From By Annie’s.
Lightweight and breathable, this top-quality filtering material is perfect for face masks.
- Non-woven spun-bond polypropylene
- 1.25 ounce per square yard (on par with most surgical masks)
- 20 inches wide
- Washing: Machine Wash/Tumble Dry
They recommend using this filter material in conjunction with tightly-woven quilting cottons for a stylish design and good quality filtration.
This material has a melting point of approximately 320℉. Do NOT use iron directly on the mask filter material. If you must iron your project, be sure to use a low heat setting and a pressing sheet or other heat barrier.