1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 02 2011 07 27 N Status No replacement named R. Harris, NA 2006 05 16 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.8, 3.9 Fixed Numbering 3.5.8 1992 11 21 Released NB00I10043054211 L. A. Graham Printed copies are uncontrolled Copyright 2
2、011, Ford Global Technologies, LLC Page 1 of 4 ACETAL (POM) COPOLYMER, 25% MINERAL FILLED WSB-M4D860-A MOLDING COMPOUND NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a thermoplastic acetal copolymer based on trioxane with 25% mineral (CaCO3) filler. 2. APPLICAT
3、ION This specification was released originally for material used for the spool component of the web-grabber retractor front seat belt assembly. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements
4、For Production Materials (WSS-M99P1111-A). 3.4 MOLDING COMPOUND 3.4.1 Melt Flow Rate 4 - 9 g/10 minutes (ISO 1133/ASTM D 1238, 190 C, 2.16 kg) 3.4.2 Filler Content 22 - 28% (ISO 3451/1, Method A, 600 C in nitrogen, percent CaC03 is calculated from percent ash) 3.5 MOLDED TEST SPECIMEN 3.5.1 Preparat
5、ion 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 shorter dimensions shall be cu
6、t 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 1.50 - 1.70 g/cm (ISO 1183, Method A/ASTM D 792, Method A1) ENGINEERING MATERIAL SPECIFICATION WSB-M4D860-A Printed copies are uncontrolled Copyright 2
7、011, Ford Global Technologies, LLC Page 2 of 4 3.5.3 Tensile Strength at Max Load, min 37 MPa (ISO R 527/ASTM D 638M, 150 min x 10 x 4.0 +/- 0.2 mm specimen, 5 mm/min test speed) 3.5.4 Flexural Modulus, min 3.0 GPa (ISO 178/ASTM D 790M, Method I, Procedure A, 80 x 10 x 4.0 +/- 0.2 mm specimen, 2 mm/
8、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 1.2 - 2.0 GPa (ASTM D 4065, forced constant amplitude, fixed frequency of 1 Hz +/- 15%, strain level below 1%. Specimen approx. 60 x 10 x 4.0 +/- 0.2 mm c
9、ut 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 +150 C temperature range, at 5 C minimum intervals. The plotted curve must be within
10、 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 +/- 0.2 mm specimen, 10 specimens for each test) 3.5.6.1 At 23 +/- 2 C 3.8 kJ/m 3.5.6.2 At -40 +/- 2 C 3.5 kJ/m The test specimens must be conditioned for minimum of 6 h at the a
11、bove 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 Deflection Temperature, min (ISO 75/ASTM D 648, 120 x 10 x 4.0 +/- 0.2 mm specimen, at standard deflection of 0.32 +/
12、 0.01 mm) 3.5.7.1 At 1.80 MPa 85 C 3.5.7.2 At 0.45 MPa 140 C 3.5.8 Heat Aging Performance (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 1000 h at 130 +/- 2 C. Unaged property values shall be determined at the time of the aged properties determination) ENGINEERING MATERIAL SPECIFICATION WSB-M4D860-
13、A Printed copies are uncontrolled Copyright 2011, Ford Global Technologies, LLC Page 3 of 4 3.5.8.1 Tensile Strength Change +/- 25% (Test Method per para 3.5.3) 3.5.8.2 Impact Strength, Izod Change +/- 25% (Test Method per para 3.5.6.1, specimens to be notched before heat aging) 3.6 FLAMMABILITY (IS
14、O 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. 3.7 FOGGING (FLTM BO 116-03, 3 h a5 100 C) Fog Number, min 85 Formation of excessive amounts of clear film or droplets is cause for rejection. 5. GENERAL INFORMA
15、TION The information given below is provided for clarification and assistance in meeting the requirements of this specification. 5.1 COEFFICIENT OF LINEAR THERMAL EXPANSION 2.5-5/ 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
16、 Shrinkage . After 48 h at 23 +/- 2 C 1.6% 5.2.2 Post Shrinkage (Separate specimens required for each test) . After 48 h at 80 C 0.1% . After 30 min at 120 C 0.1% 5.3 RECYCLING CODE POM-K25 ENGINEERING MATERIAL SPECIFICATION WSB-M4D860-A Printed copies are uncontrolled Copyright 2011, Ford Global Technologies, LLC Page 4 of 4
