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Note: In the event of conflict between the English and domestic language, the English language shall take precedence 1. This test method shall be used to determine the horizontal burn rate of automotive materials. Burn rate is determined immediately following an exposure for a short duration to a small flame.
The small flame is placed in contact with one edge of the material 1. Not applicable 1. The method permits testing of materials and parts of the vehicle interior, individually or in combination up to a thickness of 13 mm. It is normally only applicable to materials and parts within a 13 mm range to the passenger compartment air space All sources supplying parts or materials to this requirement must perform routine quality control testing to confirm compliance of each lot of material or parts produced 1.
Each lat of material shall have a unique identification. When a source location can demonstrate that their process does not adversely affect flammability, the source location may use test data from each lot of incoming material 2 References Note: Only the latest approved standards are applicable unless otherwise specified 2.
One configuration satisfying these requirements is shown in Figures At thru A3. The test cabinet consists of a rectangular steel cabinet of approximately intemal dimensions mm long, mm deep and mm high. It shall have a heat resisting glass observation window, a closable opening to permit insertion of the test specimen mounting fixture and a hole to accommodate tubing for a gas bummer. A 13 mm clearance space around the top of the cabinet, ten 19 mm diameter holes in the base of the cabinet and legs to elevate the bottom of the cabinet by 10 mm are to be provided for ventilation 3.
Chemical fume cupboard suitable for mounting the test cabinet to avoid the diffusion of combustion products to the laboratory during test. A natural venting hood is permissible, provided adequate ventilation is assured. Any forced air ventilation shall be the minimum required for venting, 3.
One configuration satisfying these requirements is shown in Figures Ad and AS. This shall consist of two matching U-shaped frames of metal e. The interior dimensions of the U-shaped frames shall be 51 mm wide by mm long. Gauge lines shall be marked 2. In order to support sub size test specimens and those that soften and bend during test, the lower frame shall have the means to accommodate thin heat resistance wires that span the width of the U-shaped frame at 25 nm intervals.
Grooves cut into the lower frame to accommodate 0. In order to support sub size specimens wh.. One configuration satisfying these requirements is shown in Figure AB. The combustion box shall be placed in a ventilating cabinet. The inner volume of the cabinet shall be 20 to times that of the combustion box, and none of the length, width or height may be more than 25 times greater than either of the other two dimensions.
At points mm from the front and back of the final position of the combustion box, measure the speed of air passing the ventilating cabinet. The speed must be 0. The thickness of the test specimens shall be that of the single or composite material used in the vehicle, except when the materials or composites thickness exceeds 13 mm.
Then the test specimens shall be cut down to 13 mm, measured from the surface of the specimen closest to the passenger compartment air space. As far as possible the test specimens shall be of uniform thickness, 3. If the part is bent so that itis impossible to take a flat sample, then take the part that is most flat and make the arch rise of the sample not more than 13 mm.
If the arch rise of the sample exceeds 13 mm, then make a standard sample with the same material, same technique and same structure as the part mm x mm , and let the thickness be the minimum width but not greater than 13 mm, 3. The minimum acceptable sample size shall be 25 mm in width and mm in length, 3. Where the shape and size of the part are insufficient to be made into 2 standard sample of the specified size, then make a sample of the following minimum size, and keep records a.
Ifthe part is 3 to 60 mm wide, it shall be at least mm long. In this case, make the width of the sample as close to that of the part as possible b.
Ifthe partis wider than 60 mm, it shall be at least mm long. In this case, the possible bumt distance is equivalent to the distance from the first gauge mark to the place where the flame goes out of from the first gauge mark to the end of the sample as shown in Figure 2 c.
If the part is 3 to 60 mm wide but shorter than mm or if it is wider than 60 mm but shorter than mm, it shall not be tested according to GBB Samples narrower than 3 mm shall also not be tested. In sampling the test panels it shall be ensured that they are fully representative of the material or composite under test 3. The material direction of the longitudinal and lateral test specimens must be clearly marked in a manner to identify their original orientation within the roll as shown in Figure 1.
There shall be no ink markings within the test area of the specimen. Eg, Material Rol 2. Material Direction 3. Not applicable 3. Material component information such as vendor name, raw material, production date and pretreatment shall be reported to the test engineer. Not applicable 4 Procedure 4. In addition to tests conducted in the as received condition, all materials which do not meet criteria to 3.
For each direction and condition, see 5. For quality control purposes, at least two specimens from both the lateral and longitudinal direction in the as received condition shall be tested from each production lot. The test shall be performed and the material must comply with the requirements of 5. No further production quality control testing shall be required 4.
