Oct 19, 2016
Cleaning for new teflon (PFA/FEP/PTFE)
- Seth John
- John Lab
Protocol Citation: Seth John 2016. Cleaning for new teflon (PFA/FEP/PTFE). protocols.io https://dx.doi.org/10.17504/protocols.io.fvabn2e
License: This is an open access protocol distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Protocol status: Working
Created: September 22, 2016
Last Modified: March 23, 2018
Protocol Integer ID: 3714
Keywords: old teflon product, new teflon, ptfe, pfa, fep
Abstract
Protocol for cleaning new and old teflon products.
Guidelines
All acid soaking is done HOT but not boiling on hotplate in clean lab (you may want to loosen nuts on jars to reduce pressure)
-50% acids should be recycled until you feel uncomfortable doing so, 1-3M can be (use your own intuition on how dirty it is)....weak acids are never recycled.
-Teflon cleaning jars AND still acid bottles from beth have been handled with vinyl gloves, be careful not to handle them with clean PE gloves and then handle other things.
Soak in citrad (~couple of hours).
Rinse thoroughly UPW.
mmerse completely (in 1 L jars or bottles) in 50% v/v distilled HNO3 for >=48hrs
Rinse thoroughly UPW.
Immerse completely (in 1 L jars or bottles) in 50% v/v distilled HCl for >=48hrs
Rinse thoroughly UPW.
Immerse completely (in 1 L jars or bottles) in 0.1% v/v distilled HNO3 for >=48hrs
Rinse thoroughly UPW.
Immerse completely (in 1 L jars or bottles) in 1-3M v/v distilled HNO3 for >=48hrs
Rinse thoroughly UPW.
Fill and store with ~0.1% v/v distilled HNO3
For already-cleaned teflon for Geotraces
- Rinse with UPW.
- Fill with 1-3M v/v distilled HNO3 for 24-48hrs.
- Rinse thoroughly with UPW.
- Fill with ~0.1% v/v seastar Nitric/distilled acid for as long as possible before use (minimum recommended a few hours).