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4 FORD MOTOR COMPANY QUALITY LABORATORY & CHEMICAL ENGINEERING CHEMICAL METHODS RESISTANCE OF PLASTIC MATERIALS TO HYDROGEN SULFIDE STAINING Application This procedure is used for determining the resistance to hydrogen suifide of vinyls, plastics, welts, etc. Apparatus Required Hydrogen sulfide cylinder with valve * Two two-hole #8 rubber stoppers Two 38 x ZOO mm Corning glassware test tubes, or equivalent Glass tubing, cotton packing, plastic tubing and pinch damp, per attached sketch Stopwatch AATCC Chart for measuring transference of color ** Rack or fixture to hold above apparatus * Lecture bottle of hydrogen sulfide and valve may be purchased from the Matheson Co., East Rutherford, N. J. ** Available from the American Association of Textile Chemists t*. Colorists, Research Triangle Park, P. O. Bait 886, Durham, North Caroli; a. Procedure 1. Apparatus is to be assembled per attached sketch and used under a fume hood. Z. Place a Z in. by Z in. sample in Tube "B" which has been previously dried and is free of residual moisture. 3. Add 50 cc tap water to Test Tube "AM, Stopper test tubes per the attached sketch. 4, Open hydrogen sulfide cylinder valve and remove pinch clamp from exhaust hose on Tube "B". Adjust valve so hydrogen sulfide gas MANUFACTURING STAFF Julv 6, 1965 (Revised) Page 1 of 3 MF-MH ANZ-l CHARDO 01103 MF-MH FORD MOTOR COMPANY QUALITY LABORATORY & CHEMICAL ENGINEERING CHEMICAL METHODS RESISTANCE OF PLASTIC MATERIALS TO HYDROGEN SULFIDE STAINING Procedure (Cont'd) entering Tube "A" bubbles through at a controlled uniform .rate so that moisture is not carried into Tube "B". Allow gas to flow through system for 1-1/2 min. Close hydrogen sulfide cylinder valve and replace pinch clamp on Tube "B" exhaust hose. Allow to stand for 2 min. Remove stopper Tube "B" and take out sample, Compare the relative color change with the use of the AATCC Color Chart and report per the Engineering specification. Chemical & Metallurgical Dept. Quality Control Office Merle F. Valade, Manager 0MUFMH manufacturing CHARDO 01104 IF FORD MOTOR COMPANY QUALITY LABORATORY & CHEMICAL ENGINEERING CHEMICAL METHODS MH ANM MANUFACTURING STAFF July 6, 1965 (Revised) Fkge 3 of 3 AN2-1 CHARDO 01105 HMJH KrT mHmiYm imimi c BN! FORD MOTOR COMPANY Supplement No. L QUALIXY LABORATORY & CHEMICAL ENGINEERING PHYSICAL TEST METHODS RESISTANCE TO WET FADE to the warp. Procedure (Coat'd) _ ....... <" T % N I 1.................................. .................... .... r L . . _ A" 3. Mount the specimen in the sample holder with the face side exposed to the arc. 4. Fill the water tank to within 1/2 in. of the top with deionized water and allow the narrow end of the specimen to hang freely in the water during exposure. The water level shall be maintained at the prescribed depth for the duration of the test and the tank cleaned when sediment begins to accumulate. 5. Expose the test specimen for the number of standard hours specified by the material standard. Chemical fc Metallurgical Dept. Quality Control Office Merle F. Valade, Manager February 8, 1980 MF'MH Page 2 Concluded MANUFACTURING T4Ff CHARDO 01106 `V; FORD MOTOR COMPANY QUALITY LABORATORY & CHEMICAL ENGINEERING PHYSICAL TEST METHODS BN1-1 Supplement 2 RESISTANCE TO WET FADE Application This procedure is used to determine the resistance to wet fade of fabrics such as bodycloth and headlining materials by simulating outdoor exposure conditions of high humidity, high temperature and sunlight. Apparatus Required Wate^ Supply Tank A stainless steel tank Z-l/2, in. wide, 4 in. deep and having a convenient length is required for immersion of the sample during exposure. The tank should have the same radius as the inside of the rotating specimen rack and is attached to the rack by means of hooks welded to the tank. (See sketch.) Specimen Rack Test Specimen Specimen Holder Tank Apparatus for Wet Fade Specimen Holder The specimen holder, Type SL-LSR, may be obtained from the Atlas Electric Devices Co, The exposure area of the holder is I -3/4 in. by 5 in.. Procedure 