...The outer part is a thincoating of loose threads: the inner is tough paper, impervious web, justlike that which forms the wasps' hive, but stronger... 
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...Add to this thethickness of the skin itself, and the combination forms a covering thatis almost impervious to cold...
William T. Hornaday 「The Extermination of the American Bison」
...It is often as much as half an inchthrough, of great hardness, and as far as I can see impervious toair and light...
J. Emerson Tennent 「Sketches of the Natural History of Ceylon」
...Another point to be guarded against is the supply ofwater that has drained from marshes or impervious soils, rich in organicmatter, as such water is charged with nitrites, ptomaines, etc...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Its silky plumage is impervious to wet; and hence when the bird returns to the surface, the pearly drops which roll off into the stream are the only evidence of its recent submersion...
John Ruskin 「Love's Meinie」
...Butwhere the surface is impervious and smooth, as in the case of metallicsurfaces, a priming coat is not applied...
William N. Brown 「Handbook on Japanning: 2nd Edition」
...The slight bodies of the Xoranians seemed as impervious to bullets and missiles as though armor-plated...
Various 「Astounding Stories of Super-Science January 1931」
...The light-beam seemed impervious to attack...
Raymond King Cummings 「Wandl the Invader」
...But that planetwas almost impervious to the illuminatingrays of the sun and wasbarely discernible...
Donald Wandrei 「Raiders of the Universes」
...That this opinion comes neerer to the truth thanthat common one of Aristotle which hath to no purpose filled theheavens with such reall and impervious Orbes...
John Wilkins 「The Discovery of a World in the Moone」
...The water is no doubt permanent, forit is supplied by the drainage of the sandhills that surround it, and itrests on a substratum of impervious clay...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
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