| http://www.w3.org/ns/prov#value | - In accordance with the present invention, a fibrous web, composed of paper, cotton, synthetic fibers, combinations of fibers, or the like, is impregnated with a reaction product of a carbamide-aldehyde resin and starch, and this reaction product is subsequently cured to produce a web whose porosity and other filtering characteristics as well as its flexibility make it an ideal filtering material f
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