1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2006 05 05 N-STATUS Replaced by WSS-M99P32-B; ins 3.0; del 3.1, 3.2, 3.3, 3.8 & 4 A. Reaume 1997 12 12 Activated D. W. Whyte Printed copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 1 of 2 PADDING, THERMOPLASTIC FIBER
2、 BONDED, RANDOM WSS-M17H172-A AIR LAID, 50 KG/M3NOT TO BE USED FOR NEW DESIGN 1. SCOPE The materials defined by this specification are air laid, bonded fiber batts of uniform construction. 2. APPLICATION This specification was released originally for material used as a flat or molded acoustical soun
3、d absorbing fiber pad for noise control assemblies. 3. REQUIREMENTS Material specification requirements are to be used for initial qualification of materials. 3.0 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Companys Standard Requirements F
4、or Production Materials (WSS-M99P1111-A). 3.4 CONSTRUCTION Shall consist of a random, air laid mixture of natural and synthetic fibers firmly bonded with thermoplastic binding fibers. 3.5 COMPOSITION (ASTM D 629) Natural and Synthetic Fiber 50 - 90% Thermoplastic Binding Fibers 10 - 50% 3.6 WEIGHT A
5、ND THICKNESS As specified on (ASTM C 167) engineering drawing Molded parts will have varying density depending upon required thickness. Therefore, for quality control purposes, the weight per unit area must be specified on as received thickness prior to molding. 3.7 PROPERTIES Initial approval prope
6、rty test specimens and results are taken from a sample which is 25 +/- 3 mm thick. ENGINEERING MATERIAL SPECIFICATIONWSS-M17H172-A Printed copies are uncontrolled Copyright 2006, Ford Global Technologies, LLC Page 2 of 2 3.7.1 Density, + 20% - 10% 50 kg/m3(ASTM C 167) 3.7.2 Specific Strength, min 65
7、 kPa (ASTM D 461) 3.7.3 Compression, max 75% (Dry SAE J1352, Method A) 3.7.4 Recovery, Dry and Wet, min 60% (Dry SAE J1352, Method A. Wet SAE J1352, Method D) 3.7.5 Sound Absorption, initial approval only (ASTM C 384) 3.7.5.1 Sound Absorption at 200 Hz 5 Coefficient, min at 500 Hz 15 at 1000 Hz 29 a
8、t 2000 Hz 32 3.7.6 Flammability (ISO 3795/SAE J369, specimens at as received thickness) 3.7.6.1 Burn Rate, max 100 mm/minute 3.7.7 Fogging (SAE J1756, 3 h at 100 C heating, 21 C cooling plate, post test conditioning 1 and 16 h) Fog Number, min 70 Formation of clear film, droplets or crystals is caus
9、e for rejection. 3.7.8 Thermal Conductivity, max 0.06 Wm-1-1 (ASTM C 177, at 90 C, 30 C mean differential, testing required for initial approval only) 3.7.9 Wicking, max 38 mm (SAE J913, 4 h immersion) 3.7.10 Odor, max Rating 2 (FLTM BO 131-01) 3.7.11 Mildew Resistance No visual evidence of mildew growth or mildew odor after 7 days exposure in a humidity cabinet controlled to 90 +/- 5% relative humidity at 38 C.
