An apparatus and methods of manufacturing seamless gaskets using expanded intercalated graphite worms, in which an annular die cavity has a central column with a charge inlet in a perimeter wall. Expanded intercalated graphite worms communicate from a source through the charge inlet in the annular die...http://www.google.com/patents/US6540852?utm_source=gb-gplus-sharePatent US6540852 - Apparatus and method for manufacturing gaskets
