| --- Thu Apr 12 2012 | 00:00 | |
| B0101 | hi azonenberg | 07:57 |
|---|---|---|
| azonenberg | Hi | 07:57 |
| B0101 | guess what... HF acid now costs $250 per 1L bottle | 07:58 |
| azonenberg | In what purity grade though | 07:58 |
| azonenberg | and 1L is a LOT | 07:59 |
| B0101 | Reagent ACS grade | 07:59 |
| azonenberg | Not trace metal? | 07:59 |
| azonenberg | Cant say thats surprising | 07:59 |
| azonenberg | Reagent grade stuff is rarely cheap | 07:59 |
| azonenberg | from reputable suppliers | 08:00 |
| azonenberg | And a liter of HF is a LOT | 08:00 |
| B0101 | i know | 08:00 |
| azonenberg | like, i normally work with 1ml or less | 08:00 |
| azonenberg | of 3% | 08:00 |
| azonenberg | i assume that price is concentrated? | 08:00 |
| azonenberg | I would not want concentrated HF in my current lab lol | 08:00 |
| B0101 | 99.6% purity | 08:00 |
| azonenberg | 99.6% HF???/ | 08:00 |
| B0101 | according to catalogue | 08:01 |
| azonenberg | that has to be compressed gas or something | 08:01 |
| azonenberg | you cant get it liquid at above about 50% | 08:01 |
| azonenberg | its always a solution in water | 08:01 |
| azonenberg | 99% has to be anhydrous hydrogen fluoride gas | 08:01 |
| azonenberg | even nastier than the liquid | 08:01 |
| B0101 | i know, but that is what is written on the catalogue, liquid form, 99.6% | 08:01 |
| azonenberg | Liquid compressed gas or something? | 08:02 |
| B0101 | liquid compressed gas | 08:02 |
| azonenberg | as in stored under pressure in a cylinder | 08:02 |
| azonenberg | In any case | 08:02 |
| azonenberg | I normally work with 3% lol | 08:02 |
| azonenberg | and i cant imagine any application you'd need above like 20% for semiconductors | 08:02 |
| azonenberg | I'd suggest quite strongly you get a lower concentration | 08:03 |
| azonenberg | even if it ends up costing more since you need to buy more of it | 08:03 |
| azonenberg | it's at least a little bit less likely to kill you if something goes wrong | 08:03 |
| azonenberg | i'm paranoid about 3% lol | 08:04 |
| azonenberg | fume hood, full face shield, silver shield gloves, etc | 08:04 |
| azonenberg | And this is for a concentration they used to sell at the local grocery store | 08:04 |
| B0101 | heh, 1L is the lowest volume the supplier sells | 08:05 |
| azonenberg | Volume doesnt matter | 08:05 |
| azonenberg | Its concentration | 08:05 |
| azonenberg | I'd rather have a lot of weak than a little strong | 08:05 |
| B0101 | i know, but it seems crazy to have such concentration of HF acid | 08:06 |
| azonenberg | No idea | 08:06 |
| azonenberg | All i can say is, i would not want to get in the same room as that bottle :p | 08:06 |
| B0101 | lol | 08:06 |
| B0101 | i wonder if HCl acid at 10% concentartion work as a lab glassware cleaner... | 08:08 |
| 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 | 08:10 |
| azonenberg | chromic acid | 08:11 |
| azonenberg | probably | 08:11 |
| azonenberg | I clean most of my glassware with distilled water and Alconox detergent | 08:12 |
| azonenberg | The combination is unfortunately not CMOS compatible, i think | 08:12 |
| azonenberg | i'll have to get all new stuff when i start doing CMOS | 08:12 |
| azonenberg | i've used KOH or NaOH in almost evrery beaker i have | 08:12 |
| azonenberg | and i cant tell the ones i havent from the ones i have | 08:12 |
| B0101 | heh | 08:12 |
| azonenberg | But for now doing PCB etching etc its not a big concern | 08:12 |
| azonenberg | or metal patterning | 08:12 |
| azonenberg | or KOH etching :p | 08:12 |
| B0101 | ok | 08:13 |
| B0101 | heh, well, i've gtg, i have got an experiment to run. cya | 08:13 |
| Sync | azonenberg: I have a 10l canister of "concrete cleaner" | 09:45 |
| Sync | it says 30% HF and the rest H2SO4 on the label | 09:46 |
| --- Fri Apr 13 2012 | 00:00 | |
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