Last night I ordered what I thought was a silicone demisphere mold to cook and form meringue. Today, upon receiving the package, I discovered it was not silicone, but acrylic, for chocolate work. It is no issue to return, but I wonder if it would still be possible to use for the meringues, and could it withstand a heat of 160F? If so, what would be best to line the molds with to prevent sticking? Thanks.
Molds in question: