On the TDA2050 the tab is connected to pin 3 (-Vs). Because the chip uses a split supply and you don't want to risk the heat sink grounding the -VS supply you will need an insulator underneath the chip. Mica is the traditional approach with thermal grease applied to BOTH sides of the mica.
However, a better option is a thermal insulating pad. These require no grease and provide a better thermal path than the old mica solution. You can use something like this one
http://www.alliedelec.com/search/productdetail.aspx?SKU=70215877#tab=specs. They are easy to work with and give excellent results. I use then exclusively in place of the old mica insulators.
In any event do NOT attempt to use a plastic separator. Plastic is not a very good thermal conductor and you'll end up burning out your amplifier chip.
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