Can I use Fingertight Polyketone fittings in Bio inert System?

Due to pressure problems in the bioinert LC, the Swagelok 1.6 mm finger-tight PEEK Rheflex fitting cannot be used in the Multi Draw kit. The back pressure is about 500 bar. Has anyone had this experience? If so, what ferrules&fittings should I recommend to the customer? Can Fingertight Polyketone(5042-8957) be applied to bio-inert system?

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