It's the glass fibre which degrades, not the polymer. Many, many years ago
the UK Rubber and Plastics Research Association did a series of long-term
weathering tests on a variety of thermoset resins, reinforced with E and A
glass in various forms.
I don't think it ever got to termination, but the A-glass laminates degraded
very quickly. The only way in which you might improve matters is to leach
the alkali out of the fibres with nitric acid, say, to leave a silica
skeleton, then re-treat that with a binding agent.
Thank you, both of you, Terry and Al. I was looking at the HDPE
when I should have been looking at the A-glass. Now that I'm on the
right track, I'm finding many references for this same problem. I'm
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