Activity Feed › Forums › Sign Discussion › General Sign Topics › has anyone heard of the material flexiboard? › Reply To: has anyone heard of the material flexiboard? James Martin Member April 3, 2008 at 6:10 pm A search for staufen board has led me to a site that explains what it is and it looks OK. The same site has polypropylene board which looks even better. tks. whats is HIPPS then?