Electronics > Beginners
Cheapest way to make up to 99% pure isopropanol
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macboy:
Here in Canada, I buy 99% IPA at Costco. Last time it was $9.99 for four 500 mL bottles ($10 / 2 liters), but I think the price is up to around $12 now. Still super cheap and super easy. 
Cliff Matthews:

--- Quote from: macboy on July 16, 2019, 04:39:26 pm ---Here in Canada, I buy 99% IPA at Costco. Last time it was $9.99 for four 500 mL bottles ($10 / 2 liters), but I think the price is up to around $12 now. Still super cheap and super easy.

--- End quote ---
Thanks, my friend is a member. Walmart wants 6.99 CDN / 500ml and it must be ordered (18+ 'over the counter').
rcbuck:
I buy 32 oz 91% Isopropyl Alcohol at Wally World for $2.50. I buy it for disinfectant purposes but also use it for cleaning PCBs.
Beamin:

--- Quote from: rcbuck on July 16, 2019, 06:17:46 pm ---I buy 32 oz 91% Isopropyl Alcohol at Wally World for $2.50. I buy it for disinfectant purposes but also use it for cleaning PCBs.

--- End quote ---


91% isn't nearly as good as 70% which kills 99.99% of germs vs about 70% killed, for the 91%. The alcohol has to get into the cells so that's why less is better. The peptoglycan wall of the bacteria is not oil or alcohol soluble so only that 9% alcohol with 5% water gets in. Also remember the bacteria doesn't die until full dryness.
Smoky:
This stuff works very well. I bought it on Ebay. It's $8 for one gallon, you get four quarts. $12 to ship :)

It works very well and leaves no residue.



But most of the cleaning I do when soldering is Dupont 105 lacquer thinner. I have a five gallon can in the garage!
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