Parchment paper does not scorch, at least not on the cotton setting (about 325º) in months of use for fusing. It does scorch in the oven on about the third batch of cookies, however. :lol: You can also use parchment paper to add a paper backing to fusibles without one, like Misty Fuse.
The release paper, btw, can be used to transfer drawn lines directly onto fusible once it's on fabric...meaning you do not have to cut out shapes with the paper still on the fabric. Saves hours of peeling bits of paper off fabric while fraying edges and does not dull your scissors.