1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2006 01 11 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.7, 3.8 & 4 1991 02 01 Revised EP00E01089481000 Revised & Retyped page 1-5 M. Siewert 1990 03 01 Released C/01031533 M. Siewert Printed copies are uncontrolled Copyright 2006, Ford Global Tec
2、hnologies, LLC Page 1 of 4 POLYAMIDE (PA) 12, RIGID, HEAT STABILIZED WSK-M4D739-A MOLDING AND EXTRUSION COMPOUND 1. SCOPE The material defined by this specification is a rigid, heat stabilized polyamide 12 molding and extrusion compound. 2. APPLICATION This specification was released originally for
3、material used for cable coverings and low pressure lines. NOTICE: This 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 3.0 STA
4、NDARD 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 and specimens with moisture cont
5、ent not exceeding 0.2% (test according to ISO 960, Method B/ASTM D 789). All test materials immediately after 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 p
6、ressure 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 before testing. 3.4 MOLDING COMPOUND 3.4.1 Melt Temperature 175 - 185 C (ISO 1218, Method B/ASTM D 789, or
7、DSC - ASTM E 794) 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: ENGINEERING MATERIAL SPECIFICATIONWSK-M4D739-APrinted copies are uncontrol
8、led Copyright 2006, Ford Global Technologies, LLC Page 2 of 4 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
9、 294. No annealing allowed. 3.5.2 Density 1.00 - 1.03 g/cm3(ISO 1183, Method A/ASTM D 792, Method A1) 3.5.3 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 5% (Test Method according to para 3.5
10、.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 +/- 0.2 mm specimen, 64 mm support span) 3.5.5 Shear Modulus at 23 C 430 - 650 MPa (ASTM D 4065, forced constant amplitude, fixed frequency of 1 Hz +/- 15%, strain level below 1%. Specimen approx. 60 x
11、 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. Temperature curve shall be plotted for -50 to +160 C temperature range, at 5 C minimum intervals. The plotte
12、d 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, 80 x 10 x 4.0 +/- 0.2 mm specimen, 10 specimens for each test) 3.5.6.1 At 23 +/- 2 C 20 kJ/m23.5.6.2 At -40 +/- 2 C 5 kJ/m23.5.6.3 At -20 +/- 2 C 5 kJ/m2The test specimen
13、s 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. 3.5.7 Heat Deflection Temperature, min (ISO 75/ASTM D 648, 120 x 10 x 4.0 +/- 0
14、.2 mm specimen) ENGINEERING MATERIAL SPECIFICATIONWSK-M4D739-APrinted copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 3 of 4 3.5.7.1 At 1.82 MPa 40 C 3.5.7.2 At 0.45 MPa 90 C 3.5.8 Heat Aging Performance (ISO 188/ASTM D 573, 150 +/- 50 air changes/h, 1000 h at 130 +/- 2 C.
15、 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 Max Load Change +/- 25% (Test Method per para 3.5.3) 3.6 FLAMMABILITY (ISO 3795)
16、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 assistance in meeting the requirements of this specification. 5.1 COEFFICIENT OF LIN
17、EAR 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) . Af
18、ter 48 h at 80 C 0.03 - 0.10% . After 30 minutes at 120 C 0.10 0.30% 5.3 WATER ABSORPTION 0.10 - 0.30% (ISO 62, 24 h/ASTM D 570, 24 h, 50 +/- 1 mm diameter, 3.2 +/- 0.2 mm thick specimen) 5.4 FOGGING (FLTM BO 116-03) Fog Number, min 50 ENGINEERING MATERIAL SPECIFICATIONWSK-M4D739-APrinted copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 4 of 4
