Datasheet

60
Flammability
A number of test procedures have been developed which can be used for the
evaluation and comparison of various materials to support combustion.
UL94 Vertical Burning Test
Samples of a material, with dimensions 127mm by 12.7mm and the thickness
of the intended end use product, are tested in an unaged “as manufactured”
state and in an aged state (7 days at 158 °F, 70°C). The test requires the place-
ment of a precisely controlled flame under a vertically supported specimen for a
10 second period. The flame is removed and the duration of flaming is
recorded. If the flame extinguishes, the specimen is immediately subjected to a
second 10 second ignition period. Duration of flaming is again recorded. A piece of surgical cotton is
placed under the specimen. If drips ignite the cotton, this fact is also recorded.
Materials Classed 94V-0
Materials classed 94V-0 shall:
• Not have any specimens which burn with flaming combustion for more than 10 seconds after either application of
the test flame
• Not have a total flaming combustion time exceeding 50 seconds for the 10 flame applications for each set of five
specimens.
• Not have any specimens which burn with flaming or glowing combustion up to the holding clamp.
• Not have any specimens which drip flaming particles that ignite the dry absorbent surgical cotton located 12"
(305mm) below the test specimen.
• Not have any specimens with glowing combustion which persists for more than 30 seconds after the second
removal of the test flame.
Materials Classed 94V-1
Materials classed 94V-1 shall:
• Not have any specimens which burn with flaming combustion for more than 30 seconds after either application of
the test flame.
• Not have a total flaming combustion time exceeding 250 seconds for the 10 flame applications for each set of five
specimens.
• Not have any specimens which burn with flaming or glowing combustion up to the holding clamp.
• Not have any specimens which drip flaming particles that ignite the dry absorbent surgical cotton located 12"
(305mm) below the test specimen.
• Not have any specimens with glowing combustion which persists for more than 60 seconds after the second
removal of the test flame.
Materials Classed 94V-2
• Not have any specimens which burn with flaming combustion for more than 30 seconds after either application of
the test flame
• Not have a total flaming combustion time exceeding 250 seconds for the 10 flame applications for each set of five
specimens.
• Not have any specimens which burn with flaming or glowing combustion up to the holding clamp.
• Be permitted to have specimens that drip flaming particles which burn only briefly, some of which ignite the dry
absorbent surgical cotton placed 12" (305mm) below the test specimen.
• Not have any specimens with glowing combustion which persists for more than 60 seconds after the second
removal of the test flame.
Flammability