6. Preparation of Specimens
6.1 Apply the materials under test to panels of the composition
and surface condition on which it is desired to determine
adhesion. The panel material (6.1.1), surface preparation,
thickness, and number of coats shall be specified or agreed
upon by the seller and the purchaser. Apply uniform coatings
and air dry or bake under conditions of humidity and temperature
mutually agreeable to the seller and purchaser. Either mask
the panel or remove material after application, so that 13 mm
(1⁄2 in.) at one end of the panel is uncoated.
6.1.1 The surface of the panel must be hard enough that it
will not be damaged by the scraping loop. If no panel material
is specified, use 0.8-mm (0.032-in.) cold-rolled carbon steel
prepared in accordance with Methods B or C of Practice D609.
7. Conditioning and Number of Tests
7.1 Condition the test panels for at least 48 h at 23 6 2°C
(73.5 6 3.5°F) and 50 6 5 % relative humidity, and test in the
same environment, or immediately on removal therefrom,
unless otherwise specified or agreed by the seller and the
purchaser. Test at least two replicate specimens of each
material.