Viscous, flowable, pressure-compensating fitting materials or compositions having low density, sturdy, glass microbeads and lightweight, sturdy resinous microbeads substantially uniformly distributed therein, which are suitable for a variety of uses and applications, including, but not limited to, fitting...http://www.google.es/patents/US4229546?utm_source=gb-gplus-sharePatente US4229546 - Viscous, flowable, pressure-compensating fitting compositions having therein both glass and resinous microbeads
Viscous, flowable, pressure-compensating fitting compositions having therein ...
