Isopropyl Alcohol

[TipsyMcStagger]

The warning label on isopropyl generally says that ingestion will cause "serious gastric disturbances"

 

[nismotigerwvu]

Originally posted by: Aflac
Acetone is better.

Acetone is FANTASTIC for dissolving anything organic.
Those of us here who've taken O-chem will know.
Those of us who've taken biochem will know why.
But isopropyl is quite good at what it does (and tends not to mangle everything in sight like acetone will)

 

[PlasmaBomb]

Originally posted by: RU482

Originally posted by: Aflac
Acetone is better.

At eating plastics

DCM?

 

[Eli]

LOL

If you drink isopropyl alcohol, a hangover is the least of your worries.

 

[Tiamat]

Yup, IPA strikes a great compromise for its cleaning strength while leaving no impurities on the surface. Acetone is a stronger cleaner, but leaves impurities on the surface of what was cleaned.

An experiment that I did during undergrad that I thought was cool was to freeze IPA in LN2. As the IPA approaches it's freezing point in LN2, the mixture turns into a very viscous liquid that is as thick as honey/molasses.

 

[Eli]

Originally posted by: Tiamat
Yup, IPA strikes a great compromise for its cleaning strength while leaving no impurities on the surface. Acetone is a stronger cleaner, but leaves impurities on the surface of what was cleaned.

An experiment that I did during undergrad that I thought was cool was to freeze IPA in LN2. As the IPA approaches it's freezing point in LN2, the mixture turns into a very viscous liquid that is as thick as honey/molasses.

I think you're mistaken. Acetone should evaporate clean away, as long as the acetone is pure in the first place.

Xylene leaves impurities though.

 

[silverpig]

Originally posted by: MegaVovaN
You can get 99% in same places as 91% and 70%...
BTW I do not think 99.9% is stable, it will absorb water from air and become less. Probably same applies to 99% and even 91%?

Another danger is that (reportedly) isopropyl tastes exactly like ethyl (regular), so you won't even notice that you are drinking poison.

No it doesn't. I have 100% EtOH and 100% IPA in the lab. They smell completely different. EtOH smells almost like candy. IPA is much more pungent.

 

[silverpig]

Originally posted by: Eli

Originally posted by: Tiamat
Yup, IPA strikes a great compromise for its cleaning strength while leaving no impurities on the surface. Acetone is a stronger cleaner, but leaves impurities on the surface of what was cleaned.

An experiment that I did during undergrad that I thought was cool was to freeze IPA in LN2. As the IPA approaches it's freezing point in LN2, the mixture turns into a very viscous liquid that is as thick as honey/molasses.

I think you're mistaken. Acetone should evaporate clean away, as long as the acetone is pure in the first place.

Xylene leaves impurities though.

Acetone DEFINITELY leaves a residue, and I get the CMOS grade stuff. If you put a wafer in acetone then let it evaporate it gets a film of crap all over it. Generally we clean in trichloroethylene, then acetone, then either IPA or methanol to get rid of the acetone residue. This is just for easily soluble organics. There are better cleans which can get the stuff that TCE and acetone can't get.

 

[Vette73]

The reason 70% is so common is that is what is called for to clean up in medical areas. Such as drug makers, hospitals, doctors offices, etc... that is the smell most people smell when they go to places such as those.

70% with 30% water is the percent that kills germs the best. If you go much higher than 70% the "germs" don't open and allow any in. But with 30% water they open in and "drink" it and it kills them. So if disinfecting is your game then use the 50-70% stuff.

 

[biggestmuff]

It works well with soda. Iso and Coke is a great combo. :thumbsup::beer:

 

[Tiamat]

Originally posted by: Eli

Originally posted by: Tiamat
Yup, IPA strikes a great compromise for its cleaning strength while leaving no impurities on the surface. Acetone is a stronger cleaner, but leaves impurities on the surface of what was cleaned.

An experiment that I did during undergrad that I thought was cool was to freeze IPA in LN2. As the IPA approaches it's freezing point in LN2, the mixture turns into a very viscous liquid that is as thick as honey/molasses.

I think you're mistaken. Acetone should evaporate clean away, as long as the acetone is pure in the first place.

Xylene leaves impurities though.

I am not mistaken, and Xylene/Toluene are stronger solvents and do leave impurities. My experience is with silicon wafer degreasing and cleaning in preparation for ultra high vacuum (10E-11 torr) environments.

