I think you are talking about protecting your iron and ironing board from the stick of fusible. It's good to know parchment paper will work. If you do buy a sheet of the teflon you just keep reusing it. So even if it seems expensive you use it forever.
I think Holice is talking about FMQ. I bought a silicone oven liner for that, it was much less than the super sliders sold at quilt sites. It's available at hardware stores like Jerry's. I haven't used it yet. Hubby made me an extension table covered with vinyl which is very slippery.