Method and Results
Method:
The final mechanical test
was the Impact Resistance Test, ASTM D2794. In a perfect world,
coatings would not suffer physical damage. In the real world,
accidents happen, tools are dropped, doors get slammed, and
other mishaps occur which can damage a coating. The Impact Resistance
Test is a rapid deformation procedure that will defeat all but
the best coatings. A ½ inch steel ball is dropped from
a predetermined height (in this instance 24 inches) onto a steel
panel with the test coating applied to the underneath side.
All panels are the same steel type and the same thickness. After
impact, the bulge on the coated side of the panel is examined
for coating damage and separation from the steel underneath
the coating. Original specimens of Rust Bullet® (panel number
2), Wasser® Brand System (panel number 6), and POR-15®
System (panel number 8) were evaluated for chip resistance. |
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Results:
The Wasser® Brand System panel (number 6) and the POR-15® System panel (number 8) exhibited cracking of the respective paint film at the 24 inch pound level of impact. The Rust Bullet® panel (number 2) exhibited cracking of the paint film at the 28 inch pound level of impact.
Printed from National
Testing Standards, Inc., Report:
“Test No. 7:
Method: Original specimens of panels 2, 6,
and 8 were evaluated for chip resistance by the rapid deformation
procedure (ASTM D-2794).
Results: Panels 6 and 8 exhibited cracking of the respective paint
film at the 24 inch pound level of impact. Panel 2 exhibited cracking
of the paint film at the 28 inch pound level of impact.”
(Report No.27935R2 National Testing Standards, Inc.)
Please visit the
National Testing Standards Website:
http://www.nationaltestingstandards.com/
