CDRs and Temperature Again

> CDs are not magnetic media.

Well, yes, I realize that, but that doesn't necessarily mean that they don't require
lower-temperature fire safes than those for paper.

My question ultimately comes down to two things:
1. At what temperature does the plastic of a CDR melt or warp?
2. Can the photochemical reaction used to record a CDR also
be triggered by the unusually high heat of traditional paper-
temperature fire safes, during a house fire? (If I remember
correctly, paper-temperature fire safes regulate the temperature
down to about 350F, whereas those for magnetic media hold
it down to about 150F.)