FTMS_191A_Method_5903-1978_织物阻燃性测试_垂直法

METHOD 5903

July 20, 1978

FLAME RESISTANCE OF CLOTH; VERTICAL

1.SCOPE

1.1 This method is intended for use in determining the resistance of cloth

to flame and glow propagation and tendency to char.It is designated primarily for cellulosic fabrics treated with a flame retardant, but may be utilized in other applications as specified in applicable procurement documents. In

addition to the vertical position of the sample and flame exposure conditions conmnon to tests of this type, the method defines gas composition, burner, cabinet, temperature and humidity test conditions since it is designed

primarily for interlaboratory testing of the same material.

2.TEST SPECIMEN

2.1 The specimen shall be a rectangle of cloth 2-3/4 inches (70 mm) by 12 inches (305 mm) with the long dimension parallel to either the warp or filling direction of the cloth.No two warp specimens shall contain the same warp yarns, and no two filling specimens shall contain the same filling yarns.

3.NUMBER OF DETERMINATIONS

3.1 Unless otherwise specified in the procurement document, five specimens from each of the warp and filling directions shall be tested from each sample unit.

4.APPARATUS

4.1 Cabinet. A cabinet and accessories, fabricated In accordance with the requirements specified in figures 5903A, B, and C. Galvanized sheet metal or other suitable metal shall be used.The entire inside back wall of the cabinet shall be painted black to facilitate the viewing of the test specimen and

pilot flame (see 7.1.2).

4.2 Burner. The burner shall be equipped with a variable orifice to adjust

pilot light.

4.2.1 The burner may be constructed by combining a 3/8 inch (10 MM) inside diameter barrel 3 ± 1/4 inches (76 ± 6 mm) long from a fixed orifice burner

with a base from a variable orifice burner.

FED. TEST METHOD STD. NO. 191A

METHOD 5903

4.2.2 The pilot light tube shall have a diameter of approximately 1/16

inch (2 mm) and shall be spaced 1/8 inch (3 mm) away from the burner edge with

a pilot flame 1/8 inch (3 mm) long.

4.2.3 The necessary gas connections and the applicable plumbing shall be

as specified in Figure 5903D except that a solenoid valve may be used in lieu

of the stopcock valve to which the burner is attached.The stopcock valve or solenoid valve, whichever is used, shall be capable of being fully opened or

fully closed in 0.1 second.

4.2.4 On the side of the barrel of the burner,opposite the pilot light there shall be a metal rod of approximately 1/8 inch (3 mm) diameter spaced 1/2 inch (13 mm) from the barrel and extending above the burner. The rod shall have two

5/16 inch (8 mm) prongs marking the distances of 3/4 inch (19 mm) and 1 1/2 inch-(38 mm) above the top of the burner,

4.2.5 The burner shall be fixed in a position so that the center of the barrel of the burner is directly below the center of the specimen.

4.3 Gas regulator valve system. A control valve system with a delivery rate designed to furnish gas to the burner under a pressure of 2-1/2 ± 1/4 pounds

per square inch (17.2 kPa ± 1.7 kPa) at the burner inlet. The manufacturer’s recommended delivery rate for the valve system shall include the required pressure (see 7.1.1).

4.4 Gas mixture. A synthetic gas mixture of the following composition within the following limits (analyzed at standard conditions):55 ± 3 percent hydrogen, 24 ± 1 percent methane, 3 ± 1 percent ethane,and 18 ± 1 percent carbon monoxide, which will give a specific gravity of 0.365 + 0.018 (air = 1) and a B.T.U. content of 540 ± 20 btu’s per cubic foot (dry basis)–at 70°F (21°C) (see 7.1.1).

4.5 Metal hooks and-weights.Metal hooks and weights to produce a series of total loads to determine length of char.The metal hooks shall consist of No. 19 gage steel wire or equivalent and shall be made from 3 inch (76 mm) lengths of the wire and bent 1/2 inch (13 mm) from one end to a 45 degree hook.One end of the hook shall be fastened around the neck of the weight to be used.

4.6 Stop watch. Stop watch or other device to measure the burning time to 0.2 second.

4.7 Measuring scale.Measuring scale or metal tape graduated in increments of 1/8 inch (1 mm) to measure the length of char.

FED. TEST METHOD STD. NO. 191A

METHOD 5903

5.PROCEDURE

5.1 The material undergoing test shall be evaluated for the characteristics specified in the applicable procurement document, i.e. after-flame time,

after-glow time and char length on each specimen as applicable.

5.2 All specimens to be tested shall be at moisture equilibrium under standard atmospheric conditions in accordance with Section 4 of this Standard.Each specimen to be tested shall be exposed to the test flame within 20 seconds after removal from the standard atmosphere.

5.2.1 In case of dispute all testing will be conducted under Standard Atmospheric Conditions in accordance with Section 4 of this Standard.

5.3 The specimen in its holder shall be suspended vertically in the cabinet

in such a reamer that the entire length of the specimen is exposed and the

lower end is 3/4 inch (19 mm) above the top of the gas burner. The apparatus

shall be set up in a draft free area.

5.4 Prior to inserting the specimen, the pilot flame shall be adjusted to approximately 1/8 inch (3 mm) in height measured from its lowest point to the

tip .The burner flame shall be adjusted by means of the needle valve in the base

of the burner to give a flame height of 1-1/2 inches (38 mm) with the stopcock

fully open and the air supply to the burner shut off and taped. The 1-1/2 inch

(38 mm) flame height is obtained by adjusting the valve so that the uppermost portion (tip) of the flame is level with the tip of the metal …… 此处隐藏：5830字，全部文档内容请下载后查看。喜欢就下载吧 ……