<HTML>Peter,
The McMaster Carr online catalog [
www.mcmaster.com] page 3236 has very high performance packing. Carbon reinforced graphite suitable for steam temparatures +1200 and pressures to 4500#'s. This stuff is very shiny, slippery and flexible. I'm trying it out in a 20 horse stanley now. As for seals are you mean piston rings or some rotary application?
Dick</HTML>