Fluoroblack E-900 is chemically modified containing a specially formulated electrocarbon filler material. E-900 is an excellent material for prolonged service against high concentrations of hydrofluoric acid. This combination of materials may make Fluoroblack E-900 the lowest deforming PTFE based material available. E-900 is also used to encapsulate perforated stainless steel inserts for use in our Fluoroflange gaskets. Physical Properties ASTM Method F-37 F-38 F-36 F-152 D-638 D-792 D-1700 F-36 Characteristic Sealability Creep Relaxation % Compressibility, Range % Tensil strength, PSI Elongation Specific Gravity Hardness, Shore D-2 Recovery, % Fluoroblack E-900 0.001 17.0 5-7 2400 150 2.11 66 33 Temperature and Pressure Ratings           Material Fluoroblue E-140 Pressure 800 PSI Temperature -350^o - +500^o F Color Blue CONTAINS NO ASBESTOS                                          All UFC Fluorogreen products are made in the USA E-900 Fluoroblack is a registered trademark