Printech Archive
Re: Isopropyl Alcohol solution flashpoint

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From: SSchuler (
Date: Wed Sep 01 1999 - 10:01:24 CDT

I posed this question to a local Twin Cities solvent manufacturer
several years ago. Their chemist sent me some information on this
subject that may prove useful to you. I had to dig deep into my files
to find it for you so you owe me now. :-)

Please note that this information is taken from the October 1981 issue
of Modern Paint and Coatings. Using a Setaflash flash point measurement
instrument which "agrees quite well with Tag closed cup values," they
identified the following flash points of the following concentrations of
IPA/Water mixtures:

5% IPA/95% water = 118.5 degrees F
10% IPA/90% water = 98.0 degrees F
20% IPA/80% water = 82.5 degrees F

My other sources indicate that the flash point of 100% IPA is between
53-55 degrees F using a Tag closed cup tester.

This local Twin Cities solvent manufacturer chemist also tested a sample
of fountain solution as used on a litho sheet fed press containing 10%
IPA as verified by a gas chromatograph and found the mixture of water,
IPA, gum arabic, etc and found it to have a flash point of 180 degrees
F. They used a Koehler Model #K14600 Tag Closed Cup Flash Tester that
conformed to ASTM D56 whatever that means.

After all the digging in my files, I hope you find this information
useful. You may also be able to find this information in the latest
edition of the Handbook of Chemistry & Physics

-----Original Message-----
From: Robert Gifford []
Sent: Tuesday, August 31, 1999 5:33 PM
Subject: Isopropyl Alcohol solution flashpoint

------- Forwarded Message Follows -------
From: Dennis McCoy <>

Does anyone have any information on the flash point of IPA solutions in
water for the range of 0 to 10%? I was hoping to find a chart that
would have a curve of at least a chart of values for like 1%, 5%, 10% by
weight, first choice, but I guess I cant be picky! I thought this would
be addressed in the printreg forum but Wayne Pferdehirt suggested that
this was the more appropriate forum.

Thanks in advance for any help!

Dennis McCoy
Printing Industries Association of the Heartland

Robert Gifford
Printers' National Environmental Assistance Center, and
Univ. of Wisconsin - Extension
Solid and Hazardous Waste Education Center
610 Langdon St., rm 531
Madison WI, 53703
Voice: 608-262-1083 Fax: 608-262-6250

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