Datasheet

①
②
③
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623 PHOENIX CONTACT
ASTM E 662
Smoke gas development
Standard ASTM E 662 specifies a procedure
for evaluating the specific optical density of
the smoke (smoke opacity) during an open fire
or a smoldering fire. For this purpose, the
percentage of light transmitted in relation to
the burning chamber volume is observed. A
sample (76 x 76 x maximum 25 mm) is placed
in a smoke density chamber (see figure) as
defined by the NBS (National Bureau of
Standards). The test object is irradiated with a
heat of 2.5 W/cm
2
. The following processes
are then simulated for 20 minutes:
1. Burning with a naked flame
2. Smoldering fire, avoidance of a naked
flame
There are special limit values for the optical
smoke density of both processes that are
recorded after 1.5 and 4 minutes.
a. Specific optical smoke density (Ds1.5) –
limit value 100
b. Specific optical smoke density (Ds4) –
limit value 200
c. Maximum smoke density (Dm) during the
20 minutes
The polyamides used for Phoenix Contact
terminal blocks meet all the requirements of
the Federal Railroad Administration (FRA) of
the US Department of Transportation
according to ASTM E 662.
① Radiant heater
② Flame
③ Plastic sample
NF F 16-101
Behavior in fire
NF F 16-101 describes the behavior in fire
of plastics on the basis of two indices (I and
F). As such, the following tests are
performed: glow-wire test, oxygen index,
smoke gas opacity, smoke gas toxicology.
1. Determination of index I (0 - 4)
Index I is determined from the results of
the glow-wire test and the oxygen index,
using the following table. Here, I 0 is the
best classification and I 4 the worst.
2. Determination of smoke index F (0 - 5)
This is based on the smoke gas opacity
and the smoke gas toxicity. The following
concentrations in [ppm] are considered
critical:
Index Oxygen index Glow wire
I 0 70% 960°C, no flame formation
I1 45% 960°C, no flame formation
I 2 32% 960°C, no flame formation
I3 28% 850°C, no flame formation
I 4 20% 850°C, flame extinguishes quickly
Carbon monoxide (CO) . . . . . . . . . . .1750
Carbon dioxide (CO
2
) . . . . . . . . . . .90,000
Hydrochloric acid (HCl) . . . . . . . . . . . . .150
Hydrobromic acid (HBr) . . . . . . . . . . . 170
Hydrocyanic acid (HCN) . . . . . . . . . . . . .55
Hydrofluoric acid (HF) . . . . .. . . . . . . . . . .17
Sulfur dioxide (SO
2
) . . . . . . . . . . . . . . 260
Using the test results, a smoke index is
documented and can be assigned to classes
F 0 - F 5 depending on the value. Here, F 0
is the best classification and F 5 the worst.
Terminal blocks from Phoenix Contact
attain classification I 2/F 2.
SMP 800-C
Smoke gas toxicity
SMP 800 C describes the maximum
permissible values of toxic smoke gases when
a plastic is burned. In comparison with BSS
7239 (Boeing standard), this standard specifies
more precise measuring methods for the
qualitative and quantitative determination of
toxic smoke gases that result when a test
object is completely burned. The smoke gases
of these measurements are taken from the
NBS test chamber of the ASTM E 662 test.
The same time scheme is valid here as in
ASTM E 662.
Data is recorded over a full 20 minutes.
SMP 800-C limit values of toxic smoke
gases in ppm:
Carbon monoxide (CO) . . . . . . . . .3500
Carbon dioxide (CO
2
) . . . . .. . . . .90,000
Nitrogen oxides (NO
X
) . . . . . . . . . . .100
Sulfur dioxide (SO
2
) . . . . . . . . . . . . .100
Hydrochloric acid (HCl) . . . . . . . . . . .500
Hydrobromic acid (HBr) . . . . . . . . . .100
Hydrofluoric acid (HF) . . . . . . . . . . . .100
Hydrocyanic acid (HCN) . . .. . . . . . . .100
The polyamides used by Phoenix
Contact are many times below the critical
concentrations.
0 1.5 4 t
min
20
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