PN-EN 60695-11-20 UL 94
Laboratory
IGNITABILITY
TEST OF MATERIALS AND PRODUCTS WITH 500 W THERMAL POWER
FLAME TEST METHODS
ACCORDING PN-EN
60695-11-20
Principle
of the method. Small-scale
laboratory test procedures intended to compare the burning behavior
of different materials used in electrotechnical products when
vertically or horizontally oriented test bar specimens are exposed to
a small flame ignition source with nominal thermal power of 500 W.
The test method uses two test specimen configurations to classify
material performance. Rectangular bar-sharped test specimens are used
to assess ignitability burning behaviour, and square plate test
specimens are used to assess the resistance of the test specimen to
burn-through.
The level
of fire hazard to be determined shall be the classes 5VA and 5VB.
The listed classification is identical with the US classification UL
94: UL 94 5VA and UL 94 5VB because the test is carried out by
identical methods.
Stand for
testing the assessment of ignitability of materials/products with
500 W thermal power flame test methods
The material/product samples are tested in vertical position (method A) and horizontal position (method B). The firing time of the sample is the flame of a gas burner with a thermal power of 500 W for each item 5 times after 5s. During the study the afterflame time t1 and the afterglow time t2 are determined. Note and record any particles or molten drips fall from the test specimen and, if so, they ignite cotton pad.
Test samples.
The test shall be sampled in rectangular bars of a length of 125, 6±5 mm and of a width of 13±0.5 mm and in the form of plates with a length of 150±5 mm and a width of 150±0.5mm with a minimum thickness for the product (preferred thickness: 0.75mm; 1.5mm; 3.0mm; 6.0mm and/or 12mm). The thickness of the sample should not exceed 13mm. Testing for other thicknesses may be performed, provided that this is indicated in the report. The edges of the samples should be smooth and the radius of the edge must not exceed 1.3mm.
To complete the test, 20 samples shall be prepared in the form of rods and 12 samples in the form of tiles.
Classification
The material shall be classified either 5VA or 5VB, in accordance with the criteria indicated in Table 1, based on the behaviour of the bar test specimens and plate test specimens.
|
Criteria | Classification | |
5VA | 5VB | |
|
Afterflame
time plus afterglow time after the fifth flame application fo each
individual bar test specimen | ≤ 60 s | ≤ 60 s |
|
The
cotton pad indicator is ignited by flaming particles or drops from
any bar test specimen | Nie | Nie |
|
Did the
sample burn completely? | Nie | Nie |
|
Have any
plates been through burned? | Nie | Nie |
|
If
the
test results are not in accordance with the specified criteria,
the material cannot be classified by this test method | ||
Applying research methods - civil engineering (electric products)