In rigorous third-party testing for rapid gas decompression (RGD) resistance per the NORSOK M-710 Rev 2 standard, Kalrez 0090 O rings received the best possible rating of 0000. The tests were conducted by the independent Materials Engineering Research Laboratory Ltd. (MERL) in the U.K.
“The 0000 rating for RGD resistance is critically important for customers,” says Arun Gopalakrishnan, the global market segment leader of DuPont Performance Polymers. “O rings with ratings poorer than Kalrez 0090 rating of 0000 are likely to suffer greater cracking when exposed to pressure cycling. Once a crack is initiated, gas will accumulate at the next pressure cycle, eventually leading to a complete crack across the section, which could lead to seal failure.”
MERL has also certified the excellent resistance of Kalrez O rings to sour fluid ageing, including multi-phase fluids containing hydrogen sulfide. Kalrez O rings withstand attack by more than 1,800 chemicals and solvents in all. They retain high levels of elasticity and recovery even after long-term exposure to temperatures up to 250°C and have excellent extrusion resistance.