1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2010 01 25 N-STATUS No replacement named J. Crist, NA 2006 05 19 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.8, 3.9 & 4 1992 10 01 Released EP00E10176308000 L. Rodigas Printed copies are uncontrolled Copyright 2010, Ford Global Technologies
2、 LLC Page 1 of 5 ACETAL (POM) COPOLYMER, MOLYBDENUM WSK-M4D852-A DISULPHIDE FILLED MOLDING COMPOUND NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a molybdenum disulphide (MoS2) filled acetal copolymer based on trioxane. 2. APPLICATION This specification was re
3、leased originally for material used for functional automotive applications such as transmission selector control, main pivot bushing, etc. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For P
4、roduction Materials (WSS-M99P1111-A). 3.4 MOLDING COMPOUND 3.4.1 Melt Flow Rate 8 - 12 g/ (ISO 1133/ASTM D 1238, 10 minutes 190 C, 2.16 kg) 3.4.2 Filler Content 0.85 - 1.05% (ISO 3451/1, Method A, molybdenum disulphide filler,1 h at 600 +/- 25 C, test portion E - 1 to 2 g) Calculate % filler: A x 1.
5、112 x 100 E A = Ash in grams E = Test portion in grams 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 4.0 +/- 0.2 mm (Ten
6、sile Bar, ISO 3167) B. 120 x 10 x 4.0 +/- 0.2 mm ENGINEERING MATERIAL SPECIFICATIONWSK-M4D852-APrinted copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 2 of 5 Specimens with shorter dimensions shall be cut from the center portion of the test specimen A and/or B. The specime
7、ns shall be prepared according to ISO 294. No annealing allowed. 3.5.2 Density 1.40 - 1.44 g/cm (ISO 1183, Method A/ASTM D 792, Method A1) 3.5.3 Tensile Strength at Yield, min 60 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,
8、 min 7% (Test Method according to para 3.5.3) 3.5.4 Flexural Modulus, min 2.2 GPa (ISO 178/ASTM D 790M, Method I, specimen, 2 mm/minute 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 0.80 - 1.35 GPa (ASTM
9、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 minutes minimum) Additionally, a Shear Modulus vs.
10、Temperature curve shall be plotted for -50 to +160 C temperature range, at 5 C minimum intervals. The plotted curve must be within tolerance ranges shown on page 5. 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
11、) 3.5.6.1 At 23 +/- 2 C 4.0 kJ/m3.5.6.2 At -40 +/- 2 C 3.0 kJ/m 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 possible, test can be conducted outside, but within 5 s
12、 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 1.80 MPa 93 C 3.5.7.2 At 0.45 MPa 150 C ENGINEERING MATERIAL SPECIFICATIONWSK-M4D852-APrinted copies are uncontrolled Copyright 2010, Ford Global Te
13、chnologies, LLC Page 3 of 5 3.5.8 Heat Aging Performance (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 1000 h at 120 +/- 2 C. 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 propertie
14、s determination) 3.5.8 1 Tensile Strength at Break Change +/- 20% (Test Method per para 3.5.3) 3.5.8.2 Impact Strength, Izod Change, max +/- 35% (Test Method per para 3.5.6.1, specimens to be notched before heat aging) 3.6 FOGGING (FLTM BO 116-03) Fog Number, min 80 The formation of droplets or coal
15、escence into a clear film 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 assist
16、ance in meeting the requirements of this specification. 5.1 COEFFICIENT OF LINEAR THERMAL EXPANSION 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 2.0 - 2.5% 5.2.2 Post Shrinkage (Sep
17、arate specimens required for each test) . After 48 h at 80 C 0.10 - 0.30% . After 30 minutes at 120 C 0.10 - 0.40% ENGINEERING MATERIAL SPECIFICATIONWSK-M4D852-APrinted copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 4 of 5 5.3 WATER ABSORPTION 0.20 - 0.30% (ISO 62, 24 h/A
18、STM D 570, 24 h, 50 +/- 1 mm diameter, 3.1 +/- 0.1 mm thick specimen) 5.4 DIMENSIONAL STABILITY The phrase “anneal after molding“ shall appear on engineering drawings when dimensional stability and/or improved frictional characteristics are engineering requirements. 5.5 RECYCLING CODE SAE or POM OPTIONAL POM ENGINEERING MATERIAL SPECIFICATIONWSK-M4D852-APrinted copies are uncontrolled Copyright 2010, Ford Global Technologies, LLC Page 5 of 5
