To provide a light airproof skin for lifting and control surfaces.

"Catalog 'em, put 'em in airproof bags.

CHAPTER TWENTY The sun was high and the air was still and the heat lay over the twenty-five-acre concert site like an airproof iron blanket.

Your argon blanket is not going to be air-proof enough to prevent ignition of hydrogen gas produced by the reaction of sodium with oxygen and/or water.

The sides of the surfaces are joined by a flexible and air-proof material such as leather; the surfaces and joining material comprise a bag sealed everywhere but at the nozzle.