1、 ENGINEERING MATERIAL SPECIFICATION Date Action Revisions 2006 10 17 N-STATUS Replaced by WSB-M2D402-A3 2004 09 17 Revised Para 3.0 inserted; para 3.1, 3.2, 3.3, 3.7, 3.8 & 4 deleted 1989 04 07 Released SM/EQ15817 TP K. Gerhards Printed copies are uncontrolled Copyright 2006, Ford Global Technologie
2、s, LLC Page 1 of 4 POLYURETHANE (PUR) FOAM, MOLDED WSK-M2D400-A HOT CURED NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a hot cured, molded, flexible polyurethane foam. 2. APPLICATION This specification was released originally for material used in seat cushions
3、 and backs. 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 homogeneous medium sized cell structure with no larg
4、e voids or solid spots which may impair the serviceability of the part. 3.5 TEST SPECIMEN The following material properties shall be determined on specimens taken from the core 6 - 10 mm from the surface skin, unless otherwise specified. This specimen shall be free of voids, hard spots and densifica
5、tion lines. 3.5.1 Density, Core, min 22 kg/m3 (ISO 845/ASTM D 3574, Test A) 3.5.2 Tensile Strength, min 100 KPa (ISO 1798/ASTM D 3574, Test E, 50 mm bench marks, 5 specimens minimum) 3.5.2.1 Elongation at Break, min 130% (Test according to para 3.5.2) 3.5.3 Tear Strength, min 300 N/m (ISO DIS 8067/A
6、STM D 3574, Test F, 50 mm/minute test speed) 3.5.4 Compression Set, max (ISO 1856, Method A/ASTM D 3574, Test D, Ct calculation, 22 h at 70 C, 3 specimens minimum) ENGINEERING MATERIAL SPECIFICATION WSK-M2D400-A Printed copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 2 of
7、4 3.5.4.1 At 50% Deflection 12% 3.5.4.2 At 75% Deflection 20% 3.5.5 Heat Aging (ISO 2440/ASTM D 3574, Test K, 22 h at 140 +/- 2 C) 3.5.5.1 Compression Deflection Stress Change, max 25% (ISO 3386/1, 40% compression 100 x 100 x 50 mm specimen, 100 +/- 20 mm/minute test speed, 3 specimens minimum) 3.5.
8、6 Humidity Aging (AUTOCLAVE) (ISO 2440/ASTM 3574, Test J, 100 x 100 x 50 mm specimen, 5 h at 120 C) 3.5.6.1 Compression Deflection Change Stress Change, max 30% (Test acc. to para 3.5.5.1) 3.5.6.2 Compression Set, max 30% (Test acc. to para 3.5.4.1absolute figures) 3.5.7 Staining None Test Method: C
9、over an approx. 100 mm x 100 mm x 10 mm foam specimen (with surface skin on one side) with a section of light colored standard vinyl (FLTM BN 103-01). Expose assemblies (surface skin of foam facing light source) for 150 h in the Fluorescent Sunlamp Cabinet (equipment as specified in FLTM BO 115-01).
10、 Control specimens of vinyl should also be exposed. Evaluate the standard material after cooling to room temperature. 3.5.8 Fogging, min (FLTM BO 116-03) Fog Number, min 70 3.5.9 Odor, max Rating 2 (FLTM BO 131-01/SAE J1351) 3.5.10 Ash Content, max 1% (ISO 247, Method B/ASTM D 1278, 800 +/- 25 C) 3.
11、5.11 Flammability (ISO 3795) Burn Rate, max 100 mm/minute ENGINEERING MATERIAL SPECIFICATION WSK-M2D400-A Printed copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 3 of 4 3.6 FINISHED PART 3.6.1 Load Indentation (IRGL Value - NAAO ONLY tbd (SAE J815, steps 1-4 only) Values a
12、nd test locations as specified on the engineering drawing. 3.6.2 Product Indentation Hardness Characteristics - EAO ONLY 3.6.2.1 Indentation Hardness at 40% Indentation (H2): As specified on Engineering Drawing. Each individual value must meet the hardness requirement. 3.6.2.2 Sag Factor, min 2.5 3.
13、6.2.3 Recovery, min 70% TEST METHOD A: For parts with parallel surfaces in the test area: ISO 2439, Method B, with the following extension: After measuring the 65% indentation hardness release the load to a rest compression of 25%. Maintain this rest compression for 30 s and measure the force. This
14、figure is used as RH1 for the calculation of the recovery. CALCULATIONS: H3 Sag Factor = - H1 H1 = Indentation Hardness at 25% compression H3 = Indentation Hardness at 65% compression RH1 Recovery = - x 100 H1 H1 = Indentation Hardness at 25% compression RH1 - Residual Indentation Hardness as 25% re
15、st compression TEST METHOD B: For parts with non-parallel surfaces at the test area: Place the part on a matrix that matches the surface contour of the bottom side of the part. The matrix shall have vent holes as described in ISO 2439. Cavities which improve the seat comfort, however, should not be
16、supported. Test area shall be put in horizontal position. ENGINEERING MATERIAL SPECIFICATION WSK-M2D400-A Printed copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 4 of 4 Measure the total height of the part and the matrix with the indentor foot using a preload of 5 N. Remov
17、e the part and measure the average height of the matrix with the indentor foot. Calculate the parts thickness and measure the indentation hardness characteristics as outlined under para 3.6.2. 3.6.3 Fatigue Resistance - NAAO ONLY (FLTM BO 012-04, 375 x 300 x 50 mm sample with molded top surface. Rec
18、ord the average loss of thickness value of 3 specimens tested at 222 N) 3.6.3.1 Seat Cushions Use 267 N Force and fatigue for 20,000 cycles Deg Loss of Thickness, max tbd % 3.6.3.2 Seat Backs and Center Arm Rests Use 133 N Force and fatigue for 10,000 cycles Deg Loss of Thickness, max tbd % Excessiv
19、e surface foam deterioration or foam splitting after required fatigue cycles shall be cause for rejection. 3.6.4 Fatigue Resistance - EAO ONLY (Record the average value of 3 specimens tested) 3.6.4.1 Loss of Hardness, max 35% 3.6.4.2 Loss of Thickness, max 5% TEST METHOD A: For molded parts with par
20、allel surfaces in the test area ISO 3385 applies. TEST METHOD B: For molded parts with non-parallel surfaces in the test area ISO 3385 applies, but with the exception that the part shall be mounted on the matrix used for the determination of the indentation hardness characteristics. The determination of “Loss of Thickness“ is not required for these parts.
