate 1 - 3 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. 150 min x 10 x 4
5、.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 1.31 - 1.35 g/cm3(ISO 1183, Method A/AS
6、TM D 792, Method A1) 3.5.3 Tensile Strength at Yield, min 38 MPa (ISO R 527/ASTM D 638M, 150 min x 10 x 4.0 +/- 0.2 mm specimen, 50 mm/minute test speed) 3.5.3.1 Elongation at Break, min 100% (Test Method according to para 3.5.3) ENGINEERING MATERIAL SPECIFICATIONWSK-M4D681-APrinted copies are uncon
7、trolled Copyright 2005, Ford Global Technologies, LLC Page 2 of 4 3.5.4 Flexural Modulus, min 1.0 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 350 - 525 MPa (ASTM D 4065, forced constant amplitude, fixed frequency
8、 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 plotted for -50 to +
9、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, 63.5 x 10 x 4.0 +/- 0.1 mm specimen, 10 specimens for each test) 3.5.6.1 At 23 +/- 2 C 50 kJ/m23.5.6.2 At -20
10、 +/- 2 C 20 kJ/m23.5.6.3 At -40 +/- 2 C 8 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 within 5 s. 3.5.7 Heat Defl
11、ection 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 50 C 3.5.7.2 At 0.45 MPa 110 C 3.5.8 Heat Aging Performance (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 1000 h at 70 +/- 2 C. After heat aging test specimens are to be conditioned in a desiccator f
12、or 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 +/- 25% (Test Method per para 3.5.3) 3.5.8.2 Impact Strength, Izod Change, max -50% (Test Method per para 3.5.6.1, specimens to be notched
13、before heat aging) ENGINEERING MATERIAL SPECIFICATIONWSK-M4D681-APrinted 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 amounts of clear film or droplets is cause for rejection. 3.7 FLAMMABILITY
14、 (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 assistance in meeting the requirements of this specification. 5.1 COEFFI
15、CIENT OF LINEAR THERMAL EXPANSION 11.5 - 12.5-5/ 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 1.2 - 1.8% 5.2.2 Post Shrinkage (Separate specimens required for each test) . After 48 h at 8
16、0 C 0.1 - 0.25% . After 30 minutes at 120 C 0.1 - 0.30% 5.3 WATER ABSORPTION 0.3 - 0.5% (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 74 - 77 (ISO 868/ASTM D 2240) 5.5 DIMENSIONAL STABILITY The phrase “anneal after molding“ shall appea
17、r on engineering drawings when dimensional stability and/or improved frictional characteristics are engineering requirements. 5.6 RECYCLING CODE SAE or POM POM OPTIONAL ENGINEERING MATERIAL SPECIFICATIONWSK-M4D681-APrinted copies are uncontrolled Copyright 2005, Ford Global Technologies, LLC Page 4 of 4
