Pro Tip: DIY Hand Sanitiser

[KaneTW]

100% IPA is worse than 70% IPA and more damaging to skin.

[nctnico]

A Dutch beer brewer got creative since they can't sell all of their beer at the moment and have to drain storage tanks allover the country. They distilled it and made hand sanitiser from the alcohol:

[helius]

Is it necessary to add water? 100% IPA can not kill virus?

It can, however the optimal time for disinfection is about 10 minutes, and 100% alcohol will evaporate before then. 50 to 70% is considered ideal because of the longer evaporation time.
A splash of more concentrated alcohol can be used to enhance the disinfecting properties of soap and water, since alcohol is miscible with water. This may not be the most efficient use of the alcohol (as soap is said to be sufficient when used correctly).

Many people have speculated on the discoveries/hobbies that might flourish during the stay-at-home period. But shortages of items like alcohol and gloves could frustrate those efforts, as well. I'm guessing not many asbestos abatement companies are working if they cannot acquire PPE. There are ripples throughout everything.

[Electro Detective]

Cringe Mode at the fear riddled gullibles at big stores,
pumping the public use sanitizer bottles with bare hands,
and some grab the bottle to pump out the booze.

If you want to catch someone else's 'mutating' pizza or kebab hand oil palmdemic, this is the way.. 

[ogden]

Cringe Mode at the fear riddled gullibites at big stores,
pumping the public use sanitizer bottles with bare hands,
and some grab the bottle to pump out the booze.

If you want to catch someone else's 'mutating' pizza or kebab hand oil palmdemic, this is the way.. 

If you are pumping without actually using sanitizer that comes out of the bottle - then yes indeed! 

[Domagoj T]

https://blog.gotopac.com/2017/05/15/why-is-70-isopropyl-alcohol-ipa-a-better-disinfectant-than-99-isopropanol-and-what-is-ipa-used-for/#Why_Is_70_the_Most_Effective_Concentration_of_Isopropyl_Alcohol_for_Disinfection

[DrG]

Is it necessary to add water? 100% IPA can not kill virus?

It can, however the optimal time for disinfection is about 10 minutes, and 100% alcohol will evaporate before then. 50 to 70% is considered ideal because of the longer evaporation time.
A splash of more concentrated alcohol can be used to enhance the disinfecting properties of soap and water, since alcohol is miscible with water. This may not be the most efficient use of the alcohol (as soap is said to be sufficient when used correctly).

Many people have speculated on the discoveries/hobbies that might flourish during the stay-at-home period. But shortages of items like alcohol and gloves could frustrate those efforts, as well. I'm guessing not many asbestos abatement companies are working if they cannot acquire PPE. There are ripples throughout everything.

"however the optimal time for disinfection is about 10 minutes"

What are you basing that on? Do you have a citation that is relevant for coronavirus?

For example, from here https://www.sciencedirect.com/science/article/pii/S0195670105000447 they tested various alcohol preparations and found all were effective against SARS-CoV [edit: by 30 seconds contact time]. Note that we are dealing with SARS-CoV2 but structurally, their relationship is close enough for reasonable generalization.

The results are shown in Table I. All four alcohol-based hand rubs led to inactivation of SARS-CoV to below the limit of detection (RF≥4.3, SD 0.5 to ≥5.5, SD 0.5), irrespective of the presence and type of organic load, within 30 s (Table I).

[plazma]

Shelves are full of isopropanol over here. You just have to buy it with different branding. I buy antifreeze for fuel or antifreeze for truck air brakes. MSDS says it's pure IPA.

[helius]

All four alcohol-based hand rubs led to inactivation of SARS-CoV to below the limit of detection (RF≥4.3, SD 0.5 to ≥5.5, SD 0.5), irrespective of the presence and type of organic load, within 30 s (Table I).

Surely that is consistent with what I said? It's standard engineering practice to use a safety margin of 10 to 20, particularly when the system's behavior is poorly understood. The limits on poisons in food and water are based on the same safety factors.

[Brumby]

For the general populace, if you say you need 10 minutes for effectiveness, people are going to be unimpressed and "uncooperative" to say the least.  A more practical time of 30 seconds has a much better chance of being followed ... and even then, there are those that will feel that is excessive.

Safety margins are one thing - but when you need mass engagement, it's better to put something more realistic in front of people or they will just say it's too hard.

