OP-3 plexiglas

Does anyone have familiarity with the use of OP-3 plexiglas used in
place of UF-5?  Does it have similar or better properties in guarding
against UV exposure?  Thanks,

Ramona

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                  Conservation DistList Instance 12:46
                 Distributed: Monday, November 23, 1998
                       Message Id: cdl-12-46-015
                                  ***