What types of fabric are heat resistant and can be placed in a microwave oven?

I have this pattern to make a potato bag to cook microwave baked potatoes. I also want to make heating pads.

Any recommendations for both fabric and the heating filler (rice, etc.)? Beans smell and burn a little. The rice is okay but it's heavy.

P.S. Hi, Tammy!

Hi Tammy - I made tortilla warmers that I also use for my baked potatoes out of regular cotton with the cotton batting. I made a sandwich with cotton on both sides of the batting, sewed the two sandwiches together and used bias tape to hide my seams. They came out nicely and I use mine a lot. Hope this helps. Anne

Hi anneob. Thanks for the tip. Do you know if they are microwave proof?

Hello! I did some quick research and found out that Warm and Natural makes a special batting for use in the microwave that has no chemicals added. It is called "Tater Batting," of all things.

How funny! Maybe it was developed just for this purpose. I appreciate the research, Tammy!

Thanks so much. I will look for that at JoAnn's. Of course, now I'm trying not to eat potatoes. Go figure. But I guess I can microwave sweet potatoes since they're healthier, right?

"tater batting" that's awesome!
I've made hot mitts out of regular cotton and quilt batting. But I've never put them in the microwave itself. I doubt anything would happen. You could always test a swatch.

I can see where you'd want to be careful about off-gassing from the chemicals, though.