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Rubbing alcohol expires???

Old 07-27-21, 10:46 AM
  #1  
genec
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Rubbing alcohol expires???

I have some bottles of "rubbing alcohol" around the house... for various reasons.... medical, solvent, cleaning... etc.

Well I just noticed one bottle had "expired." Dated 8/2020. 70% Isopropyl Alcohol in plastic bottles.

Expiration dates... really?

Maybe it absorbs water over time???
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Old 07-27-21, 10:58 AM
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I keep a bottle with my bike tools to clean rims etc etc applying bar tape, rim tape stuff like that.
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Old 07-27-21, 11:10 AM
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Originally Posted by genec View Post

Maybe it absorbs water over time???
No, it evaporates and just leaves behind the water. Nothing to worry about, all medical stuff has to have an expiration date. If you're not counting on 70%abv for some kind of lab experiment it won't matter.
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Old 07-27-21, 11:33 AM
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Originally Posted by DiabloScott View Post
No, it evaporates and just leaves behind the water. Nothing to worry about, all medical stuff has to have an expiration date. If you're not counting on 70%abv for some kind of lab experiment it won't matter.

Of course... did not think about evaporation... every time the little cap is opened... however slight. So those cases I have on the back shelf in the bomb shelter, that have never been opened... they are OK.
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Old 07-27-21, 01:34 PM
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3% hydrogen peroxide has stabilizers, so any expiration dates on that maybe valid. i have had rubbing alcohol on the shelf for years
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Old 07-27-21, 02:16 PM
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Originally Posted by thook View Post
3% hydrogen peroxide has stabilizers, so any expiration dates on that maybe valid. i have had rubbing alcohol on the shelf for years
Yeah, peroxide goes "flat" if it is around too long... Doesn't foam up at wounds like it should.
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Old 07-27-21, 05:44 PM
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I was told once that old peroxide simply turns into water with time... would have to research this to verify.
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Old 07-27-21, 05:50 PM
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This thread reminds me of the Monkey Blood the school nurse put on our scrapes dang it burned lol. I forgot everything I learned from the one chemistry course I took lol.
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Old 07-27-21, 05:52 PM
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Old 07-27-21, 05:54 PM
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Originally Posted by Hondo Gravel View Post
This thread reminds me of the Monkey Blood the school nurse put on our scrapes dang it burned lol.
Remember Bactine?

Kids who ran home crying with scraped knees would run back out of the house, crying even louder at the sight of Mom with her spray-can of Bactine.
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Old 07-27-21, 05:59 PM
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Originally Posted by Squeeze View Post
Remember Bactine?

Kids who ran home crying with scraped knees would run back out of the house, crying even louder at the sight of Mom with her spray-can of Bactine.
Growing up on a cattle ranch if it was something grandma was going to spray you with you knew it was going to burn like fire. She would say shut up quit being a sissy it ainít that bad
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Old 07-27-21, 06:02 PM
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Originally Posted by Kat12 View Post
I was told once that old peroxide simply turns into water with time... would have to research this to verify.
just about...except there's still residue of the stabilizer. peroxide is H2O2...so water with an extra oxygen molecule, but the extra molecule is not a stable bond for long periods.
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Old 07-27-21, 06:04 PM
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Originally Posted by Squeeze View Post
is that what you use on your wounds?
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Old 07-27-21, 06:21 PM
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Originally Posted by Squeeze View Post
Remember Bactine?

Kids who ran home crying with scraped knees would run back out of the house, crying even louder at the sight of Mom with her spray-can of Bactine.
hahaha....oh god yes! i was about 14 (mid 1980's) and staying at my grandmother's lake cabin for the summer. her cabin was the first one entering down the steep hill into the lakefront community. and, that hill bottomed out at the first boat ramp adjacent to the levy. they'd just laid new asphalt, so of course i had to try it out with my skateboard. half way down at break neck speed, i hit a pebble. all skinned up and nearly blacked out from the pain. and, of course, grandma put bactine on it
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Old 07-27-21, 06:23 PM
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Nothing like good ole mercurochrome. Mercury kills anything
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Old 07-28-21, 06:41 AM
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Originally Posted by thook View Post
hahaha....oh god yes! i was about 14 (mid 1980's) and staying at my grandmother's lake cabin for the summer. her cabin was the first one entering down the steep hill into the lakefront community. and, that hill bottomed out at the first boat ramp adjacent to the levy. they'd just laid new asphalt, so of course i had to try it out with my skateboard. half way down at break neck speed, i hit a pebble. all skinned up and nearly blacked out from the pain. and, of course, grandma put bactine on it
O...M...G yes. My mom used that on me once when I was a kid. Once. She kept saying, "But it has a topical anesthetic! It shouldn't hurt!" Like hell!
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Old 07-28-21, 03:01 PM
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Originally Posted by Squeeze View Post
"pure, hand-mined salt", i.e. the product of laborers who have LITERALLY BEEN SENT TO THE SALT MINES
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Old 07-28-21, 03:31 PM
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Originally Posted by DiabloScott View Post
No, it evaporates and just leaves behind the water. Nothing to worry about, all medical stuff has to have an expiration date. If you're not counting on 70%abv for some kind of lab experiment it won't matter.
I'd never clean my bike with 69% alcohol. Only fresh 70% (or better) alcohol.
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Old 07-28-21, 04:19 PM
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Originally Posted by Squeeze View Post
Remember Bactine?

Kids who ran home crying with scraped knees would run back out of the house, crying even louder at the sight of Mom with her spray-can of Bactine.
Blue-Kote?
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Old 07-28-21, 04:29 PM
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After opening you will lose about one rub per month.
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Old 07-28-21, 04:56 PM
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Originally Posted by RubeRad View Post
"pure, hand-mined salt", i.e. the product of laborers who have LITERALLY BEEN SENT TO THE SALT MINES
That stuff is so good though. Probably the tears of the marginalized workers that give it that je ne sais quoa.
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Old 07-28-21, 05:23 PM
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Which means vegans can't have it, because it's the product of animal suffering.

(Adapted from original joke: why can't vegans cry in their beer?)
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Old 07-28-21, 07:55 PM
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Anything that can hold 140 proof alcohol is gonna die pretty soon anyway.

Interestingly, adding table salt to isopropyl alcohol separates the water and alcohol. I suppose if we have another shortage of isopropyl alcohol in which only the 50% is available -- too weak to be considered a reliable disinfectant -- it would be possible to make a stronger alcoholic concentration by adding salt.


Last edited by canklecat; 07-28-21 at 08:04 PM.
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Old 07-29-21, 06:04 AM
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Originally Posted by RubeRad View Post
Which means vegans can't have it, because it's the product of animal suffering.

(Adapted from original joke: why can't vegans cry in their beer?)
But what if the miners enjoyed their work?
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Old 07-29-21, 12:24 PM
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For all you kids whining about how much Bactine stings... I was 4 or 5 years old when my parents discovered Bactine in the early- to mid-1960s, and I can tell you that Bactine was a godsend, infinitely preferable to the alternatives Mom & Dad kept in the medicine cabinet prior to that. Pretty sure we mostly used Merthiolate prior to Bactine. I would happily slather a body full of deep open wounds with a tub full of Bactine rather than have to endure a single drop of Merthiolate on a simple cut or scrape.
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