Page 4 SPECIFICATION RT-1301 ISSUE 7
If this document is printed it becomes uncontrolled. Check for the latest revision.
4.3.4 Tensile Strength and Ultimate Elongation
Three specimens shall be tested for tensile strength and ultimate elongation in accordance with ASTM D 638
using cross head speed of 2-inches per minute, 1-inch bench marks and an initial jaw separation of 2 inches.
For sizes 3/8 and smaller, the specimens shall be full sections of tubing. For sizes larger than 3/8, the
specimens shall be cut from tubing using die D of ASTM D 412. The die D specimens shall be obtained by
cutting the tubing wall along its entire length, flattening the piece, and applying the die with its long
dimensions parallel to the longitudinal axis of the tubing.
4.3.5 Heat Shock
Three 6-inch (150 mm) specimens of tubing shall be conditioned on aluminum foil for 4 hours in a 250 ± 3°C
(482 ± 5 °F) oven. After conditioning, the specimens shall be removed from the oven, cooled to 23 ± 3°C
(73 ± 5°F) and visually examined for evidence of dripping, flowing, or cracking of the outer wall.
4.3.6 Heat Resistance
Three 6-inch (150-mm) specimens of tubing shall be conditioned on aluminum foil for 168 hours in a
175 ± 2 °C (347 ± 4 °F) oven. After conditioning, the specimens shall be removed from the oven, cooled
to 23 ± 3°C (73 ± 5°F), and bent through 180° over a mandrel selected in accordance with Table 2.
The specimens then shall be visibly examined for evidence of dripping, flowing or cracking of the outer wall.
Any side cracking caused by flattening of the specimen on the mandrel shall not constitute failure.
4.3.7 Dielectric Strength
The dielectric strength of the tubing shall be measured, under oil, in accordance with ASTM D 149.
Five 6-inch specimens of tubing shall be recovered over a metal mandrel by conditioning for 10 minutes
in a 200 ± 3 °C (392 ± 5 °F) oven. The mandrel diameter shall be slightly larger than the recovered inside
diameter of the tubing being tested. The metal mandrel shall serve as one electrode and a 1-inch-wide strip
of lead foil wrapped around the outside of the tubing as the other electrode. Thickness measurements for
calculating dielectric strength shall be made adjacent to the point of breakdown.
4.3.8 Corrosive Effect
4.3.8.1 Copper Mirror Corrosion
Three specimens shall be tested in accordance with ASTM D 2671, Procedure A. The tubing shall be
conditioned for 10 minutes in a 200 ± 3 °C (392 ± 5 °F) oven. For sizes smaller than 3/8, the specimens shall
be 1-inch sections of recovered tubing. For sizes 3/8 and larger, the specimens shall be 1 X 1/4-inch strips
cut longitudinally from recovered tubing. The specimens shall be conditioned for 16 hours at 121 ± 2 °C
(250 ± 4 °F). Evidence of corrosion shall be the removal of copper from the mirror leaving an area of
transparency greater than 5 percent of its total area.
4.3.8.2 Corrosion in Contact with Copper
Three 6-inch specimens of tubing which have been conditioned for 10 minutes in a 200 ± 3 °C (392 ± 5 °F)
oven shall be tested in accordance with ASTM D 2671, Procedure B. The specimens shall be conditioned for
16 hours at 121 ± 2 °C (250 ± 4 °F).
