Freudenberg Perfluoroelastomer (Simriz®)

Freudenberg Simriz® Perfluoroelastomer (FFKM) Material Description:

Simriz® perfluoroelastomers (FFKM) are produced using special perfluorinated, completely hydrogen-free monomers, with appropriate compounding and processing techniques. They represent the high-end solution in materials technology.

Simriz® is characterized by a broad chemical resistance similar to that of PTFE, combined with the rubber-elastic properties of an elastomer. With Simriz®, Freudenberg offers a complete range of high-quality FFKM materials. In addition to the Simriz® compounds for standard and high temperature applications, there is a FDA- and USP Class VI-compliant variant, which is ideally suited for use in the food and pharmaceutical industries.

Thanks to FFKM, utmost temperature and media resistance is not reserved only to PTFE materials with a degree of fluorination of 76%. The operating conditions are limited when using PTFE due to its tendency to cold flow and lack of elasticity. At high pressures and many changes in temperature, pure PTFE seals prove to be unsuitable. Simriz®, on the other hand, combines almost the identical universal resistance of PTFE with the elastic advantages of elastomers.

Therefore, with Simriz® many sealing problems can be solved better and easier. Simriz® also shows very reliable properties in static and dynamic applications, as well as in frequent temperature changes and aggressive media. In addition, Simriz® as FFKM offers the highest degree of fluorination among elastomers. The high bond energy between carbon and fluorine atoms enables excellent resistance to a variety of chemicals with different reactive functional groups and the use in polar and non-polar media, even at high concentrations and temperatures. In addition, the temperature stability with approximately –10 °C to +325 °C (+14 °F to +617 °F) is extraordinarily comprehensive for an elastomer.

Freudenberg Seal Distributor

Engineered Seal Products is proud to be a "Freudenberg North American Preferred Partnered":

  • Involvement of engineering services and technical material know-how from Freudenberg Sealing Technologies
  • Highest technical seal competence through qualified training and certified sealing know-how
  • Efficient and speedy cross-linked processes with Freudenberg Sealing Technologies
  • High and quick availability assuring a reliable delivery performance
Simriz® (FFKM) Suitable Applications:
  • Water and water vapor
  • Concentrated acids (e.g. nitric acid 60%)
  • Amines (e.g. ethylenediamine)
  • Organic acids (e.g. acetic acid)
  • Ketones (e.g. methyl-ethyl-ketone)
  • Alkaline solutions (e.g. sodium-hydroxide, potassiumhydroxide)
  • Organic solvents (e.g. methanol)
  • Aroma concentrates

Freudenberg Simriz® Perfluoroelastomer (FFKM) Compounds:

Compound Number Datasheet Hardness (Shore A) Low Temp High Temp Color Products
70 Simriz® 491 PDF 70 +- 5 -20 230 Black Molded part, O-Rings
75 Simriz® 494 PDF 75 +- 5 -15 230 Black Diaphragms on request, O-Rings
75 Simriz® 495 PDF 75 +- 5 -15 230 Black O-Rings
75 Simriz® 497 PDF 75 +- 5 -15 325 Black O-Rings
75 Simriz 506 72 +- 5 -15 230 White Molded parts, O-Rings
80 Simriz® 492 PDF 80 +- 5 -10 230 Black Molded parts
85 Simriz® 496 PDF 85 +- 5 -15 250 Black O-Rings

ASTM Designation
Shelf Life
25 Years
Hardness (Shore A) Range
65 - 90

Temperature ranges will apply to the majority of media for which the material is potentially recommended. With some media however, the service temperature range may be significantly different. ALWAYS TEST UNDER ACUTAL SERVICE CONDITIONS.

ESP’s shelf life recommendation is based on the ARP 5316 standard and intended to be utilized by those organizations who do not already have specific recommendations for the control of elastomeric seals. It should be noted that the packaging of the elastomeric seals prior to assembly into a product is an integral part of the controlled storage procedure. It provides a positive means of product identity from the time of manufacture, to the time of assembly.