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The next mechanical test performed was the Mandrel Bend Test, ASTM
D522. This important stress test gives the design engineer a predictive
indicator of a coatings performance. Original specimens of the Rust Bullet® panel
(number 2), the Wasser® panel (number 6), and the POR-15® panel
(number 8) were evaluated for flexibility of the coating in accordance
with the procedures set forth in ASTM D522, method B. The panels were
bent 180 degrees around a 3/8 inch steel mandrel and the condition of
the coating at the “bend site” was visually examined and
evaluated.
At a 12% elongation of the respective coatings, Wasser® Brand
System (panel number 6), and POR-15® System (panel number 8) exhibited
cracking of the film. At a 12% elongation of the coating Rust Bullet® (panel
number 2) did not exhibit any cracking or disbonding of the film.
Printed from National
Testing Standards, Inc., Certificate:
“Test No. 6:
Method: Original specimens of panels 2, 6, and 8 were
evaluated for flexibility of the coating in accordance with the procedures
set forth in ASTM D-522 method B using a 3/8” mandrel.
Results: At a 12% elongation of the respective coatings, panels
6 and 8 exhibited cracking of the film. At a 12% elongation of the coating
panel 2 did not exhibited any cracking or disbonding of the film.”
(Report No.27935R2
National Testing Standards, Inc.)
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