1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2006 01 11 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.8, 3.9 & 4 1991 02 01 Released EP00E01089481000 M. Siewert Printed copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 1 of 4 POLYAMIDE (PA) 12, RIGID, HEAT STABILIZED
2、 WSK-M4D739-A2 MOLDING COMPOUND 1. SCOPE The material defined by this specification is a rigid, heat stabilized polyamide 12 molding compound. 2. APPLICATION This specification was released originally for material used for oil retaining rings on units. NOTICE: This material absorbs and retains moist
3、ure. 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 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Com
4、panys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.3 CONDITIONING AND TEST CONDITIONS All test values indicated herein are based on material and specimens with moisture content not exceeding 0.2% (test according to ISO 960, Method B/ASTM D 789). All test materials immediately a
5、fter processing have to be sealed in containers that are impermeable to water vapor. If the 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 humid
6、ity. Individual specimens shall not be removed from closed containers until immediately before testing. 3.4 MOLDING COMPOUND 3.4.1 Melt Temperature 175 - 185 C (ISO 1218, Method B/ASTM D 789, or DSC - ASTM E 794) 3.5 MOLDED TEST SPECIMEN 3.5.1 Preparation of Test Specimens Unless otherwise specified
7、 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 ENGINEERING MATERIAL SPECIFICATIONWSK-M4D739-A2 Printed copies are uncontrolled Copyright 200
8、6, Ford Global Technologies, LLC Page 2 of 4 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. 3.5.2 Density 1.00 - 1.03 g/cm3(ISO 1183, Method A/ASTM D 792, Method A1) 3
9、5.3 Tensile Strength at Yield, min 38 MPa (ISO R 527/ASTM D 638M 150 x 10 x 4.0 +/- 0.2 mm specimen, 50 mm/minute test speed) 3.5.3.1 Elongation at Yield, min 4% (Test Method according to para 3.5.3) 3.5.4 Flexural Modulus, min 1.2 GPa (ISO 178/ASTM D 790M, Method I, Procedure A, 80 x 10 x 4.0 +/-
10、0.2 mm specimen, 64 mm support span) 3.5.5 Shear Modulus at 23 C 470 - 710 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 t
11、ime at each temperature interval - 3 minutes minimum). Additionally, a Shear Modulus vs. Temperature curve shall be plotted for -50 to +160 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, Meth
12、od 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 4 kJ/m23.5.6.2 At -40 +/- 2 C kJ/m2The 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
13、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) 3.5.7.1 At 1.82 MPa 40 C 3.5.7.2 At 0.45 MPa 90 C ENGINEERING MATERIAL SPECIFICATIONWSK-M4D739-A2 Printed copies are unc
14、ontrolled Copyright 2006, Ford Global Technologies, LLC Page 3 of 4 3.5.8 Heat Aging Performance (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 1000 h at 130 +/- 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 dete
15、rmined at the time of the aged properties determination) 3.5.8.1 Tensile Strength at Max Load Change +/- 25% (Test Method per para 3.5.3) 3.6 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. 3.7
16、 FOGGING (FLTM BO 116-03) Fog Number, min 60 The formation of droplets or coalescence into a clear film is cause for rejection. 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
17、 THERMAL EXPANSION 9 13-5/ C (ASTM D 696) 5.2 MOLD SHRINKAGE, FLOW AND TRANSVERSE DIRECTIONS (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 1.3 - 1.7% 5.2.2 Post Shrinkage (Separate specimens required for each test) . After
18、 48 h at 80 C 0.03 - 0.1% . After 30 minutes at 120 C 0.1 - 0.3% 5.3 WATER ABSORPTION 0.1 - 0.3% (ISO 62, 24 h/ASTM D 570, 24 h, 50 +/- 1 mm diameter, 3.2 +/- 0.2 mm thick specimen) ENGINEERING MATERIAL SPECIFICATIONWSK-M4D739-A2 Printed copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 4 of 4
