1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Rev 03 2014 02 27 N Status Replaced by WSS-M4D648-B1 R. Harris, NA 2009 09 22 Revised See Summary of Revisions J. Souza, SA 1989 05 19 SM/EQ9548 TP Released M. Siewert Copyright 2014, Ford Global Technologies, LLC Page 1 of 4 POLYAMIDE (PA) 6
2、6, HEAT STABILIZED MOLDING WSK-M4D648-A COMPOUND NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a heat stabilized polyamide 66 molding compound. 2. APPLICATION This specification was released originally for material used for speedometer drive gears. NOTICE: This
3、 material absorbs and retains moisture. Part design and tolerances must accommodate changes in part dimensions and physical properties due to moisture absorption or loss in the service/assembly environment. 3. REQUIREMENTS Material specification requirements are to be used for initial qualification
4、of materials. 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). 3.3 CONDITIONING AND TEST CONDITIONS All test values indicated herein are based on material conditioned
5、 in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5% relative humidity for not less than 24 h prior to testing and tested under the same conditions unless otherwise specified. All test materials immediately after processing have to be sealed in containers that are impermeable to water vapor. If t
6、he moisture content exceeds 0.2%, condition the material for a minimum of 16 h at 40 - 50 C at a reduced pressure below 133 Pa. Conduct tests in a controlled atmosphere of 23 +/- 2 C and 50 +/- 5% relative humidity. Individual specimens shall not be removed from closed containers until immediately b
7、efore testing. 3.4 MOLDING COMPOUND 3.4.1 Melt Temperature 250 - 265 C (ISO 1218, Method B/ASTM D 789) ENGINEERING MATERIAL SPECIFICATION WSK-M4D648-A Copyright 2014, Ford Global Technologies, LLC Page 2 of 4 3.5 MOLDED TEST SPECIMEN 3.5.1 Preparation of Test Specimens Unless otherwise specified all
8、 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 cut from the center portion of the test specimen A and
9、/or B. The specimens shall be prepared according to ISO 294. No annealing allowed. 3.5.2 Density 1.12 - 1.16 g/cm3 (ISO 1183, Method A/ASTM D 792, Method A1) 3.5.3 Tensile Strength at Yield, min 70 MPa (ISO R 527/ASTM D 638M, 150 x 10 x 4.0 +/- 0.2 mm specimen, 50 mm/minute test speed) 3.5.4 Flexura
10、l Modulus, min 2.5 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 Impact Strength, Izod, min (ISO 180, Method A/ASTM D 256, Method A, 63.5 x 10 x 4.0 +/-0.2 mm specimen, 10 specimens for each test) 3.5.5.1 At 23 +/- 2 C 3.5 kJ/m2 3.5.5.2
11、 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 possible, test can be conducted outside, but within 5 s. ENGINEERING MATERIAL SPECIFICATION W
12、SK-M4D648-A Copyright 2014, Ford Global Technologies, LLC Page 3 of 4 3.5.6 Heat Deflection Temperature, min (ISO 75/ASTM D 648, 120 x 10 x 4.0 +/- 0.2 mm specimen) 3.5.6.1 At 1.82 MPa 65 C 3.5.6.2 At 0.45 MPa 210 C 3.5.7 Heat Aging Performance (ISO 188/ASTM D 573, 1000 h at 140 +/- 2 C. After heat
13、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) 3.5.7.1 Tensile Strength at Max Load Change +/- 25% (Test Method per para 3.5.3) 3.6 FLAMMABILITY (ISO 3795) Burn Rate, m
14、ax 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 COEFFICIENT OF LINEAR THERMAL
15、EXPANSION 7.8 - 8.8-5/ 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 - 2.0% 5.2.2 Post Shrinkage (Separate specimens required for each test) After 48 h at 80 C 0.1 - 0.3% After 30 minute
16、s at 120 C 0.2 - 0.5% 5.3 WATER ABSORPTION 1.2 - 1.5% (ISO 62, 24 h/ASTM D 570, 24 h, 50 +/- 1 mm diameter, 3.2 +/- 0.2 mm thick specimen) ENGINEERING MATERIAL SPECIFICATION WSK-M4D648-A Copyright 2014, Ford Global Technologies, LLC Page 4 of 4 5.4 IMPACT STRENGTH, IZOD, min (ISO 180, Method A/ASTM
17、D 256, Method A, 63.5 x 10 x 4.0 +/- 0.2 mm specimen, 10 specimens minimum) 5.4.1 After Moisture Conditioning 20 kJ/m2 The notched specimens shall be immersed for 48 h in distilled water at 50 +/- 1 C and subsequently conditioned for 1 h at 23 +/- 2 C and 50 +/- 5% relative humidity prior to test and tested under the same conditions within 1 h. 6. SUMMARY OF REVISIONS 2009 09 22 Removed - 3.5.5 - Shear Modulus at 23 C
