The next device to be used is the Thermal Shock Chamber, ASTM D2337. This is simply a temperature control device in which temperature can be raised or lowered over a controlled period of time. For purposes of our testing, we started with an upper temperature of 160ºF (71ºC), and lowered the temperature to -20ºF (-29ºC). Two cycles were performed, each consisting of 3 hours. This is done to simulate the extreme conditions found in nature and as a means of inducing coating failure.

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Results:

None of the coated test panels exhibited any visible evidence of coating degradation. The uncoated control panel exhibited additional surface rusting.

Printed from National Testing Standards, Inc., Certificate:

Test No. 2:

Method: After accelerated weathering all ten of the submitted test panels were thermal cycled (ASTM D-2337) between 160°F and –20°F. Two cycles were performed each consisting of 3 hours.
Results: None of the coated test panels exhibited any visible evidence of coating degradation. The uncoated control panel exhibited additional surface rusting.”

(Report No.27935R2 National Testing Standards, Inc.)