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Report of Standards and Nomenclature Committee 35
(15) seconds; the burning time being determined with a sample of standard size and according to the procedure of the Underwriter's Laboratories.
Dimension of Test Sample
Length : 36 inches, 914.4 mm.
Thickness : 0.005 to 0.006 inch, 0.122 to 0.152 mm. .
Width : 0.630 to 1.378 inches, 16 to 35 mm.
This definition was formulated after a consideration of the data on burning time of various samples of film base and newsprint paper shown in Tables I, II, III, IV, and V. These data were obtained by using samples from various sources, both domestic and foreign, and represent fairly well the materials now commercially available. The tests were run according to the procedure of the Underwriter's Laboratories, as follows :
"Strips of the product and ordinary newsprint 1" wide and . 10" long, and V wide and 36" long, were suspended vertically
by a small wire through a pin hole at one end of the strips. A
gas test flame %" long and 1/4" in diameter was applied at the
lower end of the suspended strips. The relative ea^e of ignition,
height of flame and time required for complete combustion were
observed. ' ' The tests were made in a place protected as far as possible from drafts, although no hoods or shields were used.
The column designations are as follows:
L — length of test sample (inches)
T — thickness of test sample (thousandths of inches)
W — width of test sample (mm.)
T^ — time of ignition (seconds)
L/ — length of flame (inches)
Tc — combustion time (seconds)
No statement has been made as to the temperature and relative humidity of the samples or the atmosphere in which the tests should be made. This factor will have relatively little effect on the test of film base. It is quite possible that the relative humidity of the newsprint sample will affect the burning time. The tests quoted in Table III were made at room temperature (70°F) and the samples were in equilibrium with an atmosphere of approximately 40 per cent relative humidity.