Suitable glassware for etching mechanism using strong acids at elevated temperatures.
Dear Leena,
if you have hydrofluoric acid in solution, then you cannot use any silicate glass, including laboratory boro-silicate glass and even quartz glass. You can use teflon (PTFE) vessels, as they are resistant to all the substances you have listed and can withstand temperatures above 200°C.
Dear Leena,
Teflon are the best. We used the same for our experiments. Please follow suggestions of Prof.Verlotski.
Cheers
In our Laboratory, we use Teflon (PTFE) beakers as they are resistant to corrosive acids and can be used at high temperatures (>180 degrees celsius).
The main problem is cleaning the beakers after use particularly when it is used for etching MAX phases with HF. Hence proper cleaning and maintenance are required.
About corrosion of laboratory borosilicate glassware by phosphoric acid:
Common laboratory borosilicate glassware ̶ often either called 'borosilicate 3.3' or Pyrex® glass ─ is expected to be seriously corroded by concentrated (conc.) aqueous solutions of phosphoric acid above ~120 °C. Use of conc. H3PO4 (> 30 wt%) from ~40 ºC to ~120 ºC is also not recommended, in general, but can be found acceptable after carefully consideration of the particular experimental circumstances involved by experienced users. Below ~40 ºC, corrosion is expected to be small, but prolonged contact of the glassware with conc. H3PO4 should be also avoided, particularly when volumetric glassware is used or when contamination of the contained liquid with ions contributed by glass corrosion must be avoided to any appreciable extent.
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