Generally for mild degreasing, it is good enough to start with acetone, then IPA, then EtOH, then methanol, then degassed DI 18Mohm water. This process allows for better than PPB surface impurity count which is necessary for ultra-high vacuum to be obtained in a timely fashion (hours instead of days).

In the presence of high flowing dry nitrogen, it is possible that acetone alone may not leave significant residue, however, for all intents and purposes, the multi-step graduated cleaning method is generally accepted by all surface scientists and surface chemists.


Looks like silverpig does exactly as I mentioned! I only had to use TCE once, and that was done with the silicon as received from the vender (and following RCA clean). Any other relatively clean manipulation of the substrate only required acetone as the lead solvent.

 

[Eli]

Originally posted by: silverpig

Originally posted by: Eli

Originally posted by: Tiamat
Yup, IPA strikes a great compromise for its cleaning strength while leaving no impurities on the surface. Acetone is a stronger cleaner, but leaves impurities on the surface of what was cleaned.

An experiment that I did during undergrad that I thought was cool was to freeze IPA in LN2. As the IPA approaches it's freezing point in LN2, the mixture turns into a very viscous liquid that is as thick as honey/molasses.

I think you're mistaken. Acetone should evaporate clean away, as long as the acetone is pure in the first place.

Xylene leaves impurities though.

Acetone DEFINITELY leaves a residue, and I get the CMOS grade stuff. If you put a wafer in acetone then let it evaporate it gets a film of crap all over it. Generally we clean in trichloroethylene, then acetone, then either IPA or methanol to get rid of the acetone residue. This is just for easily soluble organics. There are better cleans which can get the stuff that TCE and acetone can't get.

Hmmm..

Everything I've ever read says that pure acetone evaporates clean away. Are you sure the impurities you're seeing aren't introduced later?

I've gotta run some errands, but will come back to this with more googling.

 

[Nik]

Isopropyl and rock salt do wonders for cleaning glass.

 

[Mrvile]

I never use 70% because there is too much other "junk" in it. I always have a bottle of 91 lying around, I don't know where you guys are getting 99...

 

[Eli]

Originally posted by: Mrvile
I never use 70% because there is too much other "junk" in it. I always have a bottle of 91 lying around, I don't know where you guys are getting 99...

The other "junk" in 70% is distilled water.

 

[StevenYoo]

Originally posted by: Nik
Isopropyl and rock salt do wonders for cleaning glass.

rock salt is also great for shooting uma thurman

 

[Tiamat]

Originally posted by: Eli

Originally posted by: silverpig

Originally posted by: Eli

Originally posted by: Tiamat
Yup, IPA strikes a great compromise for its cleaning strength while leaving no impurities on the surface. Acetone is a stronger cleaner, but leaves impurities on the surface of what was cleaned.

An experiment that I did during undergrad that I thought was cool was to freeze IPA in LN2. As the IPA approaches it's freezing point in LN2, the mixture turns into a very viscous liquid that is as thick as honey/molasses.

I think you're mistaken. Acetone should evaporate clean away, as long as the acetone is pure in the first place.

Xylene leaves impurities though.

Acetone DEFINITELY leaves a residue, and I get the CMOS grade stuff. If you put a wafer in acetone then let it evaporate it gets a film of crap all over it. Generally we clean in trichloroethylene, then acetone, then either IPA or methanol to get rid of the acetone residue. This is just for easily soluble organics. There are better cleans which can get the stuff that TCE and acetone can't get.

Hmmm..

Everything I've ever read says that pure acetone evaporates clean away. Are you sure the impurities you're seeing aren't introduced later?

I've gotta run some errands, but will come back to this with more googling.

It might have to do with moisture in the air (is all that comes to mind). You always get this cloudy film on silicon wafer when using acetone.

 

[silverpig]

Originally posted by: Eli

Originally posted by: silverpig

Originally posted by: Eli

Originally posted by: Tiamat
Yup, IPA strikes a great compromise for its cleaning strength while leaving no impurities on the surface. Acetone is a stronger cleaner, but leaves impurities on the surface of what was cleaned.

An experiment that I did during undergrad that I thought was cool was to freeze IPA in LN2. As the IPA approaches it's freezing point in LN2, the mixture turns into a very viscous liquid that is as thick as honey/molasses.

I think you're mistaken. Acetone should evaporate clean away, as long as the acetone is pure in the first place.

Xylene leaves impurities though.

Acetone DEFINITELY leaves a residue, and I get the CMOS grade stuff. If you put a wafer in acetone then let it evaporate it gets a film of crap all over it. Generally we clean in trichloroethylene, then acetone, then either IPA or methanol to get rid of the acetone residue. This is just for easily soluble organics. There are better cleans which can get the stuff that TCE and acetone can't get.