1. Assemble the water tank to the rotating specimen rack. 2. Cut the test specimen as shown with the long dimension parallel February 8, I960 MANUFACTURING SJAFF Page 1 Continued on 2 MFMH BNl-l CHARDO 01107 BN2 -1 FORD MOTOR COMPANY QUALITY LABORATORY & CHEMICAL ENGINEERING PHYSICAL TEST METHODS COLD FLEXIBILITY TEST FOR GENUINE AND ARTIFICIAL LEATHER Procedure (Cont*d) 2. After oven conditioning, remove the test specimen and allow to remain at room temperature for 2 hr to attain moisture equil ibrium. * 3. : Next, place the test specimen, mandrel and cloth gloves in the cold box at - 30 F for 24 hr (unless material specification indi cates otherwise). * 4. At the end of the 24 hr ift the cold box, open the door, put on the gloves, grasp the test specimen in both hands and bend finish side out, as quickly as possible, 180 deg. around the mandrel. 5. Examine for and report any cracks which may occur -in the leather, coating or welt. * Note: In Steps 1, 2 and 3 above, suspend the test specimen in the oven, air and cold box so that there will be free circulation, of air around the test specimen, and check the air surrounding the sample for proper temperature. This will result in better duplication of test results, as some ovens and cold boxes vary in temperature, espec ially near heating and cooling coils. Chemical & Metallurgical Dept, Quality Control Office July 15, 1958 MF-MH Page 2 Concluded MANUFACTURING STAFF CHARDO 01108 w ro Hfc-ffo oHi H Figure 5: BOTTOM U-SHAPED WIRED FRAME [USED FOR SPECIMENS THAT ARE TWO INCHES OR LESS IN WIDTH OR THAT BURN NON-UNIFORMLY) Used in conjunction with either frame shown in figure #f . a ci5n > O H> 73 a o o ^2 \D O' t < j <S*}' ft> ro Hro rfo Figure 3: SPECIMEN HOLDER POSITIONED IN THE SPECIMEN HOLDER SUPPORT o X> o oo \o U3D o VO 3 cn S=Tt ro Bunsen burnez CHARDO 01113 HO& oS.i . vo pw \--\Q0-T 5f Figure 2: SPECIMEN HOLDER SUPPORT (S(RDP ^bd Pro OI n vo i=~ Hu itafgees to be % in (n.omro) \*ioe er TYPICAL MATCHML: STAINLESS STEEL thick T| o r* 0! Oo' o 3 H M oSr a w bd rMiop" MD/ MF-MH Cj55r*& Ford Laboratory Test M thods BN 24-2 FIAMMABILITY TEST FOR AUTOMOTIVE INTERIOR MATERIALS Figure 1: HORIZONTAL FLAMMIBILITY CABINET NOTE: INTERIOR DIMENSIONS (See par. S5.I.I of FMVSS 302) A Tt in (30.I mm) B 2 in (63.5 mm) C 5 in {127*0 nan) BN 2i4-2 Page 10 of 14 Printed in U S A. Manufacturing Staff March 9> 1979 CHARDO 01114 C2|^ Ford Laboratory Test Methods MD/ MF-MH BN 24-2 FLAMMABILICT TEST FOR AUTOMOTIVE INTERIOR MATERIALS BURN RATE ACCEPTANCE CHART Maximum bum rate fflicHBS /.MIN) 91 86 4 cjl" _ ^0 86 76 1 . 64 76 61 43 81 71 66 a 56 SO 46 41 MINIMUM BURN RATE fKILLIMETTERS /MJ]$Q 69 61 53 43 36 28 20 10 5 048 23 3 D 0 0 0 0 23 5 0 0 10 48 23 0 0 12 36 0 NOTE: This is not a sequential sampling plan and once a sampling size has been selected and tested, the results are final. If maximumminimum. burn rates do not comply with the charted requirements, additional sampling is not valid unless physical material revisions are made. Manufacturing Staff March 9, 1979 Pnnled in u.s.A BN '24-2 Page 9 of 14 CHARDO 01115 MD/ MF-MH CdStSj} Ford Laboratory Test M thods BK 24-2 FIAMMABILITT TEST FOR AUTOMOTIVE IMIERIOR MATERIALS Test Procedure (contd.) Hie following information shall be written on or attached to form BAE 7183: (a) The,' size of the sample and the method of measuring the burn rate the sample is less than standard length. (b) A description (sketch) of where the test sample was removed from the part if the location can affect the burn rate. (c) List the referenced "like parts" and blueprint date, (i.e,, when test data is utilized to certify more than one part). (d) A description of all deviations from this procedure including required referenced material. BN 24-2. Page 8 of 14 C. C. Hascall, Manager Chemical & Metallurgical Dept. Product Quality Office Printed in U,S.A, Manufacturing Staff March 9. 1979 CHARDO 01116 Ford Laboratory Test Methods MD/ IVIF-IVIH BN 24-2 FLAMMABILITY TEST FOR AUTOMOTIVE INTERIOR MATERIALS Test Procedure (contd.) 10. Calculate and record the burn rate for the conditions SE/B (paragraph d) and B (paragraph e) from the formula Burn Rate (p) = 60 x ~ Where B D T = Burn rate in inches (millimeters) per minute (rounded to one decimal) Length the flame travels in inches (millimeters) (rounded to one decimal) = Time in seconds for the flame to travel "D" inches (millimeters) 11. Flammability Burn Rate Acceptance Chart (formerly titled "Lot Sampling Plan") (a) The Flammability Burn Rate Acceptance Chart is to be employed for certification to FMVSS No. 302 of Original, unaged materials only. Materials aged in accordance with ESB-M25P3 are not evaluated by the Burn Rate Acceptance Chart, (b) The supplier will take a random sample of specimens of material and determine the burn rate. The randomness of the sample must he assured by strict adherence to th.e standard rules of sampling. (c) The maximum burn rate and the minimum burn rate are selected from the data and compared with the Flammability Burn Rate Acceptance Chart to ascertain either acceptance or rejection of the material. (d) For any given sample size and maximum burn rate, the chart on page 9 reflects the minimum burn rate allowable. e.g. - If one of the pieces in a sample size of 6 has a burn rate of 3-0 in mm), the remaining five test samples must reflect burn rates from 1.4 in (36 mm) to 3*0 in (76 mm). 12, Presentation of Data For Engineering Certification to F/CMVSS 302, report the maximum burn rate on the original (sheet #l) signed and dated copy of form BAE J183* In addition, the remaining burn rates that represent the supplier's lot sampling selection are to be reported on the same sheet. The maximum burn rate must always he reported on the face of the original signed copy, whereas the remaining burn rates shall be reported on the reverse '' ` side of the original BAE 7103 form. All recorded burn rates are thus retained on the original signed copy. Testing performed ori surrogate plaques must be so identified on form BAE 7103 under paragraph 2.0 Part II - Flammability Test Results - Requirements S4. Manufacturing Staff March 9, 1979 PrintB(J in u.S A BN 24-2 Page 7 of 14 CHARDO 01117 MD/ MF-MH Cg^> Ford Laboratory Test Methods BN 24-2 FLAMVIABILITI TEST FOR AUTOMOTIVE 23WERIOR MATERIALS Test Procedure (contd.) (a) Does Not Ignite (DNl). The material does not support combustion during or following the I5 second ignition period and does not transmit a flame from across either surface to the first scribed line. (No Calculation Required) REPORT RESULTS AS FOLLOWS: DUE 0 in/minute (b) Self-Extinguishing (SE). The material ignites on either surface, but the flame extinguishes itself before reaching the first scribed line. (No Calculation Required) SE 0 in/minute (c) Self-Extinguishing/No-Burn Rate (SE/NER). The material stops burning before it has burned for t>0 seconds from the start of timing, and has not burned more than two (2) inches (5O mm) from the point where timing was started. (No Calculation Required) SE/NBR (note) . NOTE: Burn rates for these sample specimens should not be calculated. Instead, the burn rate assigned will be the minimum burn rate from the remaining sample specimens calculated in categories 9 (d) or (e) below or 2 inches (50 mm) per minute whichever is the lesser. If all sample specimens selected are this classification, the lot shall be reported as accepted. ' (d) Self-Extinguishing with a Burn Rate in Inches (Millimeters)/Minute (SE/b), When the leading flame front on either surface progresses beyond the first scribed line, but extinguishes itself SE/B before reaching the second scribed line,- time and measure Calculate its progress to the furthest point where burning stops and Burn Rate calculate and report the burn rate only if the burn distance exceeds 2 inches (50 mm) or the burn time is 60 seconds or greater. Burn Rate in Inches (Millimerers)/Minute (b). The material'burns the full 10 inches (25Q mm). (f) Rapid Burning (RB). The material transmits a flame across either surface more than 2 inches (5O mm) beyond the first scribed line at a rate greater than 4 inches (lOO mm)/minute and too fast to measure