gastight

[gas-tahyt]
adjective
1.
not penetrable by a gas.
2.
not admitting a given gas under a given pressure.

Origin:
1825–35; gas + tight

gastightness, noun
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
gastight (ˈɡæsˌtaɪt)
 
adj
not allowing gas to enter or escape

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
After installation all field erected piping shall be tested and proved gastight
  at maximum operating pressure.
Cleanouts shall be easily accessible and shall be gastight and watertight.
Common walls to other areas of the building shall be gastight.
The structure or portion to be fumigated must be transformed into a gastight
  fumigation enclosure.
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