Sealing materials biocompatible

Phosphate glasses These have glass transition temperatures typically < 1000°C and thermal expansion coefficients which make them suitable for applications such as glass-to-metal seals and biocompatible materials. The Na MAS NMR spectra reported... 

Several biocompatible HPLC and UHPLC systems are also available, engineered with a bio-inert flow path made of non-stainless steel materials (such as titanium or PEEK) for protein analysis. Stainless steel equipment and tubing should be avoided for protein analysis by aqueous/salt-based methods because protein chelation with metals can negatively affect separation (19). These interactions can either occur with metal contaminating the column or with corroded surfaces within the instrument. In addition to affecting separation, corrosion can result in physical damage to the system, such as pump seal failure and compromised performance of the detector cells. Stainless steel systems may require periodic passivation for reliable usage (20). 

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