microporousadj.

1890 New Sydenham Soc. Lexicon Microporous.

1952 Proc. Royal Soc. A. 213 250 The transport of gases in microporous solids has received considerable attention.

1955 Sci. News Let. 29 Jan. 67/1 Oxygen..diffuses through a microporous filter disk made of porcelain and having 800,000,000 holes to the square inch.

1970 Times 22 May 27 At low thicknesses the deposits of chrome thrown by the new method are microporous.

1984 Which? Apr. 170/1 Recently, modified paints, which have been specially formulated for exterior use, have become available. There is no agreed common name for these finishes and they've been called opaque stains, breathing paints and microporous paints.

1999 Nature 25 Feb. p. ix Microporous and mesoporous inorganic solids, with pore sizes around 20 Å and 20–500 Å respectively, are particularly useful as catalysts and sorption media.