UV rating of an epoxy coating?
UV rating of an epoxy coating?
(OP)
Is there a standard test to rate the performace of an epoxy coating that is designed to be a UV protection coating? I found companies that rate their own coating as " good UV protection" but what does that mean?
We use a coating as a sacrificial part of the system and it contains pigments to block the sun. Weather and erosion knock the chalked surface loose and affect the life of the coating. We monitor the coating and when it gets thin, we re-coat.
But how is the effectiveness of the UV protection measured?
I thought it either blocked the sun or it didn't. Is there a test to rate these coating systems?
We use a coating as a sacrificial part of the system and it contains pigments to block the sun. Weather and erosion knock the chalked surface loose and affect the life of the coating. We monitor the coating and when it gets thin, we re-coat.
But how is the effectiveness of the UV protection measured?
I thought it either blocked the sun or it didn't. Is there a test to rate these coating systems?





RE: UV rating of an epoxy coating?
http://www.astm.org/Standard/index.shtml
http://www.iso.org/iso/home.htm
RE: UV rating of an epoxy coating?
Instantaneously, yes. However, UV light is more energetic than its visible counterpart, and anything organic will ge degraded over time with UV exposure. That's why testing is more about lifetime than instantaneous efficacy.
The fact that you described your coating as "sacrificial" demonstrates the intent of the coating is to absorb and block the UV damage with something that can be allowed to be degraded to protect something that is not allowed to be degraded.
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: UV rating of an epoxy coating?
RE: UV rating of an epoxy coating?
Steve Jones
Materials & Corrosion Engineer
http://www.linkedin.com/pub/8/83b/b04
RE: UV rating of an epoxy coating?
TTFN
FAQ731-376: Eng-Tips.com Forum Policies