regarding NaOH and glass...

[benzyme]

apparently (contrary to what I figured), conc. lye does react with glass, forming some complex of sodium-silicate; but this takes years of storage to do any serious harm to the structural integrity of the container.

 

[mumbles]

NaOH will also etch glass.

 

[Oncewas]

I actually was wondering about this myself recently.

What concerned my more is using mason jars for STB and the metal reacting with the lye/water soln.

 

[Dimitrius]

I actually was wondering about this myself recently.

What concerned my more is using mason jars for STB and the metal reacting with the lye/water soln.

Especially considering the lids are made of aluminum.

 

[benzyme]

NaOH will also etch glass.

that's what I meant by reacting with glass, causing harm to the structural integrity

but it won't etch it nearly as quickly as CsOH or HF, it takes a while.

 

[shoe]

I doubt pyrex or other lab glass will react significantly with NaOH solution

 

[Infundibulum]

NaOH will also etch glass.

that's what I meant by reacting with glass, causing harm to the structural integrity

but it won't etch it nearly as quickly as CsOH or HF, it takes a while.

I had a very similar conversation a couple of days ago. I was saying to my friend that he needs to oil his rifle so it doesn't oxidise, and he said: "yeah, this and also for not getting rusty"!

 

[psychosisdoses]

I had a very similar conversation a couple of days ago. I was saying to my friend that he needs to oil his rifle so it doesn't oxidise, and he said: "yeah, this and also for not getting rusty"!

HaHaHa!


/me rubs mossberg with steel wool and typewriter oil

 

[tropane]

Ya gotta be careful with NAOH and glass.

SWIM has personally had a jar crack on him during the mixing process of water + NAOH.
Whether it was the NAOH itself or the heat generated from it is uncertain.
Talk about a wild purple mess.

From that point on, SWIM always mixes his NAOH and water in a plastic jug and then
transfers it to glass once it's thoroughly mixed and cooled down.

 

[benzyme]

swim's always done it in a borosilicate beaker, at home, and in the lab.standard protocol
the only plastic he puts it in is the waste carboys.

 

[kemist]

NaOH will also etch glass.

that's what I meant by reacting with glass, causing harm to the structural integrity

but it won't etch it nearly as quickly as CsOH or HF, it takes a while.

I had a very similar conversation a couple of days ago. I was saying to my friend that he needs to oil his rifle so it doesn't oxidise, and he said: "yeah, this and also for not getting rusty"!

LOL :lol:



Benzyme what is the machine in your avatar?

 

[benzyme]

turbomolecular pump

 

[kemist]

turbomolecular pump

:O charming

 

[Ufostrahlen]

I investigated this matter, because I wanted numbers. If in doubt, one want:

Borosilicate glass, Akali resistance class ISO 695-A2 or A1

However, at ambient temperatures caustic solutions up to 30% concentration can be handled by borosilicate glass without difficulty.

[..]

Alkali attack on borosilicate glass 3.3 as a function of temperature. It can be seen from the corrosion curves in fig. 2 that the attack on the glass surface initially increases as the concentration of the caustic solution increases but after exceeding a maximum it assumes a virtually constant value. Rising temperatures increase the corrosion, while at low temperatures the reaction speed is so low that reduction of the wall thickness is hardly detectable over a number of years.

http://www.scientificglass.co.uk/pdf/SGL_Glass_Traps_Chemical_Composition_of_Borosilicate_glass.pdf

At ambient temperatures, borosilicate glass 3.3 can nevertheless be exposed without difficulty to alkaline solutions in concentrations of up to 30%.

Lab & Process Glass

Through their expertise in Borosilicate glass 3.3, continuous improvement, and close cooperation with the laboratory and Industrial sector, Normag has become the leading manufacturer of equipment for pharma and chemical processes.

www.normag-glas.de