TITLE 49 – TRANSPORTATION
CHAPTER V – NATIONAL HIGHWAY TRAFFIC SAFETY ADMINISTRATION, DEPARTMENT OF TRANS-PORTATION
孕妇发烧怎么退烧
PART 571 – FEDERAL MOTOR VEHICLE SAFETY STANDARDS
Subpart B – Federal Motor Vehicle Safety Standards
Sec. 571.302 Standard No. 302;
FLAMMABILITY OF INTERIOR MATERIALS
Basic version: F. R. of December 2, 1971
Last amendments: F. R. of May 27 and September 24, 1998
Applicable: May 27, 1999 mandatory, May 27 and September 24,1998 optional
Contents:
Sec. 571.302 Standard No. 302; Flammability of interior materials (1)
S1. Scope (1)
S2. Purpo (1)
S3. Application (1)
S3A. Definitions (1)
S4. Requirements (1)
S5. Test procedure (2)
花的图片大全S1. Scope
大葱吃法This standard specifies burn resistance requirements for materials ud in the occupant compartments of motor vehicles.
S2. Purpo
The purpo of this standard is to reduce the deaths and injuries to motor vehicle occupants caud by vehicle fires, especially tho originating in the interior of the vehicle from sources such as match
es or cigarettes.
S3. Application
This standard applies to pasnger cars, multipurpo pasnger vehicles, trucks, and bus.
S3A. Definitions描写人物品质的成语
“Occupant compartment air space” means the space within the occupant compartment that normally con-tains refreshable air.
S4. Requirements
S4.1 The portions described in S4.2 of the following components of vehicle occupant compartments shall meet the requirements of S4.3: Seat cushions, at backs, at belts, headlining, convertible tops, arm rests, all trim panels including door, front, rear, and side panels, compartment shelves, head restraints, floor coverings, sun visors, curtains, shades, wheel housing covers, engine compartment covers, mattress covers, and any other interior materials, including padding and crash-deployed elements, that are designed to absorb energy on contact by occupants in the event of a crash.
S4.1.1 [Rerved]
S4.2 Any portion of a single or composite material which is within 13 mm of the occupant compartment air space shall meet the requirements of S4.3.
S4.2.1 Any material that does not adhere to other material(s) at every point of contact shall meet the re-quirements of S4.3 when tested parately.
S4.2.2 Any material that adheres to other materials at every point of contact shall meet the requirements of S4.3 when tested as a composite with the other material(s).
Occupant Compartment Air Space
All Dimensions in Millimeters (mm)
Material A has a non-adhering interface with material B and is tested parately. Part of material B is within 13 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 13 mm thick.
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S4.3(a) When tested in accordance with S5, material described in S4.1 and S4.2 shall not burn, nor trans-mit a flame front across its surface, at a rate of more than 102 mm per minute. The requirement concern-ing transmission of a flame front shall not apply to a surface created by cutting a test specimen for pur-pos of testing pursuant to S5.
(b) If a material stops burning before it has burned for 60 conds from the start of timing, and has not burned more than 51 mm from the point where the timing was started, it shall be considered to meet the burn-rate requirement of S4.3(a).
S5. Test procedure (*)
S5.1 Conditions
S5.1.1 The test is conducted in a metal cabinet for protecting the test specimens from drafts. The interior of the cabinet is 381 mm long, 203 mm deep, and 356 mm high. It has a glass obrvation window in the front, a closable opening to permit inrtion of the specimen holder, and a hole to accommodate tubing for a gas burner. For ventilation, it has a 13 mm clearance space around the top of the cabinet, ten holes in the ba of the cabinet, each hole 19 mm in diameter and legs to elevate the bottom of the cabinet by 10 mm, all located as shown in Figure 1.
S5.1.2 Prior to testing, each specimen is conditioned for 24 hours at a temperature of 21 deg.C, and a relative humidity of 50 percent, and the test is conducted under tho ambient conditions.
(*) Editorial note: Heading supplemented.
S5.1.3 The test specimen is inrted between two matching U-shaped frames of metal stock 25 mm wide and 10 mm high. The interior dimensions of the U-shaped frames are 51 mm wide by 330 mm long. A specimen that softens and bends at the flaming end so as to cau erratic burning is kept horizontal by supports consisting of thin, heat-resistant wires, spanning the width of the U-shaped frame under the specimen at 25 mm intervals. A device that may be ud for supporting this type of
material is an additional U-shaped frame, wider than the U-shaped frame containing the specimen, spanned by 10-mil wires of
年味作文800字heat-resistant composition at 25 mm intervals, inrted over the bottom U-shaped frame.
S5.1.4 A bunn burner with a tube of 10 mm inside diameter is ud. The gas adjusting valve is t to provide a flame, with the tube vertical, of 38 mm in height. The air inlet to the burner is clod.
S5.1.5 The gas supplied to the burner has a flame temperature equivalent to that of natural gas.
S5.2 Preparation of specimens
S5.2.1 Each specimen of material to be tested shall be a rectangle 102 mm wide by 356 mm long, wher-ever possible. The thickness of the specimen is that of the single or composite material ud in the vehicle, except that if the material's thickness exceeds 13 mm, the specimen is cut down to that thickness meas-ured from the surface of the specimen clost to the occupant compartment air space. Where it is not pos-sible to obtain a flat specimen becau of surface curvature, the specimen is cut to not more than 13 mm in thickness at any point. The maximum available length or width of a specimen is ud where either di-mension is less than 356 mm or 102 mm, respectively, unless surrogate testing is required under S4.1.1.
S5.2.2 The specimen is produced by cutting the material in the direction that provides the most adver test results. The specimen is oriented so that the surface clost to the occupant compartment air space faces downward on the test frame.
S5.2.3 Material with a napped or tufted surface is placed on a flat surface and combed twice against the nap with a comb having ven to eight smooth, rounded teeth per 25 mm.
论字开头的成语
S5.3 Procedure
(a) Mount the specimen so that both sides and one end are held by the U-shaped frame, and one end is even with the open end of the frame. Where the maximum available width of a specimen is not more than 51 mm, so that the sides of the specimen cannot be held in the U-shaped frame, place the specimen in position on wire supports as described in S5.1.3, with one end held by the clod end of the U-shaped frame.
(b) Place the mounted specimen in a horizontal position, in the center of the cabinet.
2022除夕祝福语(c) With the flame adjusted according to S5.1.4, position the bunn burner and specimen so that the cen-ter of the burner tip is 19 mm below the center of the bottom edge of the open end of the specimen.
(d) Expo the specimen to the flame for 15 conds.
(e) Begin timing (without reference to the period of application of the burner flame) when the flame from
the burning specimen reaches a point 38 mm from the open end of the specimen.
(f) Measure the time that it takes the flame to progress to a point 38 mm from the clamped end of the specimen. If the flame does not reach the specified end point, time its progress to the point where flaming stops.
(g) Calculate the burn rate from the formula:
B = 60 x (D/T)
Where:
B = Burn rate in millimeters per minute
D = Length the flame travels in millimeters, and
T = Time in conds for the flame to travel D millimeters.
Figure 1
All dimensions in millimeters (mm)
