Inflammability classification
UL 94
UL 94 describes inflammability tests that
have gained particular importance in the
field of electrotechnology. Behavior in
fire is the main focus. Items are classified
according to either UL 94 HB (Horizontal
Burn) or UL 94 V (Vertical Burn). The
test setup is such that the 94 V0/1/2
classifications are stricter than the 94 HB
classification.
UL 94 V0/1/2
After conditioning, the test bar is
vertically clamped and flame-treated
several times for 10 seconds each.
Between the flame treatments, the time until
the test bar is extinguished is measured. The
afterglow time and dripping properties are
then assessed.
The performance of the test as per this
standard is not suitable for foils and/or
very thin test objects that shrink under the
thermal aging of the flame.
The plastic used for Phoenix Contact
products fulfills the higher-grade criteria.
Test setup in
acc. with
UL 94
Classification
Burning time after each flame treatment
Total burning time after 10 flame treatments
Glowing time after the 2nd flame treatment
Complete burn-off
Inflammation of the absorbent cotton under the sample
UL 94 V0
≤ 10 s
≤ 50 s
≤ 30 s
UL 94 V1
≤ 30 s
≤ 250 s
≤ 60 s
UL 94 V2
≤ 30 s
≤ 250 s
≤ 60 s
UL 94 HB
No
No
No
No
No
Yes
–
–
–
Yes
–
Halogen-free protection against flames
DIN EN ISO 1043-4
Halogens are the chemical elements
astatine, fluorine, chlorine, bromine and
iodine. One characteristic of the halogen
compounds of bromine and chlorine
relates to the reduction in the degree
of inflammability when plastics are used.
In the event of fire, poisonous corrosive
gases are formed, which can also lead
to secondary damage as a result of the
extinguishing water. For this reason,
Phoenix Contact does not use any
flame protection agents which contain
halogen or other additives. Polyamide,
polycarbonate, polycarbonate/acrylnitrile
butadiene styrene, acrylnitrile butadiene
styrene, and polyolefins feature halogen-
free flame protection systems.
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