1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 02 2012 01 26 N Status No replacement named. A. Pan, APA 2005 11 30 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.8, 3.9 & 4 1989 11 17 Released SM/EQ9859 TP M. Siewert Controlled document at www.MATS Copyright 2012, Ford Global Technolo
2、gies, LLC Page 1 of 4 ACETAL (POM) COPOLYMER, MINERAL OIL WSK-M4D702-A IMPREGNATED MOLDING COMPOUND NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a mineral oil impregnated thermoplastic acetal copolymer based on trioxane. 2. APPLICATION This specification was r
3、eleased originally for material used for the door lock cylinder. 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 Melt Flow
4、 Rate 12 - 25 g/10 minutes (ISO 1133/ASTM D 1238, 190 C, 2.16 kg, 1.16 - 1.20 mm die) 3.4.2 Mineral Oil Content 3 - 6% (FLTM AP 150-04, use pellet shavings as test material, trichloroethane solvent) 3.5 MOLDED TEST SPECIMEN 3.5.1 Preparation of Test Specimens Unless otherwise specified all tests sha
5、ll 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/or B. The
6、 specimens shall be prepared according to ISO 294. No annealing allowed. 3.5.2 Density 1.35 - 1.41 g/cm3 (ISO 1183, Method A/ASTM D 792, Method A1) ENGINEERING MATERIAL SPECIFICATION WSK-M4D702-A Copyright 2012, Ford Global Technologies, LLC Page 2 of 4 3.5.3 Tensile Strength at Yield, min 42 MPa (I
7、SO 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 15% (Test Method according to para 3.5.3) 3.5.4 Flexural Modulus, min 1.8 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.
8、5.5 Shear Modulus at 23 C 615 - 920 MPa (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 cut from the center of specimen A. Specimen length between clamps 35-40 mm. Soak time at each temperature interval - 3 mi
9、nutes 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 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
10、.0 +/- 0.1 mm specimen, 10 specimens for each test) 3.5.6.1 At 23 +/- 2 C 3.0 kJ/m2 3.5.6.2 At -40 +/- 2 C 3.0 kJ/m2 The 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 po
11、ssible, 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) 3.5.7.1 At 1.82 MPa 75 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.
12、After 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 +/- 25% (Test Method per para 3.5.3) ENGINEERING MATERIAL SPECIFICATI
13、ON WSK-M4D702-A Copyright 2012, Ford Global Technologies, LLC Page 3 of 4 3.5.8.2 Impact Strength, Izod Change, max -40% (Test Method per para 3.5.6.1, specimens to be notched before heat aging) 3.6 FLAMMABILITY (ISO 3795) Burn Rate, max 100 mm/minute The specimen size required for material approval
14、 is 355 x 100 x 1.6 +/- 0.1 mm with a smooth surface. 3.7 FOGGING (FLTM BO 116-03, specimen thickness 1.5 - 1.7 mm) Fog Number, min 70 Formation of excessive amounts of clear film or droplets is cause for rejection. 5. GENERAL INFORMATION The information given below is provided for clarification and
15、 assistance in meeting the requirements of this specification. 5.1 COEFFICIENT OF LINEAR THERMAL EXPANSION 9 11-5/ 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 1.7 - 2.2% 5.2.2 Post Shrinka
16、ge (Separate specimens required for each test) After 48 h at 80 C 0.1 - 0.4% After 30 minutes at 120 C 0.1 - 0.6% 5.3 WATER ABSORPTION 0.3 - 0.6% (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 - 80 (ISO 868/ASTM D 2240) 5.5 DIMENSIONAL STABILITY The phrase “anneal after molding“ shall appear on engineering drawings when dimensional stability and/or improved frictional characteristics are engineering requirements. ENGINEERING MATERIAL SPECIFICATION WSK-M4D702-A Copyright 2012, Ford Global Technologies, LLC Page 4 of 4
