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September, 1952
P1CKARD AND HJRD : FLAMMABILFFY OF SAFETY FILM
Table I — continued
63
F. Base
5.7
13.5
F. Processed
5.8
13
G. Base
5.6
Film did not continue to burn after the alcohol flame had burnt out.
G. Processed
5.5
Film did not continue to burn after the alcohol flame had burnt out.
H. Base
5.0
Film did not continue to burn after the alcohol flame had burnt out.
H. Processed
6.1
Film did not continue to burn after the alcohol flame had burnt out.
I. Base
5.8
11.5
I. Processed
6.0
11
J. Base
5.8
Film did not continue to burn after the alcohol flame had burnt out.
J. Processed
6.0
Film did not continue to burn after the alcohol flame had burnt out.
K. Processed — not hardened
5.8
11
K. Processed — hardened
5.8
11
L. Processed — not hardened
5.0
12.5
L. Processed — hardened
6.0
11
M. Processed — not hardened
5.8
11.5
M . Processed — hardened
5.7
11.5
Acetate base with 3 per cent, cellulose nitrate as a surface coating
5.7
Film did not continue to burn after the alcohol flame had burnt out.
Negative film on acetate base with cellulose nitrate surface coating
6.2
11
Safety positive no silver image
6.1
Film did not continue to burn after the alcohol flame had burnt out.
Safety positive developed black
6.1
6
Experimental Procedure for 16 mm. Film
Because 16 mm. kinematograph safety film is widely used, a test to cover this size of film is also necessary. Preliminary tests were carried out using an apparatus similar to that shown in Fig. 1 but with the adjacent edges of the two semicircular steel supports 12 mm. apart. Some specimens of film which had been tested on the 35 mm. apparatus were cut down to 16 mm. The results showed that these specimens burnt to a
length less than that on the 35 mm. apparatus. This result was to be expected since the flame was much smaller and the heating by convection and radiation was therefore considerably reduced. When the flame died out, the angle of the film (to the vertical) at that point, was noted and the second apparatus was altered so that this angle was obtained at a distance equal to the distance of spread on the 35 mm. test. In this way it was found that the diameter of the semicircle should be