Answered: Polycarbonate Fresnel Lens

would this polycarbonate Fresnel lens be legal? the thickness is about .020".

i have no idea if it had been “chemically treated, melted or cast.”

To take it further, is it legal to buy a professionally “mechanically altered” legal piece of polycarbonate as long as it was never been “chemically treated, melted or cast during the process?”

Thanks for dealing with all of my nitty gritty questions. We may be doing some cool things with the polycarbonate this year.

It looks like you accidentally asked this question twice. Here’s our answer to the same question posted in another thread.