Deviations from the requirements of this standard shall have been agreed upon. Such requirements shall be specified on component drawings, test certificates, reports, etc. Where the maximum available width of the test specimen is 50 mm or less, so that the sides of the test specimen cannot be held in the U-shaped frame, place the test specimen in position on the wire supports with one end held by the closed end of the U-shaped frame. Test specimens shorter than mm shall be positioned so that one end aligns with the open end of the U-shaped frame 4.
That means for example the longitudinal test specimens should be alternatively tested in both the material and opposite material directions, The same is valid for the lateral direction. In this case, using the flame as a reference point, the material direction of the test specimens shall be alternatively tested from both the right to left and left to right directions. Ifthe material does not display an identifiable direction, the samples should be tested randomly with respect to the direction of burn and a notation of this exception made on the test report.
If necessary, align the threads in the grooved gauge marks in the upper frame. If used, the first thread will break allowing the weight to fall 4.
Self Extinguishing SE. The test specimen ignites but does not burn to the first timing mark end of Zone B 5. B is calculated from the formula in5. Bis calculated from the formula in 5. In the cases where the sample is ignited by the flame and the flame reaches the first gauge mark within 15 seconds of initial application of the flame, the sample shall be regarded as not meeting the requirements for burning rate, and the result will be recorded as E 5.
The final result will then be based on the mean plus threefold the standard deviation of all observed measurable burn rates from the combined set of ten test specimens 5. This includes samples that fail to ignite DNI , those that do not burn to tlie first gauge mark SE , and those that do not bur more than 50 mm in less than 60 s from the point where timing was started SENBR 5.
Otherwise only the maximum burn rate Byax, calculated from formula in 5. Material described in 1. With reference to this test procedure the results of all measurements along with the maximum burn rate Bhar and the statistical burn rate Bost shall be presented in the attached test report Appendix B 6 Safety This standard may involve hazardous materials, operations, and equipment.
This standard does not propose to address all the safety problems associated with its use. When layers are intermittently held together 2. Exposed Side: The Exposed Side is the side which is facing towards the passenger compartment when the material is mounted in the vehicle as per the intended component design.
Lot: A lot is a batch, a jumbo roll or a quantity of material which has been produced from the same base compound material and is homogeneous in nature.
Passenger Compartment Air Space: The Passenger Compartment Air Space is the space within the passenger compartment that normally contains refreshable air 7. It was first approved by Global Material Engineering in December Section Specific Korean Legal Requirements added. Section Deviations.
Specific Korean Legal Requirements added Section 3. Section 3. Section 5. Ensure that the support wires, if used, are straight and horizontal so as to prevent sagging of test specimens, 3.
Ensure door always fits flush to the test cabinet expansion effects can cause poor door fit leading to drafts 4. Purge the smoke inside the test cabinet for example using compressed air from a hand controlled nozzale after each test.
Before each test ensure as far as possible that the temperature of the test cabinet has not increased excessively spare cabinet covers and U-shaped frames, compressed air are useful optional items 6.
Lead flames a flame that flashes forward of the main burning area usually occur on vinyl coated fabrics and must be observed very carefully by the operator Note: FMVSS legislation defines lead flame. In performing duplicate tests, test specimens should always be cut from the same area of the material considering thickness, width, ribs, etc 8. All ventilation holes must be regularly inspected and cleaned to ensure adequate air circulation in the cabinet, 9.
Particular care must be taken in marking test specimens for identification purposes, since enamels, inks, etc. Test specimens shall be carefully extinguished after removal from test cabinet, e. Following paragraph shall only be applied at the Brazilian market Dev 3.
Test specimens will be taken from parts in vehicles for compliance test by Korean Government Institute Following paragraphs shall only be applied at the Chinese market Dev 3.
GMW 3232-Test Method for Determining the Flammability of Interior Trim Materials
ISO Motor vehicles contain a number of components that can burn if subjected to a large enough ignition source. These include seating, headlining and carpeting. Several test methods have been developed by the motor industry to assess burning behaviour. Materials used within the passenger compartment need to have a degree of burn resistance so that occupants have time to escape the vehicle in the event of a fire. Safety standards such as FMVSS USA , BS AU a and ISO all similar standards have been developed to help reduce deaths and injuries to occupants caused by vehicle fires, especially those originating in the interior of the vehicle from discarded cigarettes and matches. In some cases manufacturers have also developed their own specifications based on these standards.