1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2009 08 26 N-STATUS No known use. No Replacement Named C. Mracna, NA 2004 07 29 Revised Para 3.0 inserted; paras 3.1, 3.2 3.3, 3.7, 3.8 and 4 deleted 1989 10 30 Released NB00E10033451002 L. A. Graham GAM L. Moriarty Printed copies are uncontro
2、lled Copyright 2009, Ford Global Technologies, LLC Page 1 of 4 POLYURETHANE (PUR) MICROCELLULAR ELASTOMER, ESB-M2D348-A4 REACTION INJECTION MOLDED (RIM), PAINTABLE, INTERIOR NOT TO BE USED FOR NEW DESIGN 1. SCOPE The material defined by this specification is a reaction injection molded (RIM) thermos
3、etting polyurethane that will be molded in color to compliment the topcoat paint color. 2. APPLICATION This specification was released originally for material used in the manufacture of airbag deployment doors which may have a fabric insert molded into the part. 3. REQUIREMENTS 3.0 STANDARD REQUIREM
4、ENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.4 MOLDED TEST SPECIMEN 3.4.1 Preparation of Test Specimens All test specimens shall be cut from 3.2 mm nominal thickness slab stock prep
5、ared from production compound. 3.4.2 Density 0.92 - 1.08 g/cm3(ASTM D 792, Method A) 3.4.3 Hardness, Durometer A 70 - 76 (ASTM D 2240, instantaneous) 3.4.4 Tensile Strength, min 3.8 MPa (ASTM D 412, Die A, 500 mm/minute test speed) 3.4.4.1 Elongation at Break, min 85% (Test Method acc. to 3.4.4) 3.4
6、5 Tear Strength, min 12 kN/m (ASTM D 624, Die C, 500 mm/minute test speed) 3.4.6 Flexural Modulus (ASTM D 790, Method I, Procedure B, 25 x 100 mm specimen size, 50 mm span, 13 mm test speed) ENGINEERING MATERIAL SPECIFICATIONESB-M2D348-A4 Printed copies are uncontrolled Copyright 2009, Ford Global
7、Technologies, LLC Page 2 of 4 3.4.6.1 At - 30 +/- 2 C, max 29 MPa 3.4.6.2 At 23 +/- 2 C, min 7.6 MPa 3.4.7 Shear Modulus at 23 C 4 - 6 MPa (ASTM D 4065, forced constant amplitude, fixed frequency of 1 Hz +/- 15%, strain level below 1%. Specimen approx. 60 x 10 x 3.2 +/- 0.2 mm cut from the center of
8、 the tensile specimen) Additionally, a Shear Modulus vs. Temperature curve shall be plotted for -50 to + 150 C temperature range, at 5 C minimum intervals. The plotted curve must be within tolerance range shown on page 5. 3.4.8 Water Immersion Dimensional + 1.4% Stability, Expansion, max (FLTM BO 12
9、9-01, after 240 h) 3.4.9 Water Absorption, By Weight, max (FLTM BO 129-02) 3.4.9.1 After 24 h 4.4% 3.4.9.2 After 240 h 6.5% 3.4.10 Heat Aging Performance (ASTM D 573, 1000 h at 100 +/- 2 C. Unaged property values shall be determined at the time of the aged properties determination) 3.4.10.1 Tensile
10、Strength Change +/- 25% (Test Method per para 3.4.4) 3.4.10.2 Tear Strength Change, max +/- 25% (Test Method per para 3.4.5) 3.4.11 Fogging (FLTM BO 116-03) Fog Number, min 90 Any fog film present shall be examined for the formation of droplets or coalescence into a clear film. Such conditions, if p
11、resent, shall be cause for rejection. 3.4.12 Instrumented Impact Test (ASTM D 3763, Dynatup, 12.7 mm tup) At - 40 +/- 2 C 40 J ENGINEERING MATERIAL SPECIFICATIONESB-M2D348-A4 Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 3 of 4 3.5 FLAMMABILITY (ISO 3795) Burn Ra
12、te, max 100 mm/minute The specimen size required for material approval is 355 x 100 x 3.2 +/- 0.1 mm with a smooth surface. 3.6 PAINTABILITY The material when painted must meet the requirements of engineering performance specifications shown on the engineering drawing, using coating materials approv
13、ed by the responsible product materials engineering office. 5. GENERAL INFORMATION The information below is provided for clarification and assistance in meeting the requirements to the specification. 5.1 COEFFICIENT OF LINEAR THERMAL EXPANSION 13.5E-5/ C (ASTM D 696) 5.2 MOLD SHRINKAGE 0.7 - 0.8% (ASTM D 955) ENGINEERING MATERIAL SPECIFICATIONESB-M2D348-A4 Printed copies are uncontrolled Copyright 2009, Ford Global Technologies, LLC Page 4 of 4
