Canada's top doctor recommends a three-layer mask, with the middle layer being a polypropylene filter material. This is a thin, non-woven interfacing-like fabric with moisture-wicking properties.
White, 45cm (18") wide
The I-LINE 150 is a 1.5 oz Polypropylene made from spun bonded fibres. The Spun Bond makes the product washable, but it still should only be washed in cold
and air dried. No hot dryer. No direct IRON as it will melt. Use a drop/pressing cloth between the iron and the polypropylene.
The Canadian government tested several Polypropylene
products and this brand, Veratex, rated the highest at filtering droplets (for non-medical materials).
Polypropylene is now the top material recommended for COVID-19 mask filters, as recommended by Health Canada. Note, this is a non-medical grade product.
Advantages of I-Line 150:
1. Main benefit is strength
2. Formaldehyde free
3. Mold resistant
4. Hydrophobic (water resistance)