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marcus hopkins

  • Posts: 96
isopropanol
« on: January 03, 2010, 09:36:59 pm »
I am sure this has been discussed many times but i am unclear of the exact details from my readings.
Does anyone know the exact ratio of isopropanol to water mix?
I have read different answers, some even conflict with themselves lol.
I have read on Robinsons solutions


http://robinson-solutions.blogspot.com/2008/12/isopropanol-window-cleaner-in-winter.html


that the ratio is 1liter to 650 liters of water, but the chart on the same page equates to 10% meaning 65liters to 650 liters of water.
Will this still leave the windows spot free?

Any help will be very much appreciated.

Marcus

macmac

Re: isopropanol
« Reply #1 on: January 03, 2010, 09:41:50 pm »
I would be more concerned with the cost of 65ltrs of the stuff!!

Jeff Brimble

  • Posts: 4347
Re: isopropanol
« Reply #2 on: January 03, 2010, 09:42:47 pm »
Iso is an alchohol that evaporates from the glass and leaves absolutely no residue. It rises to the top of any tank and layers unless you stir it constantly, I suggest a simple bypass, doing this helps reduce the ammount needed.

marcus hopkins

  • Posts: 96
Re: isopropanol
« Reply #3 on: January 03, 2010, 09:45:39 pm »
Any idea of the mix ratio though?
I have got a price from litho supplies of £21 a drum unless anyone knows of a better supplier?

Jeff Brimble

  • Posts: 4347
Re: isopropanol
« Reply #4 on: January 03, 2010, 09:48:11 pm »
No I just guess but it depends a lot on what temp you want to protect to, if its lower than minus 2-3 forget it and stay home, the bristles freeze anyway.

Jeff Brimble

  • Posts: 4347
Re: isopropanol
« Reply #5 on: January 03, 2010, 09:49:07 pm »
20ml to 10L @ minus 2, stir well.

Nathanael Jones

  • Posts: 5596
Re: isopropanol
« Reply #6 on: January 03, 2010, 09:49:32 pm »
Mix for extra cleaning power is 1:100
Mix for anti freeze is 1:10 at -4 deg Celsius

matt

Re: isopropanol
« Reply #7 on: January 03, 2010, 09:50:08 pm »
didnt people discuss the health issues of spraying it around and it being a fine mist coming off the glass ? ? ?

which is a concern

macmac

Re: isopropanol
« Reply #8 on: January 03, 2010, 09:52:18 pm »
didnt people discuss the health issues of spraying it around and it being a fine mist coming off the glass ? ? ?

which is a concern

Yeah, p*ssed as a fart after the first job!! ;)

marcus hopkins

  • Posts: 96
Re: isopropanol
« Reply #9 on: January 03, 2010, 09:53:25 pm »
Interesting argument Matt  :o never gave that one a thought.
So basically in the temperatures we have at the moment the mix is 10% for it to act as an antifreeze.
:(