accurately; therefore, rio calculation is required. Examples of materials in this category are extremely thin films which burn rapidly, or napped surfaces which "flash". NOTE: Rapid burning of a surface created by cutting the specimen to the l/s in (12-7 mm) maximum dimension does not constitute a failure. The requirement concerning transmission of a flame front shall not apply to a surface created by the cutting of a test specimen. B Calculate Burn Rate RB Over 4 in ,, (100 ram)/min;/fy SuV BN 24-2 Page 6 of 14 ,,, Printed In U.S.A. Manufacturing Staff March 9 1979 CHARDO 01118 <3H> Ford Laboratory Test Methods wdX MF-MH BN 24-2 FLAMMABILITY TEST FOR AUTOMOTIVE INTERIOR MAIERIABS Test Procedure (contd.) 3. With the burner positioned at one end of the cabinet and with the burner air inlets closed, adjust the gas regulating valve to provide a flame 1-1/2 in (37*7 ram) In height. The burner position should be, pre-determined to insure that the center of the burner tip is 3A in (19.O mm) below the center of the bottom edge of the open end of the specimen (See Figure 3), 4. Place the mounted specimen and the stand in the horizontal position into the cabinet and into contact with the flame. 5. Expose the specimen to the flame for 15 seconds, then extinguish the burner flame';or remove the burner from the specimen. 6. From the time of initial burner flame contact with the specimen, observe,for any rapid burning or flame front progression from across- the material's top or bottom surface. Begin timing (without reference to theflj second burner flame application) when the leading flame front reaches the first scribed line 1-1/2 inches (37*7 mm) from the open end of the top or bottom U-shaped frame (see Figure 4}. If the leading flame front progresses more than two (2) inches (50 mm) beyond the first scribed line at such a rapid rate that it cannot be measured'with any degree of accuracy, the material shall be reported as Rapid Burning. NOTE: Caution should be taken to avoid inhalation of combustion products. 7. Measure the time that it takes the leading flame front to progress to the second si^ibed line 1-1/2 inches (37*7 mm) from the clamped end of the top or bottom'U-shaped frame (see Figure 4). 8. If the leading flame front extinguishes itself before reaching the second scribed line, time its progress to the point where flaming stops and measure the furthest distance burned. 9. Use the following definitions to report, complete flammability results as illustrated in the following sketch. :7. Manufacturing Staff March 9, 1979 Pr.mea m'u s a BN 24-2 Page 5 of l4 CHARDO 01119 MD/ MF-MH Ford Laboratory Test Methods BN 2k-2 FL/MMABILITY TEST FOR AUTOMOTIVE! INTERIOR MATERIALS II. Sznall Parts (contd.) A surrogate test plaque specimen made with a composition identical to that of the component material(s) shall he produced in the shape of a rectangle H inches (100 mm) vide, lk inches (356 mm) long and the minimum thickness of the component up to 1/2 inch (12.7 ram) maximum, employing the same or equivalent process as used to produce the component part. The thickness of the plaque is that of the material as utilized in the, vehicle except where it exceeds 1/2 inch (12,7 mm). In those applications, the plaque is to be reduced to a uniform thickness of l/2 inch- (12.7 mm) to include the surface material exposed to the occupant compartment air space. Test Procedure 1. 'Prior to testing, each specimen is conditioned for 2^ hours at a temperature of 73'^- +'3.6 F (23.0 + 2.0 c) and 50 + 5$ relative humidity and the test is conducted under those conditions. 2. Material is placed in the specimen holder as indicated below and tested in thet'dirpetion (transverse or longitudinal) that produces the most adverse results'.1' The specimen is oriented so that the surface closest to the occupant compartment air space faces downward on the test frame. (a) The standard test specimen (k x lk in (100 x 35^ mm) x thickness) is; inserted between two matching IT-shaped frames (specimen holder) so that both sides of the specimen are held by the frames. The temperature of the frame in Figure 4 at the start of each test shall not exceed the conditioned temperature as stated above in Paragraph 1 of Test Procedure. 