Hmmm..

Everything I've ever read says that pure acetone evaporates clean away. Are you sure the impurities you're seeing aren't introduced later?

I've gotta run some errands, but will come back to this with more googling.

Yep pretty sure. I've let acetone evaporate on a few silicon chips (with some SiO2 on them) in the class 10 wetbench in the cleanroom and it gets that crap on them. It happens whether you let it evaporate in air, in clean air, blow dry it under N2, or heat the acetone to bake it off. The residue is easily removed with more acetone, and then putting it into IPA/methanol though.

 

[Nik]

Originally posted by: StevenYoo

Originally posted by: Nik
Isopropyl and rock salt do wonders for cleaning glass.

rock salt is also great for shooting uma thurman

There has never been a hotter Poison Ivy. When Uma is all dolled up, she's faptastically bonerific.

 

[Atheus]

Originally posted by: Bateluer
I use my 70% stuff to burn papers in the sink.

oooooo k

 

[zinfamous]

Originally posted by: MegaVovaN
You can get 99% in same places as 91% and 70%...
BTW I do not think 99.9% is stable, it will absorb water from air and become less. Probably same applies to 99% and even 91%?

Another danger is that (reportedly) isopropyl tastes exactly like ethyl (regular), so you won't even notice that you are drinking poison.

same with all types of alcohol.

We regularly order 100% EtOH, but you must assume that as soon as you open the bottle, it's actually closer to 95%, as the absorption is so high.

as such, 100% is best aliquoted into 50mL conicals to reduce the absorption of your stock.

I'm not sure if isopropyl poisoning is the same as with methanol, but the interesting thing is that if you do ingest methyl, the first and best response is to ingest ethyl.

In fact, they'll hook you up to an ethanol IV in the emergency room. This is b/c ethanol is more readily metabolized by the body and as such will allow the methanol to pass through.

 

[zinfamous]

Originally posted by: StevenYoo

Originally posted by: Nik
Isopropyl and rock salt do wonders for cleaning glass.

rock salt is also great for shooting uma thurman

lol

 

[zinfamous]

Originally posted by: Nik

Originally posted by: StevenYoo

Originally posted by: Nik
Isopropyl and rock salt do wonders for cleaning glass.

rock salt is also great for shooting uma thurman

There has never been a hotter Poison Ivy. When Uma is all dolled up, she's faptastically bonerific.

so true. too bad B&R is so difficult to watch.

 

[Babbles]

Originally posted by: Tiamat

Originally posted by: Eli

Originally posted by: Tiamat
Yup, IPA strikes a great compromise for its cleaning strength while leaving no impurities on the surface. Acetone is a stronger cleaner, but leaves impurities on the surface of what was cleaned.

An experiment that I did during undergrad that I thought was cool was to freeze IPA in LN2. As the IPA approaches it's freezing point in LN2, the mixture turns into a very viscous liquid that is as thick as honey/molasses.

I think you're mistaken. Acetone should evaporate clean away, as long as the acetone is pure in the first place.

Xylene leaves impurities though.

I am not mistaken, and Xylene/Toluene are stronger solvents and do leave impurities. My experience is with silicon wafer degreasing and cleaning in preparation for ultra high vacuum (10E-11 torr) environments.

Generally for mild degreasing, it is good enough to start with acetone, then IPA, then EtOH, then methanol, then degassed DI 18Mohm water. This process allows for better than PPB surface impurity count which is necessary for ultra-high vacuum to be obtained in a timely fashion (hours instead of days).

In the presence of high flowing dry nitrogen, it is possible that acetone alone may not leave significant residue, however, for all intents and purposes, the multi-step graduated cleaning method is generally accepted by all surface scientists and surface chemists.


Looks like silverpig does exactly as I mentioned! I only had to use TCE once, and that was done with the silicon as received from the vender (and following RCA clean). Any other relatively clean manipulation of the substrate only required acetone as the lead solvent.

Stronger solvent is all relative. Xylenes and Toluene are aromatic and non-polar. As such they would be better solvents for cleaning aliphatic and aromatic messes . . . typical fuels and/or oils. Things like IPA or acetone are slightly polar and as such are better solvents for more polar compounds.

 

[Ika]

On a side note with acetone again, I once used it to clean up some Sharpie written on the back of my hoodie. Now there's no sign left and no damage apparent, pretty sweet.