SPECIFICATION RT-1323 ISSUE 1 Page 3
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4.3.4 Low Temperature Flexibility
Three 6 x 1/4 inch (152 x 6.3 mm) specimens cut from a slab shall be conditioned, along with a
3-inch (75-mm) mandrel, in a cold chamber at -20 ± 2°C (-4 ± 4°F) for 4 hours. After completion of the
conditioning, and while still in the cold chamber, each specimen shall be bent around the mandrel through not
less than 360 degrees within 10 ± 2 seconds. The specimens then shall be visually examined for cracks.
4.3.5 Heat Shock
Three 6 x 1/4 inch (152 x 6.3 mm) specimens cut from a molded slab shall be conditioned for 4 hours in a 225
± 5°C (437 ± 9°F) mechanical convection oven with an air velocity of 100 to 200 feet
(30 to 60 m) per minute past the specimens. After conditioning, the specimens shall be removed from the
oven, cooled to room temperature, and then shall be visually examined for evidence of dripping, flowing, or
cracking.
4.3.6 Heat Aging
Three specimens prepared and measured in accordance with 4.3.2, shall be conditioned for
168 hours in a 150 ± 3°C (302 ± 5°F) mechanical convection oven in which air passes the specimens at a
velocity of 100 to 200 feet (30 to 60 m) per minute. After conditioning, the specimens shall be removed from
the oven, cooled to room temperature, and tested for tensile strength and ultimate elongation in accordance
with 4.3.2.
4.3.7 Fluid Resistance
Three specimens prepared in accordance with 4.3.2, shall be completely immersed in each of the fluids listed
in the applicable section of Table 1 for 24 hours at the specified temperature. The volume of the fluid shall
be not less than 20 times that of the specimens. After conditioning, the specimens shall be lightly wiped and
air dried for 30 to 60 minutes at room temperature. The specimens then shall be tested for tensile strength
and ultimate elongation in accordance with 4.3.2.
4.3.8 Oxygen Index at Elevated Temperature
Determine the oxygen index using the apparatus described in ASTM D 2863 with the exception of a special
double wall glass chimney replacing the standard chimney. This chimney must be equipped with a heating
element and temperature controller capable of maintaining the temperature of the gas atmosphere in the
chimney to ± 2°C (± 4°F).
With the gas supply regulated to 21% oxygen content, determine the temperature, within 10°C (18°F), at
which the specimen will burn 3 minutes or 2 inches (50 mm), whichever occurs first, using the endpoint
criteria of ASTM D 2863. Report this temperature as the oxygen index at elevated temperature.
4.4 REJECTION AND RETEST
Failure of any samples to comply with any one of the requirements of this specification shall be cause for
rejection of the lot represented. Material which has been rejected may be replaced or reworked to correct the
defect and then resubmitted for acceptance. Before resubmitting, full particulars concerning the rejection and
the action taken to correct the defect shall be furnished to the inspector.
5. PREPARATION FOR DELIVERY
5.1 PACKAGING
If not specified, packaging of molded components shall be in accordance with good commercial practice.
The exterior shipping container shall be not less than 125 pound-test fiberboard.
5.2 MARKING
Each molded component shall be distinctly identified on the part and/or package with the manufacturer's
name or symbol, the manufacturer's part number, and lot number.
