SPECIFICATION RW-3037 ISSUE 2 Page 3
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4.3.1 Dimensions and Longitudinal Change
Measure three 6 inch (152 mm) specimens of tubing, as supplied, for length ± 1/32 inch (± 1 mm) and inside
diameter in accordance with ASTM D 2671. Condition these specimens for 10 minutes in a
200 ± 5°C (392 ± 9°F) oven or equivalent, cool to 23 ± 3°C (73 ± 5°F) and then remeasure. Calculate
longitudinal change 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)]
Alternatively, measure the dimensions in accordance with IEC 60684-2 clause 3 and longitudinal change in
accordance with IEC 60684-2 clause 9
4.3.2 Tensile Strength, Tensile Stress and Elongation
Test three specimens of tubing for tensile strength, tensile stress (stress modulus) and elongation in
accordance with ASTM D 2671, or IEC 60684-2 clause 19. For tubing sizes 3/8 and smaller, the specimens
shall be full sections of tubing; for sizes 1/2 and larger, the specimens shall be cut with die D of ASTM D
412, or type 2 ISO 37. The specimens shall have 1 inch (25 mm) bench marks, centrally located. The testing
machine shall have an initial jaw separation of 1 inch (25 mm) for full sections of tubing and 2 inches (51
mm) for die-cut specimens. The rate of jaw separation shall be 20 ± 2 inches (500 ± 50 mm) per minute.
4.3.3 Low Temperature Flexibility
Condition three specimens, each 12 inches (305 mm) in length with the appropriate size mandrel at – 55 ± 3°C
for 4 hours and test in accordance with IEC 60684-2 clause 14.
For strips, the mandrel shall be no more than 10 times the wall thickness. Full section tubing is tested unfilled
and the mandrel shall be no more than 10 times the outer diameter.
4.3.4 Heat Shock
Condition three 6 inch (152 mm) specimens of tubing for 4 hours in a 300 ± 5°C (572 ± 9°F) oven. After
conditioning, remove the specimens from the oven, cool to room temperature and bend through 180 degrees
in 2 to 4 seconds over a mandrel selected in accordance with Table 3. Visually examine the specimens for
evidence of dripping, flowing or cracking. Any side-cracking caused by flattening of the specimen on the
mandrel shall not constitute failure.
4.3.5 Heat Resistance
Condition three 6 inch (152 mm) specimens of tubing, prepared in accordance with 4.3.2, for
168 hours in a 250 ± 3°C (482 ± 5°F) oven that meets the requirements of IEC 60216-4-1 or ASTM D5423,
Type 1. After conditioning, remove the specimens from the oven, cool to room temperature and test for
ultimate elongation in accordance with 4.3.2.
