This glass microsphere filled PTFE sheet, blue in color, provides the features of soft faced reinforced PTFE and is an excellent choice for glass lined flange applications. Like other PTFE sheets it is impervious to chemical attack.
511 is a silica filled PTFE / SIGMA sheet, fawn in color. It is commonly used in sulfuric acid applications. Used in sealing all chemicals except molten alkali metals, fluorine gas and hydrogen fluoride. SIGMA 511 can also be used for both cold and hot potable water.
522 is a barium sulfate filled PTFE / SIGMA sheet consisting of three layers.The off white barium sulfate filled PTFE is the center layer with virgin PTFE facings. It exhibits exceptional compression and recovery characteristics. These features make it a good selection for glass lined flanges or any other application where loading problems exist.
SIGMA 533 a pigment free barium sulfate filled PTFE sheet generally used in the food and pharmaceutical industries. Applications include aqueous hydrogen fluoride, strong caustics, and other general chemical media. It is however not suitable for sealing molten alkali metals or fluorine gas.
SIGMA 544 is “fawn” colored silica filled PTFE sheet with a tanged core. It exhibits excellent creep resistance. Used in sealing a myriad of chemicals such as strong acids, solvents, steam, chlorine, except hydrofluoric acid, molten alkali metals, fluorine gas and hydrogen sulfide.
SIGMA 577 is a three layer PTFE sheet consisting of a center core of SIGMA 511, silica filled, PTFE with soft virgin PTFE facings. SIGMA 577 can be used in moderate concentrations of acids, solvents, caustics and hydrocarbons. The soft virgin PTFE facings makes it an excellent choice for glass lined components.