John Crane Style 387I is a special high-temperature/pressure and corrosion-inhibited valve stem packing specifically designed for steam valve service commonly related to power generation.
A round braided jacket of Inconel wire-inserted "S2" fiberglass over a specially designed extruded core containing chopped glass fibers, graphitic binders plus corrosion inhibitors. An external coating of a proprietary colloidal graphite dispersion is added, providing a highly lubricated sealing surface and protective coating.
4,300 psi(g)/296 bar(g)
2 to 12 (non-buffered solutions)