The phrase "a mask against" is correct and usable in written English.
It can be used to describe something that serves as a protective barrier or defense against a particular threat or issue.
Example: "The new policy acts as a mask against potential data breaches, ensuring our information remains secure."
Alternatives: "a shield against" or "a barrier to".
One wears a hood, the other a mask; one against a white background, the other black.
A skinny young man — equipped with a ski mask against police pepper spray, and shivering from cold or adrenaline — harangued the police while holding up a flyer for "Zeitgeist: Addendum," the sequel to a loopy but slick online documentary, made in America, that endorses familiar secret-government conspiracy theories (9/11 an inside job, and so on) while arranging them in a vaguely Marxist setting.
Studies have shown that in such circumstances increased numbers of surgical masks are worn, but the protection afforded to the wearer by a surgical mask against infectious aerosols is not well understood.
The formation of the protrusive nanostructures (hillocks) was ascribed to the difference in etching rate of the scratched area and original silicon surface, where the scratched area acted as a resist mask against etching [11, 12].
The following 30 min lift-off process with EKC-830 (Dupont Electonic Technologies, Hayward, CA) at 80°C left Cr pattern as an etching mask against the subsequent reactive ion etching to transfer the Cr patterns into the underlying silicon substrate under conditions of 25 sccm of CHF3, 2 sccm of O2, 20 mTorr and a RF power of 100 W for 200 s.
The kit should include such items as a first aid kit, food and water supplies, a mask to protect against ash such as one used when mowing lawns, a manual can opener, a flashlight with extra batteries or preferably a crank model, any necessary medications, sturdy shoes, goggles or other eye protection, and a battery-powered radio.
They are a breach of our democracy," he said, holding a mask to his face against the fumes.
Another demonstrator, wearing a white face mask against tear gas, was Vassilis Stathousis, the president of the rail workers union, who said he expected the bill to be passed by parliament though onlybarely.
She was wearing a white outfit with a mask and gloves to protect against contamination.