1 "" (b) Where the maximum available width of the specimen is 2 in (50 mm) or less so that the sides of the specimen cannot be held in the two matching U-shaped frames, it Is to be supported by the use of 10 mil (0.25 mm) wires spanning the-top surface of the bottom U-shaped frame at 1 in (25 mm) intervals, keeping such specimens from bending away from the horizontal at the flaming end, thereby allowing a more uniform and constant burn rate (see Figure 5). The bottom U-shaped frame shall always be positioned so that the wires are "sandwiched" between the top and bottom frames. (c) Samples tested with support wires: Flexible specimens, such as genuine leather, supported, and unsupported vinyls, textile and backing fabrics, foams, textile padding, rubber compounds, etc., that frequently soften and bend at the flaming end so as to cause a non-uniform, uneven burn rate. Samples tested without wires; Less flexible materials such as paperboard, carpets, rigid plastics, etc., seldom soften and bend, at the flaming end; therefore, do not justify or necessitate Support wires. (d) Adjust,ventilation hood door opening to approximately 23 in (580 mm) and regulate -ventilation up to 110 CFM (O.O52 m^/s) maximum air flow to prevent smoke and fumes from entering room. BN 2k-2 Page k of lk Printed in U.S A ' A ^ \{U#:.;. Manufacturing Staff March 9, 1979 CHARDO 01120 CjfrfraT/* Ford Laboratory Test Methods MD/ MF-MH FLAMMABILITY TEST FOR AUTOMOTIVE INTERIOR MATERIALS BN 24-2 iample Selection and Preparation (contd.) Illustrative Example Depth Inches (lILTt) 1/2 f iA_ (12.7) L I6Jti Occupant Compartment Air Space :--_----^--"->----=---------- ------- (a) Non-Adhering Interface'' ------.--U---------------------------- -------- C-----^/(b) Adhering Interface "~ ] 1 (25-4) Material tested separately Materials tested as composite Material (a) has a non-adhering interface with material (b) and Is tested separately. Part of material (b) is within l/2 inch (12-7 mm) of the occupant compartment air space, and materials (b) and (c) adhere at every point of contact: therefore, (b) and (c) are tested as a composite. The cut is in material (c) as shown, to make a specimen l/2 inch (12.7 mm) thick. The sample location in any composite or material shall be that which produces the most adverse burn rate. This is normally the location that has the thinnest cross-section, the lowest density, and/or the deepest pattern. The sample direction for burning shall be that which produces the mo3t adverse burn rate. The most adverse burn direction shall be determined by testing the material in the transverse and longitudinal directions so that1 the surface closest to the occupant compartment air space faces downward on the test frame. Special Surface Preparation Material with a napped or tufted surface is placed on a flat, hard surface and combed twice against the nap with the comb. XI. Small Part s Components, portions of components and composites^ess_than,,.6_..innhea.. f? (T50 mm) ih"the If"longest dimension! \ Manufacturing Stall March 9, 1979 tv. . Printed .in u,s a BN 24-2 Page 3 of 14 CHARDO 01121 Ford LMa' iboratory Test M (hods b ,'rt -v. FTAMMA^ILITY If for FOR AUTOMOTIVE- INFERIOR- 'MATERIALS .//: Application: " : BN pU-2 "V / ' 1 -'tyf.; 1 1 '' , 1 1 ' ' ' /?, , . . , , ' , : ' "t.OTii,sprocedure establishes a uniform method of determining thl/burn rate 'pf auto- ...." motive;materials, component parts, portions of parts,, composites and surrogate plaque, passenger cars, multipurpose passenger vehicles, trucks and buses'-as, defined the Federal Motor Vehicle',Safety Standard No. 302 (*)^/Canadian Motor Vehicle Standard No. 302 (*), Engineering Del-'ign, and .Test''::&t'$iaaard' DD 0.,00-127 (*), ||md/or the-more stringent., requirement such/as DNI (.Does Nolfjgnite), etc., some times imposed by Ford Motor,.Company upon the material for specific applications. # Currant date in effect. b'#y Apparatus Required B4J Uulrnileexr , , - Tirrill, Bunsen.'Vop equivalent, with a regulator, valye, 3/8 inch inside; diameter tube'. TOR Scientific Catalog jpl'JyP.'j-OO'f ;. ' f\ b Burner Fuel :,b ' Natural gas mixture, (typically 900-1100 BTU/ft,3 .