They have little or no shrinkage & will not ravel. They can be washed or dry-cleaned. Other types of Pellon® interfacings are woven, knitted or weft-inserted. Interfacing may also be fusible or sew-in.

Should you wash interfacing before sewing?

Before You Cut! Interfacing should be prewashed in the same way as your fabric. ... Prewash your interfacing as you do your fabric. If you don't, when you do launder your completed project, you will find that your fabric and your interfacing shrink different amounts leading to bubbles and warping that can't be ironed out.

Can you wash masks with interfacing?

What about non woven interfacing for face masks. Yes, all non woven materials are very good for filtering small particles. There are not many non-woven materials, aide from interfacing, which can be washed and reused.