1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions Ver 4 2008 06 20 N-STATUS Replaced by WSS-M99P32-B G. Kowalski, FNA 2005 05 24 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.6, 3.7, 4 1990 03 01 Released C/01031533 K. Gerhards Printed copies are uncontrolled Copyright 2008, Ford Global Tec
2、hnologies, LLC Page 1 of 2 POLYETHYLENE (PE) FOAM, CROSSLINKED WSK-M4D751-A CLOSED CELL, 50 kg/m3 NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a closed cell, crosslinked polyethylene foam with a nominal density of 50 kg/m3 2. APPLICATION This specification was
3、 released originally for material used as loudspeaker gaskets. 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-M99P1111-A). 3.4 APPEARANCE The foam shall have a h
4、omogeneous medium sized cell structure with no large voids or solid spots which may impair the serviceability of the part. 3.5 TEST SPECIMEN The following material properties are based on foam material with surface skin removed. 3.5.1 Density 50 +/- 5 kg/m3 (ISO 845/ASTM D 3574, Test A) 3.5.2 Tensil
5、e Strength, min 300 kPa (ISO 1798/ASTM D 3574, Test E, 50 mm bench marks, 5 specimen minimum) 3.5.2.1 Elongation at Break, min 120% (Test acc. to 3.5.2) 3.5.3 Compression Set, max 26% (ISO 1856, Method A/ASTM D 3574, Test D, ct calculation, 22 h at 23 C, 50% deflection, 3 specimens, minimum) ENGINEE
6、RING MATERIAL SPECIFICATION WSK-M4D751-A Printed copies are uncontrolled Copyright 2008, Ford Global Technologies, LLC Page 2 of 2 3.5.4 Compression Deflection Stress 90 +/- 20 kPa (ISO 3386/1 at 40% compression, specimen size 100 x 100 x 50 mm, test speed 100 +/- 20 mm/min) 3.5.5 Water Absorption,
7、max 5% (ASTM D 1056, subject specimen to a vacuum of 84 kPa) 3.5.6 Dimensional Stability, max WMD - 8% AMD - 3% Test Method: A specimen approx. 300 x 300 mm in size shall be placed in a mechanical convection oven maintained at 100 +/- 2 C for 3 h. Dimensional changes shall be measured after cooling
8、down to room temperature. 3.5.7 Cold Flexibility at -40 C No cracks (FLTM BN 102-01, diameter of mandrel shall be 2 times of specimen thickness) 3.5.8 Fogging (SAE J1756, 3 h at 100 C heating, 21 C cooling plate, post test conditioning 1 h and 16 h) Fog Number, min 80 Formation of clear film, droplets or crystals is cause for rejection. 3.5.9 Odor, max Rating 2 (FLTM BO 131-01/SAE J 1351) 3.5.10 Flammability (ISO 3795) Burn Rate, max 100 mm/minute The specimen size required for material approval is 355 x 100 x 3.0 +/- 0.1 mm with smooth surfaces.