(33-5-UO.9,MJ/nf5)) or equivalent '" Horizontal Flammability Equipment >' " bb, :. / See Figures 1 through. 5, or Model 'fo^bA, U.C. Testing Company, ,lUl5 ',Phrk b:1 b/ ./ Avenue, Hoboken, New Jersey 07030. /. .' , b "b ; . // b by;" ..// b ' Veptilkted^^R&bd'' ' /b, 1 ; Cabinet shall be placed in a ventilated hood'approximately Ul .in (lOUO mm) Uigh, UU in;.(1120 mm) wide and 22 in (560 mm) deep. The hood shall have tn:"' " exhaust fan capable /of producing approximately 110 CFM (O.O52 m^/s) air flow. , ' '.Specimen Holder Support 1, ' . ,.;.bbb y.b, V f / U'he specimen /holder shall be supported .horizontally .so1 that the top of, the :'vf/.'.. burner tube is 3/b in (1.9 no) below-the .top surface of the bottom U-shaped '\ ; f^^frame ..when .positioned iri .'the, specimen1 holder 'support ,,(1see Figures1,2 and 3). ' , .Specimen Holder 7 , , ,; / '/ Specimen -.holder consists ,of two identical U-shaped .metal frames made/from /'; chromium or nickel pintod .Tied or other '.non,-corroding metal. (;see .Figure"/); ' :/ ; iere! an:Umpire/Test is required, stool holders must be used. For undersized ,/ / specimensy-a Bottom.U-shaped' wired '.frame shall, be ur/cd (see Figure 5). 1 Environmental' Controls, , '/':f'. ; 'b "fV b' byf^b'b ,/,i/,;':' //:'/:; bb'b.Y , h/bbThe lab oratory/bhall. have, the,;: cbpab11:1ty:,of,.-conditioning, teS/t'- specimens':,;bb r.:' . at (a temperature of 73. b + 3-6 T (?-i.C + 2.0,.C) and a relative -humidity ' dt.pO + %. : , , 1 'v..f:b' b--v b/ '-Q. -b - f f ' fobb/bi, V b. - .. .' #a'/'-! .- ;.` , Manufacturing StaLff/ :;|&/te'rc'h;,9,. 1979-/'/ ^ ^ ' m"iVbL-'. b/;lV ` ' 'b-" b .//t" ' Printed in U.S.A. ` i/'/. :;y' bb'//:/ b'b,: " 1 1 : , ,/i;b., b'b./b) bn:2U_? b , ; b''b ) b/'.b'b.l'aBeblbof ...iV CHAR DO 01122 Ford Laboratory Test Methods BN 24-2 FLAMMABILITY TEST FOR AUTOMOTIVE INTERIOR MATERIALS' Apparatus Required (contd.) Inst rument ation 1 . . Combing device consisting of a comb 4 in (100 mm) wide with 7 to .1 rounded teeth per inch (25 mm), . . Stop.watch, or timing device capable of recording time to 0.1 seco: . Hygrometer . Thermometer . 12 inch scale with 0.1 inch graduations (300 mm scale with 1.0 mm graduations). Sample Selection and Preparation I. Large Parts Specimen Size In all cases the_Iarge,, possible sample size is to be cut franubhe "( cgjteoasfflL ap to the standard specimen of 4,,x_l4 In _{ 100, x ,356,mm),,x v thiaknass. The thickness of the specimen is that of the material as / utilized in the vehicle except where it exceeds l/2 in (12*7 mm) .. .and,in those applications, the specimen is .to be reduced to a uniform thickness of 1/2 in (12.7 mm) to include face side. Where it is not possible to obtain a flat specimen because of component configuration,., the specimen is cut to not more than l/2 in (l,,7 mm) In thickness at any point, from the area with the least curvature and in such a manner as to include the face side. The maximum available length or wldttL-of a,_specimen i^,,ugjj,jfhere.....e,ither_,d.imension is_ less than l4 in (7^6 mm1) or 4jin / ; Selection of Specimen ' The materials evaluated tq pthis test method shall be as follows; (a) , Surface,materials1 taken separately shpll meet1 the requirements; ,, exeep:. when surface materials are1 completely bonded to one or more .substrate .materials, the assembly shall meet the requirements, , 1 (b) Composites consisting of the 'surface material1and underlying materials, 1 -including 'padding and cushioning materials, : as they'appear 'in the , ' vehicle,, , to a depth of,,pne-half inch'.1. 1 ', (c) All padding, and cushioning materials .taken- separately; regardless'/of ' ' their-attachment to each other, -.to-other 'underlying materials,,-or: ,, to r;u,r:'Rce materials. / BN 24-2 -' , .Rage' , 2- of,-,,14' - Pnmeci in u s.a, : , ,'.[ / - - ,y Manufacturing Staff -March 9, '1979,:->/ CHARDO 01123