Page 2 SPECIFICATION RT-1006 ISSUE 2
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4.3.1.1 Assembly of Specimens
For each adhesive specimen, a 6-inch length of neoprene tubing shall be recovered on a glass-
laminated plastic mandrel or a metal tube 1 inch in diameter. Heat shall be applied with a HG-501A
Thermogun equipped with a A-170-HG reflector and operating at 288 - 343° C (550 - 650 °F).
The recovered tubing then shall be cooled to 25 ± 3° C (77 ± 5° F). After cooling. the outside of
the recovered tubing and the insides of three 1 ½ inch lengths of expanded polyolefin tubing shall
be lightly abraded with No. 320 emery cloth and wiped with a clean cloth or paper towel wet with
methyl propyl ketone. Three grams of adhesive then shall be evenly spread approximately 0.020
inch thick on the recovered tubing except that a 3/4-inch space the length of the tubing shall be
uncoated. The three lengths of polyolefin tubing then shall be placed over the adhesive-coated
tubing and shall be recovered as described above. Heat shall be continued for 30 seconds after the
tubing recovers. This assembly (Figure lA) shall be cured for 45 minutes in an oven maintained at
121 ± 3° C (250 ± 5° F). After cooling to approximately 110° C (230° F) the tubing shall be cut
along one edge of the adhesive-free area, removed from the mandrel, and flattened between
6- x 3 1/4-inch metal plates to form a slab (Figure lB). This slab shall be cooled for 1 hour at
25 ± 3° C (77 ± 5°F). A specimen one inch wide (Figure lC) then shall be cut from the center of
each double thickness.
4.3.1.2 Procedure
The unbonded ends of each specimen shall be inserted in the jaws of a tensile tester which shall be
operated at a jaw-separation speed of 2 inches per minute. Readings of peel strength shall be taken
at every 1/2 inch of jaw separation after 1 inch initial separation. The average of five readings
shall define peel strength.
4.3.2 Flow
4.3.2.1 Room Temperature
Three grams of mixed adhesive shall be formed into a compact mass about 1/2 inch high and 1 inch
in diameter on a smooth glass surface that has been cleaned with methyl propyl ketone.
At 25 ± 3°C (77 ± 5 °F), the glass shall be placed on edge and shall be marked on a line tangent to the
bottom edge of the adhesive. After 10 minutes, the glass again shall be marked on a line tangent to the
bottom edge of the adhesive and the distance between marked lines shall be measured.
4.3.2.2 Cure Temperature
Following the test of 4. 3. 2. 1, the glass shall be mounted vertically in an oven at 121 ± 3°C (250 ± 5°F).
After 10 minutes, the glass again shall be marked on a line tangent to the bottom edge of the adhesive
and the distance between the second and third lines shall be measured.
4 .3.3 Dielectric Strength
Two polyethylene films, 6 x 6 x 0.002 inches, shall be coated on one side with a release agent such
as Dow Corning #4 Compound or equivalent. Three grams of mixed adhesive shall be spread on
the coated side of one of these films as a disk from 1 to 3 inches in diameter. The adhesive then
shall be covered with the second coated film and the adhesive and films shall be placed between
6 x 6-inch metal plates. The plates shall be pressed together until the intervening disk of adhesive
is from 0.005 to 0.025 inch thick. This assembly then shall be cured for 2 hours in an oven
maintained at 95 ±3° C (203 ±5°F). After curing, the disk of adhesive shall be removed from the
assembly, cooled to 25 ± 3°C (77 ± 5°F), and tested for dielectric strength in accordance with the
short-time test of ASTM D 149.
4.3.4 Pot Life
Three grams of mixed adhesive shall be conditioned in an uncovered container for 1 hour at
25 ± 3°C (77 ± 5°F). After conditioning, specimens shall be prepared with this adhesive and tested
for peel strength in accordance with 4.3.1.
