<B0101>
guess what... HF acid now costs $250 per 1L bottle
<azonenberg>
In what purity grade though
<azonenberg>
and 1L is a LOT
<B0101>
Reagent ACS grade
<azonenberg>
Not trace metal?
<azonenberg>
Cant say thats surprising
<azonenberg>
Reagent grade stuff is rarely cheap
<azonenberg>
from reputable suppliers
<azonenberg>
And a liter of HF is a LOT
<B0101>
i know
<azonenberg>
like, i normally work with 1ml or less
<azonenberg>
of 3%
<azonenberg>
i assume that price is concentrated?
<azonenberg>
I would not want concentrated HF in my current lab lol
<B0101>
99.6% purity
<azonenberg>
99.6% HF???/
<B0101>
according to catalogue
<azonenberg>
that has to be compressed gas or something
<azonenberg>
you cant get it liquid at above about 50%
<azonenberg>
its always a solution in water
<azonenberg>
99% has to be anhydrous hydrogen fluoride gas
<azonenberg>
even nastier than the liquid
<B0101>
i know, but that is what is written on the catalogue, liquid form, 99.6%
<azonenberg>
Liquid compressed gas or something?
<B0101>
liquid compressed gas
<azonenberg>
as in stored under pressure in a cylinder
<azonenberg>
In any case
<azonenberg>
I normally work with 3% lol
<azonenberg>
and i cant imagine any application you'd need above like 20% for semiconductors
<azonenberg>
I'd suggest quite strongly you get a lower concentration
<azonenberg>
even if it ends up costing more since you need to buy more of it
<azonenberg>
it's at least a little bit less likely to kill you if something goes wrong
<azonenberg>
i'm paranoid about 3% lol
<azonenberg>
fume hood, full face shield, silver shield gloves, etc
<azonenberg>
And this is for a concentration they used to sell at the local grocery store
<B0101>
heh, 1L is the lowest volume the supplier sells
<azonenberg>
Volume doesnt matter
<azonenberg>
Its concentration
<azonenberg>
I'd rather have a lot of weak than a little strong
<B0101>
i know, but it seems crazy to have such concentration of HF acid
<azonenberg>
No idea
<azonenberg>
All i can say is, i would not want to get in the same room as that bottle :p
<B0101>
lol
<B0101>
i wonder if HCl acid at 10% concentartion work as a lab glassware cleaner...
<B0101>
I remember that there was a certain chemical that cleans glassware. just that it was a known carcinogen, emits deadly fumes and impossible to get rid of safely
<azonenberg>
chromic acid
<azonenberg>
probably
<azonenberg>
I clean most of my glassware with distilled water and Alconox detergent
<azonenberg>
The combination is unfortunately not CMOS compatible, i think
<azonenberg>
i'll have to get all new stuff when i start doing CMOS
<azonenberg>
i've used KOH or NaOH in almost evrery beaker i have
<azonenberg>
and i cant tell the ones i havent from the ones i have
<B0101>
heh
<azonenberg>
But for now doing PCB etching etc its not a big concern
<azonenberg>
or metal patterning
<azonenberg>
or KOH etching :p
<B0101>
ok
<B0101>
heh, well, i've gtg, i have got an experiment to run. cya
fpgaminer has joined #homecmos
<Sync>
azonenberg: I have a 10l canister of "concrete cleaner"
<Sync>
it says 30% HF and the rest H2SO4 on the label