According to Deccan Herald,  researchers from IISs have developed low-cost virucidal composite mask that offers the same level of protection as N95 masks which are in short supply.

The team from the Department of Material Engineering at the Indian Institute of Science (IISc)  led by associate professors Kaushik Chatterjee and Suryasarathi Bose and three PhD students  have developed the masks and believe that the three-layer design offers greater protection.

While the outer layer of the mask is made of polyester fabric with hydrophobic qualities to deflect water droplets containing the viruses, the central nanofibrous membrane is a fine mesh of a positively charged polymer that defeats bacterial viral agents. The inner cotton layer is for the user’s comfort.
The newspaper added that the IISc team were persuaded to take up the project when clinicians at CMC Vellore sought assistance in getting a high-efficacy, low-cost mask. “They suggested that we look into the problem," Dr Chatterjee said, adding that the anti-viral masks available in the market are either expensive or are inefficient in reducing viral transmission. Low cost and effectiveness was our primary concern,” added Dr Bose, explaining that as per their estimates, the materials costs of the mask is Rs 22 per unit and can be used for 8 hours.” The team will transfer the technology to an interested manufacturer.

The mask's three-layer design offers protection from bacterial viral agents.