| Simulate the
thermal stress which may be produced by heat or ignition
sources (incandescent elements or overloaded resistors
for short periods) to be able to access the danger of
starting fire |
Any flame must
stop within 30 sec. after removinf the incandescent wire
TEST TEMPERATURES
- 650 °C
- 750 °C
- 850 °C
- 960 °C
Falling burning drops do
not set fire to the tissute paper
|
Heat sources
4 mm diameter incandescent wire
Duration of the test
Wire applied for 30 sec.
Characteristic elements
Extinguishing time of the flame
|
| Simulate the
effect of small flames which may accur in a malfuction
condition within the products with the aim of judge the
risk of fire |
the sample
does not catch fire
the flame and the incandescent
perticles do not propagate fire
the duration of combustion
is less tha 30 sec after removing the Bunsen burner
|
Heat sources
Flame from a Bunsen burner
Duration of the test
Flame applied for 5, 10, 20, 30, 60, 120 sec according
to the specific standard
Characteristic elements
The degree of severity: flame application time (AT)
|
| Supply a classification
of the various behaviors which the materials may after
contact with the falme form a Bunsen burner |
V0
if the specimen burns on average for less than 5 sec before
self-extinguishing
V1
if it burns on average for less than 25 sec.
V2
if it burns for less than 25 sec with incandescent drips
HB
if it burns for more than 25 sec (specimen horizontal
and combustion velocity less than 38 mm/min.
Assimilated to ASTM D-635
|
Heat sources
Flame from a Bunsen burner
Duration of the test
Flame applied for 10 sec twice in a row
Characteristic elements
Duration of combution
|
