Hide your sulphuric acid

On Tuesday, November 23, 2021 at 11:53:17 AM UTC+11, Robert Baer wrote:
> Jeff Layman wrote: 
> > On 21/11/2021 05:12, Robert Baer wrote: 
> > 
> >>     Strange, HOOH is the most corrosive substance on the planet there is. 
> >>     The more pure, the more corrosive. 
> > 
> > Not even close: 
> > <https://en.wikipedia.org/wiki/Fluoroantimonic_acid> 
> >
> HOOH reacts with PTFE and "pure" HOOH will decompose it.

https://www.calpaclab.com/teflon-ptfe-compatibility/

lists polytetrafluorethane as perfectly resistance to 100% hydrogen peroxide.

What's your evidence that it isn't? My memory is that it resists anything short of molten sodium.

-- 
Bill Sloman, Sydney

On Tuesday, 23 November 2021 at 02:59:47 UTC, bill....@ieee.org wrote:
 
> lists polytetrafluorethane as perfectly resistance to 100% hydrogen peroxide. 
> 
> What's your evidence that it isn't? My memory is that it resists anything short of molten sodium. 
> 

There are some etchants like Tetra-etch which is an organo-sodium compound.
Also, sodium dissolved in liquid ammonia attacks ptfe.
John