SPECIFICATION RT-1301 ISSUE 7 Page 3
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4.2.2 Acceptance Test Samples
Acceptance test samples shall consist of not less than 16 feet (5 m) of tubing selected at random from each
lot. A lot shall consist of all tubing of the same size, from the same production run, and offered for
inspection at the same time.
4.3 TEST PROCEDURES
Unless otherwise specified, tests shall be performed on as-supplied specimens. Prior to all testing, the test
specimens (and measurement gauges, when applicable) shall be conditioned for 3 hours at 23 ± 3 °C (73 ± 5
°F) and 50 ± 5 percent relative humidity. All ovens shall be of the mechanical-convection type in which air
passes the specimens at a velocity of 100 to 200 feet per minute.
4.3.1 Dimensions
Three 6-inch (150 mm) specimens of tubing shall be measured for inside diameter in accordance with ASTM
D 876. The specimens then shall be placed on mandrels and conditioned for 10 minutes in a 200 ± 3 °C (392
±5 °F) oven. The diameter of the mandrels shall equal the maximum inside diameter of the recovered tubing
as specified in Table 1, plus 0.000, minus 0.002 inch or 2 percent, whichever is greater. After conditioning,
the specimens, while still on the mandrels, shall be removed from the oven, cooled for at least 30 seconds in
water at less than 35 °C (95 °F), and inspected for wall thickness in accordance with ASTM D 876. If air
space is visible between the specimen and the mandrel, the specimen shall be removed from the mandrel,
measured for inside diameter and inspected for wall thickness in accordance with ASTM D 876.
4.3.2 Longitudinal Change
Three 6-inch specimens of tubing shall be measured for length to an accuracy of ± 1/32 inch. The specimens
then shall be conditioned on aluminum foil for 3 minutes in a 200 ± 3 °C (392 ± 5 °F) oven. After
conditioning, the specimens shall be removed from the oven, cooled to 23 ± 3 °C (73 ± 5 °F), and
remeasured. The longitudinal change shall be calculated as follows:
C =
L
1
- L
0
L
0
X 100
Where: C = Longitudinal Change (Percent)
L
0
= Length Before Conditioning (Inches) (mm)
L
1
= Length After Conditioning (Inches (mm)
4.3.3 Flow of Inner Wall
Three 6-inch specimens of tubing shall be conditioned on aluminum foil for 3 minutes in a 200 ± 3 °C
(392 ± 5 °F) oven. After conditioning, the specimens shall be removed from the oven and, within 5 seconds,
approximately 1/4 inch of one end of each specimen shall be lightly pressed together using a pair of needle-
nose pliers. The pressure shall be sufficient to completely close the opening
and shall be applied for 20 to 40 seconds. The specimens then shall be removed from the pliers, cooled to
23 ± 3 °C (73 ± 5 °F), and maintained at that temperature for 10 minutes. The specimens then shall be
replaced in the 200 ± 3 °C (392 ± 5 °F) oven for 5 minutes. After conditioning, the specimens shall be
removed from the oven, cooled to 23 ± 3 °C (73 ± 5 °F) and examined for openings in the pressed or sealed
area.
