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January 2001 - ASTM B117 Salt Fog Testing Method.
Cold rolled steel (CRS) panels were scribed to expose the
underlying metal and placed in a certified salt spray cabinet
for 1,000 straight hours (approx. 42 days.) Failure is determined
by corrosion undercutting 1/8" from the scribe area
or any visible blistering or delaminating of the finish anywhere
on the test panel.
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| Test Panel "A" |
Test Panel "B" |
Test Panel "C" |
Test Panel "A" - This panel was pre-treated in
our batch system with Fremont 626 cleaner phosphate heated to 140
degrees Fahrenheit and rinsed with De-ionized water. It was dried
in our oven and coated with DuPont's Almond TGIC Polyester #PFT-500-S8
Top Coat.
Test Panel "B" - This panel was pre-treated in
our batch system with Fremont 626 cleaner phosphate heated to 140
degrees Fahrenheit and rinsed with De-ionized water. It was dried
in our oven, coated with Morton's Zinc-Rich Epoxy Primer and then
coated with Spraylat's RAL Hybrid High Gloss Structure #PRHS86221
Top Coat.
Test Panel "C" - This panel was sand-blasted,
pre-treated in our batch system with Fremont 626 cleaner phosphate
heated to 140 degrees Fahrenheit and rinsed with De-ionized water.
It was dried in our oven, coated with Morton's Zinc-Rich Epoxy
Primer and then coated with DuPont's Almond TGIC Polyester #PFT-500-S8
Top Coat.
Conclusion - All three test panels passed the Salt Spray
Test, but look a the difference! Sand-blast, Zinc-Rich Primer and
Top Coat clearly offers the most corrosion resistance.
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