1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2006 04 13 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.8, 3.9 & 4 1994 12 01 Completely Revised EP00E10348618000 L. Rodigas 1992 03 02 Released EP00E10176262000 L. Rodigas Printed copies are uncontrolled Copyright 2006, Ford Global Technolo
2、gies, LLC Page 1 of 5 ACETAL (POM) COPOLYMER, ELASTOMER MODIFIED WSK-M4D839-A MOLDING COMPOUND, EXTERIOR 1. SCOPE The material defined by this specification is an elastomer modified acetal copolymer based on trioxane, UV stabilized for exterior use 2. APPLICATION This specification was released orig
3、inally for material used for exterior functional automotive applications such as windshield wiper clips etc. 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-M99P1
4、111-A). 3.1.1 All requirements of this specification, identified by symbol(s), shall be met with data representing 3 sigma values. 3.4 MOLDING COMPOUND 3.4.1 Melt Flow Rate 16 - 22 g/10 minutes (ISO 1133, 190 C, 2.16 kg) 3.5 MOLDED TEST SPECIMEN 3.5.1 Preparation of Test Specimens Unless otherwise s
5、pecified 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 Specimens with shorter dimensions shall be cut from the center portion of the test sp
6、ecimen A and/or B. The specimens shall be prepared according to ISO 294. No annealing allowed. 3.5.2 Density 1.37 - 1.41 g/cm (ISO 1183, Method A) ENGINEERING MATERIAL SPECIFICATIONWSK-M4D839-A Printed copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 2 of 5 3.5.3 Tensile St
7、rength at Yield, min 43 MPa (ISO R 527, 150 min x 10 x 4.0 +/- 0.2 mm specimen, 50 mm/minute) 3.5.3.1 Elongation at Break, min 50% (Test Method according to para 3.5.3) 3.5.4 Flexural Modulus, min 1.7 GPa (ISO 178, 80 x 10 x 4.0 +/- 0.2 mm specimen, 64 mm support span) 3.5.5 Shear Modulus at 23 C 0.
8、67 - 1.0 GPa (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 minutes minimum). Additionall
9、y, 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 5. 3.5.6 Impact Strength, Izod, min (ISO 180/1A, 80 x 10 x 4.0 +/- 0.1 mm specimen, 10 specimens for each test) 3.5.
10、6.1 At 23 +/- 2 C 5.0 kJ/m 3.5.6.2 At -40 +/- 2 C 3.5 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. 3.5.7 Heat Deflection Temperature, min (ISO 75, 120 x 10 x 4.0 +/-
11、0.2 mm specimen, 0.32 +/- 0.01 mm deflection) 3.5.7.1 At 1.80 MPa 77 C 3.5.7.2 At 0.45 MPa 138 C 3.5.8 Heat Aging Performance (ISO 188, except 150 +/- 50 air changes/h, 1000 h at 100 +/- 2 C. Unaged property values shall be determined at the time of the aged properties determination) ENGINEERING MAT
12、ERIAL SPECIFICATIONWSK-M4D839-A Printed copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 3 of 5 3.5.8 1 Tensile Strength at Yield +/- 20% (Test Method per para 3.5.3) 3.5.8.2 Impact Strength, Izod Change, max +/- 25% (Test Method per para 3.5.6.1, specimens to be notched be
13、fore heat aging) 3.6 FLAMMABILITY (ISO 3795) Burn Rate, max 100 mm/minute The specimen size required for material approval is 355 x 100 x 1.9 +/- 0.1 mm with a smooth surface. 3.7 WEATHERING RESISTANCE After exposure in accordance with 3.7.1, 3.7.2 and 3.7.3, the material shall show no color change
14、in excess of specified Gray Scale rating (AATCC Evaluation Procedure 1/ISO 105-A02). In addition, there shall be no cracking, crazing or other deterioration. A slight loss of gloss or chalking will be allowed provided an acceptable appearance can be achieved by washing and/or polishing with Ford car
15、 polish (auto wax) after the outdoor exposure, at permission of the affected Product Development Materials Activity. All initial approvals will be based on the preliminary Weatherometer exposure, pending Florida and Arizona exposure results for final approval. 3.7.1 Xenon Arc Weatherometer Rating 4
16、SAE J1960, 1060 kJ/m exposure minimum, specimen size: 150 x 100 mm minimum, 3.2 +/- 0.2 mm thick, molded in smooth polished mold) 3.7.2 12 months Florida Rating 4 12 months Arizona (NAAO only) (SAE J1976, 5 south, direct weathering inland, specimen size: 150 x 100 mm, minimum, 3.2 +/- 0.2 mm thick,
17、 molded in smooth polished mold) 3.7.3 24 months Florida Rating 3 - 4 24 months Arizona (NAAO only) (SAE J1976, 5 south, direct weathering inland, specimen size: 150 x 100 mm, minimum, 3.2 +/- 0.2 mm thick, molded in smooth polished mold) ENGINEERING MATERIAL SPECIFICATIONWSK-M4D839-A Printed copies
18、 are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 4 of 5 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 EXPANSION 12 16-5/ C (ASTM E 228 or TMA, te
19、mperature range -20 to +40 C) 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 1.6 - 2.1% 5.2.2 Post Shrinkage (Separate specimens required for each test) . After 48 h at 80 C 0.10 - 0.40% . After 48 h at 1
20、20 C 0.10 - 0.40% 5.3 WATER ABSORPTION 0.20 - 0.30% (ISO 62, 24 h, 50 +/- 1 mm diameter, 3.1 +/- 0.1 mm thick specimen) 5.4 HARDNESS, DUROMETER D 75 - 80 (ISO 868, 15 s dwell) 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. 5.6 RECYCLING CODE POM ENGINEERING MATERIAL SPECIFICATIONWSK-M4D839-A Printed copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 5 of 5
