What is a Surgical mask made of?
What is a Surgical mask made of?
Three layers of polypropylene, of which only the electrostatically charged middle one does the filtering.
Everything effective about a mask is the charge on the meltblown layer, and the charge is fragile. Washing, alcohol spraying, steaming and, in most tests, prolonged heating strip it, leaving a mechanical filter that is far worse than the original — which is why decontamination protocols for respirators had to be validated carefully rather than improvised. The other half of the story is fit: a filter is only as good as the seal around it, which is the entire difference between a loose surgical mask and a fitted FFP2 or N95 respirator, and why facial hair at the seal line matters. Valved respirators protect the wearer but vent unfiltered exhaled air, which is why they were excluded from many source-control requirements.
Component by component
| Part | Material | Why that material |
|---|---|---|
| outer layer | spunbond polypropylene nonwoven | It resists splashes and gives the mask its shape and strength; it filters almost nothing. |
| filter layer | meltblown polypropylene, fibres roughly 1-5 µm across, electrostatically charged | The charge attracts and holds particles far smaller than the gaps between fibres, which is why the mask breathes and still filters. |
| inner layer | a softer spunbond nonwoven | It absorbs moisture from breath and is comfortable against skin, which is the only reason anyone keeps it on. |
| nose wire | aluminium or a plastic-coated wire | Air takes the easiest path; without a nose seal a large share of every breath goes past the filter rather than through it. |
| ear loops | spandex-nylon braid, welded or stapled to the edge | The attachment method is a common failure point, and welded loops hold far better than stapled ones. |
Other medical and personal care objects
- Condom Dipped natural rubber latex, or synthetic polyisoprene or polyurethane for latex allergy — plus silicone lubricant.
- Diaper (nappy) A superabsorbent polymer that holds many times its own weight in fluid, sandwiched between nonwoven plastic layers.
- Contact lens A water-swollen polymer gel — and the whole design problem is getting oxygen through it to the cornea.
- Dental filling Either a mercury-silver amalgam or a light-cured resin packed with glass — and the resin shrinks as it sets.
- Tampon Compressed cotton, rayon or a blend, with a withdrawal cord and either a cardboard or plastic applicator.
- Eyeglass lens Almost never glass — usually CR-39, polycarbonate or a high-index plastic, under several thin coatings.
- Adhesive bandage (plaster) A plastic or fabric backing with pressure-sensitive adhesive, and a pad faced with a film that will not stick to the wound.
- Artificial hip A titanium or cobalt-chrome stem, a ceramic or metal ball, and a crosslinked polyethylene socket liner that is the wear surface.
- Syringe A polypropylene barrel and plunger with a rubber tip seal, and a stainless steel needle on a standard taper.
Common questions
- What is a Surgical mask made of?
- Three layers of polypropylene, of which only the electrostatically charged middle one does the filtering.
- What is the outer layer of a Surgical mask made of?
- Spunbond polypropylene nonwoven. It resists splashes and gives the mask its shape and strength; it filters almost nothing.
- What is the filter layer of a Surgical mask made of?
- Meltblown polypropylene, fibres roughly 1-5 µm across, electrostatically charged. The charge attracts and holds particles far smaller than the gaps between fibres, which is why the mask breathes and still filters.
Related pages
- Condom Dipped natural rubber latex, or synthetic polyisoprene or polyurethane for latex allergy — plus silicone lubricant.
- Diaper (nappy) A superabsorbent polymer that holds many times its own weight in fluid, sandwiched between nonwoven plastic layers.
- Contact lens A water-swollen polymer gel — and the whole design problem is getting oxygen through it to the cornea.
- Dental filling Either a mercury-silver amalgam or a light-cured resin packed with glass — and the resin shrinks as it sets.
- Tampon Compressed cotton, rayon or a blend, with a withdrawal cord and either a cardboard or plastic applicator.
- Eyeglass lens Almost never glass — usually CR-39, polycarbonate or a high-index plastic, under several thin coatings.
- Adhesive bandage (plaster) A plastic or fabric backing with pressure-sensitive adhesive, and a pad faced with a film that will not stick to the wound.
- Artificial hip A titanium or cobalt-chrome stem, a ceramic or metal ball, and a crosslinked polyethylene socket liner that is the wear surface.
- Pencil Stationery and paper
- Tennis ball Sport and games
- Banknote Around the house
- Golf ball Sport and games
- Paper Stationery and paper
- Glass Building materials
Sources
- Official vendor product documentation — At One Place