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September, 1952
WCKARD AND HIRD '. FLAMMABILITY OF SAFETY FILM
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mounted on an insulating base between the two steel supports at one end of the semicircle. The film was held in position by two steel strips passing over the semicircular supports.
The method of testing was identical with that already described for the 35 mm. film. 0.3 c.c. of alcohol were used as the igniting source and the distance the film burnt was noted.
Six specimens of each type of film were tested, the results are given in Table II.
Tests on other Cellulosic Materials
In order to compare the hazard of safety film with other cellulosic materials in the same form, specimens of nitrate film, newsprint, cartridge paper, cotton and rayon were subjected to the same test in both 35 mm. and 16 mm. widths. Six specimens of each material were tested and the results are shown in Tables III and IV.
Discussion of Results
Rayon appears to be more hazardous than
Table III
Distance of Spread of Flame on Cellulosic Materials 35 mm. in Width
Specimen
Thickness in. x 103
Mean distance of flame spread in.
Nitrate film — emulsion coated
5.9
Still burning at 21 in.
Newsprint — I (1.15 x 10-3 oz/sq. in.)
2.9
17
Newsprint — II
(1.21 x 10-3 oz/sq. in.)
3.5
Still burning at 21 in.
Cartridge paper (3.32 x 10-3 oz/sq. in.)
7.6
19.5
Cotton print (2.77 x 10-3 oz/sq. in.)
8.6
Still burning at 21 in.
Rayon (3.86 x 10-3 oz/sq. in. )
5.0
Still burning at 21 in.
Table IV
Distance of Spread of Flame on Cellulosic Materials 16 mm. in Width
Specimen
Thickness in. x 10:<
Mean distance of flame spread in.
Nitrate film — emulsion coated
5.9
Still burning at 27 in.
Newsprint — I
(1.15 x 10-3 oz/sq. in.)
2.9
19
Newsprint — II (1.21 x 10-3 oz/sq. in.)
3.5
Still burning at 27 in.
Cartridge paper
(3.32 x 10-3 oz/sq. in.)
7.6
19
Cotton print (2.77 x 10-3 oz/sq. in.)
8.6
Still burning at 27 in.
Rayon (3.86 x 10-3 oz/sq in )
5.0
20.5