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Physical properties of single-use surgical masks.
| Physical properties | SHM | Standard |
|---|---|---|
| Specific gravity | 0.91 | ASTM D792-20 (2020) |
| Melting point (oC) | 160 | ASTM D7138-16 (2016) |
| Water absorption 24 h (%) | 8.9 | ASTM D570-98 (2018) |
| Tensile strength (MPa) | 4.25 | ASTM D638-14 (2014) |
| Tensile strength at break (MPa) | 3.97 | ASTM D638-14 (2014) |
| Elongation at break (%) | 118.9 | ASTM D638-14 (2014) |
| Rupture force (N) | 19.46 | ASTM D638-14 (2014) |
| Aspect ratio | 24 | – |