[Electro Detective]

A table height mounted tub is a better idea IMHO, people just dunk their hands in and walk off rubbing them up,
no stuffing about handling slippery bottles and queue delays   

The person/s supervising in a big public places just have to top up the tub,
or toss out once it looks a bit murky**

The better go** is people should have clean hands to begin with before dunking, at an auto touchless scrub station beforehand,
then dunk into the booze/IPA

Job done   


and less IPA bottle theft by Chromers   

[ogden]

A table height mounted tub is a better idea IMHO, people just dunk their hands in and walk off rubbing them up,

Right. Other option: fountain of Ethanol. Preferably copy of _eeing Boy statue in Brussels. On serious note: there are loads of various automatic battery-operated hand sanitizers.

[Brumby]

A table height mounted tub is a better idea IMHO, people just dunk their hands in and walk off rubbing them up,
no stuffing about handling slippery bottles and queue delays

Don't like that idea - for four reasons:
1. People are going to complain about dunking their hands into something that other people have dunked their hands.  (The logic behind this is Cro-Magnon.)
2. The fumes are going to be a problem to many.
3. You're going to get the occasional idiot who will want to throw a lighted match into it for shits and giggles.
4. Loss through greater evaporation

[Brumby]

A table height mounted tub is a better idea IMHO, people just dunk their hands in and walk off rubbing them up,

Right. Other option: fountain of Ethanol.

Again, no.
From reason 2 above: Far worse fume hazard.
From reason 3 above: Let's go straight to the flamethrower!
From reason 4 above: Even faster evaporation.

[tanveerriaz]

Viruses can be active outside the body for hours, even days. Disinfectants, liquids, wipes, gels and creams containing alcohol are all useful at getting rid of them – but they are not quite as good as normal soap.

https://www.theguardian.com/commentisfree/2020/mar/12/science-soap-kills-coronavirus-alcohol-based-disinfectants

[ogden]

A table height mounted tub is a better idea IMHO, people just dunk their hands in and walk off rubbing them up,

Right. Other option: fountain of Ethanol.

Again, no.
From reason 2 above: Far worse fume hazard.
From reason 3 above: Let's go straight to the flamethrower!
From reason 4 above: Even faster evaporation.

Again, for those who do not get it: https://www.merriam-webster.com/dictionary/sarcasm

[SilverSolder]

A table height mounted tub is a better idea IMHO, people just dunk their hands in and walk off rubbing them up,

Right. Other option: fountain of Ethanol.

Again, no.
From reason 2 above: Far worse fume hazard.
From reason 3 above: Let's go straight to the flamethrower!
From reason 4 above: Even faster evaporation.

Again, for those who do not get it: https://www.merriam-webster.com/dictionary/sarcasm

After Brexit, Trump, etc., sarcasm is dead - reality blew it away.

[KaneTW]

It really is. Even the most absurd things turn out to be true at times.

[ogden]

It really is. Even the most absurd things turn out to be true at times.

It is sad that people forget/ignore what humor is even seeing direct clue "on serious note" following obviously absurd suggestion 

[Electro Detective]

FWIW: re previous suggestion "A table height mounted tub is a better idea IMHO, people just dunk their hands in and walk off rubbing them up"


whilst I agree with commenters' 'cons' about it, 

the 'pros' are that it speeds up the 'waiting to get in' queues,
therefore improves on the Social Distancing exposure times,
is optional to use and parked away from the regular bottles,
and supervised by a prepped staff member and or security person, as all/most places are currently 

[ogden]

the 'pros' are that it speeds up the 'waiting to get in' queues,

No need to reinvent the wheel by introducing screaming fire hazard in public place. Just install as many automatic hand sanitizers as needed. Depending on the model, dispense time of such is around 2-3 sec, quick enough.

[Brumby]

Again, for those who do not get it: https://www.merriam-webster.com/dictionary/sarcasm

Yeah, well, it isn't always obvious in a text based communication channel.

[c64]

A table height mounted tub is a better idea IMHO, people just dunk their hands in and walk off rubbing them up,

Right. Other option: fountain of Ethanol.

Both of them will not work. Ethanol will evaporate much faster than water - so the ratio alcohol / water will quickly drop below required level

[ogden]

A table height mounted tub is a better idea IMHO, people just dunk their hands in and walk off rubbing them up,

Right. Other option: fountain of Ethanol.

Both of them will not work. Ethanol will evaporate much faster than water - so the ratio alcohol / water will quickly drop below required level

LOL. This thread is like broken record:

Again, for those who do not get it: https://www.merriam-webster.com/dictionary/sarcasm

[Brumby]

LOL. This thread is like broken record:

It happens.

Not everybody actually reads a whole thread before posting.  Many who encounter a post that makes them want to make a point don't read the following posts to see if it has already been made.