Is there such thing as a heat-proof pad to put on top of a mantle, to keep things on top from being affected?

Question:I have a propane fireplace that has a very deep cabinet that it sits in. It makes it perfect for putting things like the TV and so forth on. However, heat can be detrimental in this way - it gets quite warm on top when it runs for a long time - it is the only source of heat in our family room. Is there a thermal pad/heat-proof pad, or some other form of abatement I can use so that I can protect my TV when using the fireplace? Any product website links would be much appreciated, or a description of what you have done similarly. Thanks!

Answers:
The only idea I could come up with is maybe to try a silicone sheet. Have you seen how bakeware and oven mitts are now being made out of silicone and they can withstand temps over 600 degrees? Well, that's where I came up with the idea.

Here's a couple of websites that you may want to look at if you're interested:

http://www.unitedsilicone.com/sheets.htm...
http://www.adlinsulflex.com/fire-blanket...