What are N95 Mask Straps Made Of?

The straps of N95 masks are typically made from a combination of materials, including:

Rubber or Elastic
The most common material used for the straps is rubber or elastic. This allows the straps to stretch and conform to the shape of the wearer’s head, creating a secure fit. The rubber or elastic is often a blend of materials, such as polyester and spandex, to provide durability and flexibility.
Polypropylene (PP)
In addition to the straps, N95 masks are primarily made from polypropylene, a synthetic plastic fiber. The mask itself consists of multiple layers of polypropylene, including a melt-blown nonwoven fabric layer that acts as the main filtration material.
Metal
Some N95 masks also include a metal nose clip or bar. This metal component, usually made from aluminum, helps to shape the mask around the nose and cheeks, further enhancing the fit and preventing air leakage.

Repairing Broken Straps

If the straps on an N95 mask become damaged or broken, it’s possible to repair them using 3D-printed parts. These 3D-printed strap replacements are typically made from polylactic acid (PLA), a biodegradable plastic material that can be printed on most FDM (Fused Deposition Modeling) 3D printers5.