1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 08 28 N-STATUS Replaced by WSS-M99P32-C C. Mracna, NA 2004 09 29 Revised Inserted 3.0; Deleted 3.1, 3.2, 3.3, 3.8, 3.9 & 4 1991 10 24 Released C10171255 P. Thomas Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, L
2、LC Page 1 of 3 POLYURETHANE (PUR) FOAM, ACOUSTICAL WSD-M2D446-A1 POLYURETHANE (PUR) FOAM, ACOUSTICAL WSD-M2D446-A2 NOT TO BE USED FOR NEW DESIGN 1. SCOPE The materials defined by these specifications are CFC-free flexible polyurethane foams offering acoustic absorption properties with limited water
3、absorption. WSD-M2D446-A1 Polyether polyurethane flexible foam with a polyurethane film facing and backed with a PVC sheet of polyurethane film. WSD-M2D446-A2 Polyester polyurethane flexible foam with a heat generated self-skin facing and backed with an impervious polyurethane film. 2. APPLICATION T
4、hese materials were originally released as engine compartment insulators and bulkhead liners for reducing engine noise on Transit. 3. REQUIREMENTS 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Productio
5、n Materials (WSS-M99P1111-A). 3.4 APPEARANCE The foam shall be colorless, clear or as specified on Engineering drawings. It shall have a homogeneous cell structure with no large voids or cracks which may impair the serviceability of the part. 3.5 POLYURETHANE FOAM The following material properties s
6、hall be determined on specimens taken from the foam core 6 - 10 mm from the surface skin, unless otherwise specified. This specimen shall be free of voids, hard spots and densification lines. 3.5.1 Density, Core, min 21 kg/m3(ISO 845/ASTM D 3574, Test A) 3.5.2 Tensile Strength, min 50 kPa (ISO 1798/
7、ASTM D 3574, Test E, 50 mm bench marks, 5 specimens minimum) 3.5.2.1 Elongation at Break, min 200% (Test according to para 3.5.2) ENGINEERING MATERIAL SPECIFICATIONWSD-M2D446-A1/A2Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 2 of 3 3.5.3 Tear Strength, min 500 N
8、/m (ISO DIS 8067/ASTM D 3574, Test F, 50 mm/minute test speed) 3.5.4 Heat Aging (ISO 2440/ASTM D 3574, Test K, 22 h at 140 +/- 2 C) 3.5.4.1 Compression Deflection Stress Change, max +/- 30% (ISO 3386/1, 40% compression, 100 x 100 x 50 mm specimen, 100 +/- 20 mm/minute test speed, 3 specimens minimum
9、) 3.5.5 Humidity Aging (AUTOCLAVE) (ISO 2440/ASTM 3574, Test J, 100 x 100 x 50 mm specimen, 5 h at 120 C) 3.5.5.1 Compression Deflection Stress Change, max +/- 30% (Test acc. to para 3.5.4.1) 3.6 FINISHED PART REQUIREMENTS In addition to the specification requirements quoted herein, the finished ass
10、embly shall conform with the requirements of the General Performance Specification for Plastic parts, non-decorative applications SS-M99P9883-A. 3.6.1 Bonded Seam Strength (FLTM BN 151-01) The materials described must be capable of being bonded under normal production conditions and must exhibit no
11、faults or defects after bonding. Original, min 20 N/50 mm After 16 h at 100 C, min 20 N/50 mm After Humidity Aging, min 20 N/50 mm 3.6.2 Water Absorption, max 0.25 g Test apparatus shall consist of a 45 inclined plane made from non-absorbent material and of suitable dimensions to fully support test
12、specimens described below. A 25 mL burette and an analytical balance accurate to 0.1 mg are also required. ENGINEERING MATERIAL SPECIFICATIONWSD-M2D446-A1/A2Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 3 of 3 Test Method: Cut ten test specimens from the finished
13、 parts 150 x 75 x part thickness to include a bonded seam (one 75 mm edge). Place a test specimen, acoustic face upwards, on the inclined plane so that the specimen is totally supported and the bonded seam forms the bottom edge of the test assembly and lies horizontally. Fill the burette with distil
14、led water to which two drops of a non-ionic wetting agent has been added per 100 mL. Calibrate a tap position on the burette at which droplets fall at a rate of 1 to 3 drops per second. Close the tap on the burette and position it 50 mm vertically and centrally above the surface of the test specimen
15、 and at a point where droplets will land 50 mm from the top edge of the specimen. Droplets should drip from the bonded seam into a lower receptacle and should not contact the inclined plane or the cut edges of foam at any time. Let 1 mL of solution fall onto the surface and then close the tap. Remov
16、e the test specimen and give it one flick on the top corner to remove any loose surface droplets. Place the specimen on the balance and tare off, or record the weight. This eliminates any solution retained on the surface. Replace the specimen on the inclined plane as before and refill the burette. O
17、pen the tap to the calibrated setting and let 25 mL of solution fall onto the surface. Remove and flick the specimen as before and then record the increase of weight. Repeat the procedure for the remaining test specimens and average the results. 3.6.3 Acoustic Properties As specified on engineering (ISO 354) drawing 3.7 FLAMMABILITY (ISO 3795/SAE J369) Burn Rate, max 100 mm/minute
