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What is the pH range of PEEK laboratory tubing and fittings?

Reference Number: AA-00718 Created: 05/12/2012 03:35 PM Last Updated: 07/03/2013 09:29 AM

According the some manufacturers of PEEK, the useful pH range of PEEK tubing and fittings for HPLC is 2 - 14 for use with HPLC solvents and buffers.

However, I would be very careful with pH 0 to 6 for long term exposure. PEEK is manufactured using Phosphoric Acid and some of the granulate may even still contain thisAcid, meaning that this acid should be a strong reagent for PEEK. I suggest a higher pH as starting point for solutions with medium to high ionic strength for long term exposure.

PEEK laboratory tubing information

 

 

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