http://printwiki.org/Buna_NRecent Changes of the page "Buna N" on PrintWiki.en-us http://printwiki.org/Buna_N2007-09-06 12:00:00Encyclopedia of Graphic Communications Import <div id="content" class="wikipage content"> Differences for Buna N<p><strong></strong></p><table> <tr> <td> <span> Deletions are marked with - . </span> </td> <td> <span> Additions are marked with +. </span> </td> </tr> <tr> <td> Line 1: </td> <td> Line 1: </td> </tr> <tr> <td> </td> <td> <span>+ A widely-used type of synthetic rubber produced by the ["polymerization"] of butadiene with acrylonitrile, invented in the mid-1930s in Germany and available in the United States just prior to the outbreak of World War II. Different grades of Buna N contain differing amounts of acrylonitrile (the amount can vary from 15:40%), greater amounts of acrylonitrile imparting greater resistance to oils. Buna N rubber is resistant to ["aliphatic hydrocarbon"]s, alcohols, water, and other substances, but not to ["aromatic hydrocarbon"]s or ["ester"]s. Buna N (and other synthetic rubbers such as ["neoprene"]) have more stable properties than natural rubbers. Buna N is widely used in the manufacture of printing press rollers, such as those for inking, dampening, and impression, as well as ["blanket"]s used in ["offset lithography"] and plates used in ["flexography"]. Buna N is also known as Perbunan and NBR. ''Buna S'', a synthetic rubber developed at the same time as Buna N, is produced by polymerizing butadiene with styrene and is widely used for tires and other such uses.</span> </td> </tr> </table> </div>