However, some literature as well as reports from some surgical mask manufacturers have shown that blue surgical masks might include traces of formaldehyde and bronopol. It is not common practice for surgical masks to be manufactured using formaldehyde. Blue surgical masks can also be made of polystyrene, polycarbonate, polyethylene, or polyester- all of which are types of fabrics derived from thermoplastic polymers. The material most commonly used to make these masks is polypropylene-a type of fabric made from a “thermoplastic” polymer (meaning that it’s easy to work with and shape at high temperatures). Blue surgical face masks are made with non-woven fabric, which has been shown to have better bacteria filtration and airflow than woven cloth.
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