Compression Packing Seal Graphite Filament Packing with Graphite Square 5/16 In. Length 5 Ft Dull Gray Color Ambient Temp Range -450 to 800 F Max Temp in Steam 1200 F Max Pressure for Pumps 3500 PSI Max Pressure for Valves 3500 PSI Max Shaft Speed 4000 Ft/Min pH Range 3 to 14 For Use In Pumps/Valves Application Designed for Severe Service Applications like Digestors and Chemical Pumps