# Labware to handle hot aqueous NaOH

This question regarding appropriate handling of hot concentrated aqueous $$\ce{NaOH}$$ - with particular concern for avoiding dissolution of borosilicate glassware and contamination of the $$\ce{NaOH}$$ solution and other reagents - led me to think of two possible solutions:

1. Coat the glassware with a silane, providing say a polyfluorinated or other inert protective coat

2. Avoid using glass, choose instead metal or plastic, if possible

Is either of these choices reasonable or common, or is there a better alternative? If so, which is best (considering chemical inertness, safety, complexity (including potentially cost), in that order of priority)?

In the case of choice 2, what commercial sources are there for such labware (for handling hot caustic solution for extended period). A cursory search - eg google and Merck website - did not turn up such products.

Note this question is about relatively small-scale labware (benchtop), not for reactors and the like. Volume max $$\pu{5 L}$$, $$\pu{1 M}$$ $$\ce{NaOH}$$, $$\pu{>100^oC}$$, exposure time >1 h.

• Even a weak alkali solution should not be stored in glass or quartz vessels for an extended time as it will inevitably react with any glass ("hard" borosilicate glass reacts slower, but still). For a hot alkaline solution exposure should be limited to minutes, maybe an hour if the glass is thick enough. Old lab textbooks suggested to coat glassware used for storing alkali solutions from the inside with paraffin; these days teflon seems to be better alternative, as you suggested. – andselisk Aug 3 at 5:22
• @andselisk Thanks. Thermo-fisher offers plastic-coated glassware ("kimcote") but that's not ptfe and not sure it would hold up. I find it strange ptfe coated products are not more prominent in product catalogues. A websearch shows me hits that cater mostly to manufacturing, not labs. – Buck Thorn Aug 3 at 5:38
• TBH, I think we never bought teflon labware as it was always ridiculously overpriced. It was always cheaper and faster to craft own reactors with a lathe from a raw piece of teflon which is quite cheap (speaking of central Russia). – andselisk Aug 3 at 5:45