1、 ENGINEERING MATERIAL SPECIFICATIONDate Action Revisions 2003 07 18 Activated L. Soreide Printed copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 1 of 3 BARRIER, ACOUSTICAL WSS-M5G52-B 1. SCOPE This classification system is used to identify the performance levels required
2、from sound barrier materials used in automotive applications. 2. APPLICATION This specification was released originally for materials used as sound transmission barriers. 3. REQUIREMENTS 3.1 STANDARD REQUIREMENTS FOR PRODUCTION MATERIALS Material suppliers and part producers must conform to the Comp
3、anys Standard Requirements For Production Materials (WSS-M99P1111-A). 3.2 FLAMMABILITY (ISO 3795/SAE J369) Burn Rate, max 100 mm/minute 3.3 SOUND TRANSMISSION LOSS Required for (SAE J1400, or as specified on initial approval only engineering drawing) Unless otherwise specified on the engineering dra
4、wing, the sound transmission loss shall meet or exceed the calculated “mass law“ Sound Transmission Loss (STL) values from 125 or 4000 Hz for every one-third octave within the precision described in ASTM E 90. Mass Law: STL (dB) = 20 log (weight) + 20 log (frequency) - 47.2 dB Weight in kg/m2Frequen
5、cy in Hz 3.4 ODOR Rating 2 (FLTM BO 131-01) Test Method: Samples heated in a closed container for a minimum of 2 h at 100 +/- 2 C 3.5 FOGGING (SAE J1756, 3 h at 100 C heating, 21 C cooling plate, post test conditioning 1 h and 16 h) Fog Number, min 70 Formation of clear film, droplets or crystals is
6、 cause for rejection. ENGINEERING MATERIAL SPECIFICATIONWSS-M5G52-BPrinted copies are uncontrolled Copyright 2003, Ford Global Technologies, Inc. Page 2 of 3 3.6 ADDITIONAL LINE CALLOUT REQUIREMENTS Shall be specified on engineering drawing and approved source list Create a seven character line call
7、out for the material using the classification system below. 3.6.1 First Character Material Type Code Letter not specified A polyvinyl chloride B ethylene vinyl acetate C urethane D plastisol E reclaimed PVC/fabric F reclaimed elastomer thermoplastic blend G special requirement Z 3.6.2 Second Digit M
8、ass, Mass Code Number tolerance +/- 10 % (ASTM D 461) 0.49 kg/m2= 1 1.46 kg/m2= 2 2.44 kg/m2= 3 3.66 kg/m2= 4 4.88 kg/m2= 5 special requirement = 9 Specific Gravity 3.6.3 Third Digit Specific Code Number Gravity, tolerance +/- 5 % (ASTM D 792) 1.32 = 1 1.70 = 2 1.80 = 3 1.90 = 4 2.10 = 5 2.30 = 6 2.
9、50 = 7 special requirement = 9 3.6.4 Fourth Digit Tear Tear Strength Code Number Strength, min (ASTM D 624, Die C) 3.5 kN/m = 1 10 kN/m = 2 20 kN/m = 3 30 kN/m = 4 40 kN/m = 5 50 kN/m = 6 special requirement = 9 ENGINEERING MATERIAL SPECIFICATIONWSS-M5G52-BPrinted copies are uncontrolled Copyright 2
10、003, Ford Global Technologies, Inc. Page 3 of 3 3.6.5 Fifth Digit No cracking Cold Flexibility Temperature Code Number 20 C = 1 Condition 50 x 150 mm 10 C = 2 samples and a 50 mm diameter 0 C = 3 mandrel at the specified - 10 C = 4 temperature for a minimum - 20 C = 5 of 4 h. Bend sample - 30 C = 6
11、180 around the mandrel - 40 C = 7 in the freezer. special requirement = 9 3.6.6 Sixth digit No cracking Heat Resistance Temperature Code Number 50 C = 1 Age 50 x 150 mm samples at 60 C = 2 the specified temperature 70 C = 3 for a minimum of 4 h, and 80 C = 4 then test per para. 3.6.5 90 C = 5 Cold Flexibility. 100 C = 6 110 C = 7 120 C = 8 special requirement = 9
