1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2006 07 17 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.8, 3.9 & 4 1994 11 05 Released NB00I10043054382 M. Trapp Printed copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 1 of 5 ACETAL (POM) HOMOPOLYMER, 15% PTFE AND
2、 WSB-M4D912-A SILICONE LUBRICATED MOLDING COMPOUND 1. SCOPE The material defined by this specification is a thermoplastic acetal homopolymer molding compound based on trioxane modified with 13% PTFE and 2% silicone to produce a low coefficient of friction material. 2. APPLICATION This specification
3、was released originally for material used for functional automotive applications. 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 requireme
4、nts 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 13 g/10 minutes (ISO 1133, 190 C, 2.16 kg) The material shall be dried for 3 h minimum at 100 C in a mechanical convection oven immediately preceding
5、the test. (s) 3.4.2 Melt Temperature, min 176 C (ISO 3146, Method C, 10 C/min heating rate) 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:
6、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/or B. The specimens shall be prepared according to ISO 294. No annealing allowed. ENGINEERING MATERIAL SPECIFICATION
7、WSB-M4D912-APrinted copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 2 of 5 3.5.2 Density 1.43 - 1.49 g/cm (ISO 1183, Method A) (s) 3.5.3 Tensile Strength at Yield, min 45 MPa (ISO R 527, 150 minimum x 10 x 4.0 +/- 0.2 mm specimen, 50 mm/min test speed (s) 3.5.3.1 Elongatio
8、n at Break, min 11% (Unfilled only) (Test Method according to para 3.5.3) (s) 3.5.4 Flexural Modulus, min 2.3 GPa (ISO 178, 80 x 10 x 4.0 +/- 0.2 mm specimen, 2 mm/min test speed, 64 mm support span) 3.5.5 Shear Modulus at 23 C 848 - 1272 MPa (ASTM D 4065, forced constant amplitude, fixed frequency
9、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 versus Temperature curve shall be plotted for -50 to
10、 +160 C temperature range, at 5 C minimum intervals. The plotted curve must be within tolerance range shown on page 5. (s) 3.5.6 Impact Strength, Izod, 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 3.10 kJ/m 3.5.6.2 At -40 +/- 1 C 3.25 kJ/m The
11、 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. (s) 3.5.7 Heat Deflection Temperature, 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
12、.80 MPa 86 C 3.5.7.2 At 0.45 MPa 154 C ENGINEERING MATERIAL SPECIFICATIONWSB-M4D912-APrinted copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 3 of 5 All specimens dry as molded. If not tested immediately after molding, specimens must be stored in a sealed, moisture-proof co
13、ntainer filled with silica gel. 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 aged properties determination) 3.5.8.1 Tensile Strength at Yield Change +/- 25% (Test Method per para 3.5.3) 3.
14、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 FOGGING (FLTM BO 116-03, 3 h at 100 C, 21 C cooling plate) Fog Number, min 80 Formation of clear film, droplets or crystals is cause for rejection. 3.7 FLAMMABILITY (ISO 3795) Bur
15、n Rate, max 100 mm/minute The specimen size required for material approval is 355 x 100 x 2.0 +/- 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
16、 THERMAL EXPANSION 9.9-5/ C (ASTM E 831 (TMA), temperature range -30 to +30 C) 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 2.95% ENGINEERING MATERIAL SPECIFICATIONWSB-M4D912-APrinted copies are uncontr
17、olled Copyright 2006, Ford Global Technologies, LLC Page 4 of 5 5.2.2 Post Shrinkage (Separate specimens required for each test) . After 48 h at 80 C 0.00% . After 30 min at 120 C 0.03% (expansion) 5.3 WATER ABSORPTION 0.38% (ISO 62, 24 h immersion, 50 +/- 1 mm diameter, 3.2 +/- 0.2 mm thick specimen) 5.4 HARDNESS, DUROMETER D 77 (ISO 868, 15 s dwell) 5.5 RECYCLING CODE POM-(PTFE+Si)15 ENGINEERING MATERIAL SPECIFICATIONWSB-M4D912-APrinted copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 5 of 5
