FFKM Sealing Technology
Reliable Sealing? – It Depends on the Compound!
Being that it is a FFKM, PFE 7502BZ Chemshield possesses both the exceptional chemical resistance properties of PTFE and the elastic properties of FKM rubber. Unlike FKM types, however, perfluoroelastomers, which have fully fluorinated backbones, have only C-F bonds that are the strongest in organic chemistry, making them highly resistant to aggressive environments.
In addition, FFKMs maintain their elastic properties, such as compression set resistance low volume swell longer than conventional elastomeric types. Temperature plays a decisive role in diminishing compression set performance, speeding up the aging process and eventually leading to the breakdown of polymer backbones and cross links and subsequent leakage and a host of other ills. The high heat resistance of this sealing technology is very welcome here.
It's all About the Chemical Resistance
Comparing the chemical resistances of FKM and PFE 7502BZ Chemshield to hot fluid media, including acids, i.e. hydrochloric, nitric, sulfuric, acetic (glacial), solvents, bases, such as ammonia and sodium hydroxide, as well as ethylene diamine, water and steam, PFE 7502BZ Chemshield performs significantly better than FKM. Moreover it’s continuous temperature of 275 °C is about 50 degrees higher than that of FKM. While both have the same compression set of 15 for 70 hours at 200 °C.
Verified and Certified for Hygienic Use
The compound complies with their extremely high standards of key international food and drug supervision agencies, including the FDA, USP Class VI, and EU No. 10/2011 with all its amendments. It is safe for use as sealing material in Pharmaceutical, Food and Beverage applications. It complies with the FDA standard for the use in food processing, pharmaceutical products, cosmetics, biotech products, medical devices and radioactive drugs for oncology.
Besides PFE 7502BZ Chemshield, 3M’s range of FFKM products for sealing applications include Perfluoroelastomer PFE 90Z, a peroxide curable FFKM gum, Perfluoroelastomer PFE 7301BZ Heatshield, a high-temperature, triazine cure compound with superior temperature resistance (316 °C continuous) and the new Perfluoroelastomer E-21464 Heatshield compound (316 °C continuous with improved long term compression set) to name a few.