Polypropylene fabric melts under a hot iron. What's it called when wet cloth is put over fabric so iron works?

A Hot Iron will melt a polypropylene fabric . If a wet cloth is placed over the fabric and then ironed, what is the cloth called?

I use a portion of a clean cotton sheet and I refer to it as a pressing cloth.

Here is a good link.

It's a pressing cloth. I just dampen a pillow case/slip or cotton tea towel.

The Muse

i dont know

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