Wide range of chemical resistance
Kalrez O-rings can resist more than 1,800 types of chemicals, including strong acids (e.g., concentrated nitric acid), strong alkalis (e.g., sodium hydroxide), organic solvents (e.g., toluene, acetone, dichloromethane), ethers, ketones, esters, benzene ring solvents, strong oxidants, amine compounds, fuels, oils and greases, etc.
Its perfluoro main chain structure has no active reaction sites, fundamentally eliminating the possibility of corrosion failure.
Verification of chemical corrosion resistance
Swelling test: After 6 months of immersion in a mixed solution of toluene, acetone and dichloromethane, Kalrez O-rings show almost no volume change, while other rubbers undergo severe deformation.
Comparative test: When Kalrez and fluororubber are immersed in organic media such as acetone and toluene, fluororubber swells significantly after 16 minutes, whereas Kalrez remains stable.
Advantages in chemical corrosion resistance
Far superior corrosion resistance to ordinary rubbers: Kalrez can maintain its sealing performance even in extreme chemical environments, while ordinary rubbers may suffer from volume expansion and sealing failure due to molecular chain breakage or cross-linked structure damage.
Better corrosion resistance than other perfluoroelastomers: Kalrez has superior recovery performance after compression and can better maintain its shape under long-term pressure, thus ensuring a tight seal for an extended period.
Applications of chemical corrosion resistance performance
Semiconductor industry: Used for corrosion-resistant sealing in etchers and CVD equipment, reducing process contamination (low particle generation and low extractables), and resistant to degradation in harsh plasma environments.
Oil and gas industry: High-pressure sealing for deep well drilling equipment, withstanding corrosive media such as hydrogen sulfide and carbon dioxide.
Chemical industry: Sealing for reactors, pipelines, valves and other equipment to prevent chemical leakage and corrosion.
Medical and food industries: FDA-certified grades (e.g., Kalrez 6230) are used for sealing in pharmaceutical and food processing equipment to ensure product safety and purity.