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Why Not Propylene Glycol Coolant?

post #1 of 12
Thread Starter 


Call it coolant, antifreeze, or whatever you'd like; sure, it has abilities that far exceed the demands of computer cooling, but a low-toxicity version seems like the rather perfect liquid for our usage. Heck, this is directly from Corsair:

"The liquid inside our Hydro Series CPU coolers is a mixture of distilled water with Propylene Glycol added to prevent corrosion and organic build-up."

Outside of just wanting to be different, or needing to run a proprietary mixture for warranty purposes, is there any legitimate reason (based in fact, folks) that one shouldn't pick up a jug of Prestone LowTox & distilled water from the local store?
post #2 of 12
Ethylene glycol is best imo.

Propylene glycol, on the other hand, is considerably less toxic and may be labeled as "non-toxic antifreeze". It is used as antifreeze where ethylene glycol would be inappropriate, such as in food-processing systems or in water pipes in homes where incidental ingestion may be possible.
Propylene glycol oxidizes when exposed to air and heat, forming lactic acid. If not properly inhibited, this fluid can be very corrosive, so pH buffering agents are often added to propylene glycol, to prevent acidic corrosion of metal components.
Besides cooling system breakdown, biological fouling also occurs. Once bacterial slime starts, the corrosion rate of the system increases. Maintenance of systems using glycol solution includes regular monitoring of freeze protection, pH, specific gravity, inhibitor level, color, and biological contamination.
Propylene glycol should be replaced when it turns a reddish color.

source
Edited by DirectOverkill - 10/20/11 at 12:11pm
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post #3 of 12
Thread Starter 
Quote:
Originally Posted by DirectOverkill View Post
If not properly inhibited, this fluid can be very corrosive
Among others, Prestone LowTox meets the following:

ASTM D 1384 "Standard Test Method for Corrosion Test for Engine Coolants in Glassware"
ASTM D 4340 "Standard Test Method for Corrosion of Cast Aluminum Alloys in Engine Coolants Under Heat-Rejecting Conditions"
ASTM D 2570 "Standard Test Method for Simulated Service Corrosion Testing of Engine Coolants"
ASTM D 2809 "Standard Test Method for Cavitation Corrosion and Erosion-Corrosion Characteristics of Aluminum Pumps With Engine Coolants"
GM 1899M
GM 1825

I'm not the least bit concerned with its protection against corrosion.
post #4 of 12
^ Sounds good.
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post #5 of 12
The only reason to use it is if you are running a chilled water setup or have the rad outside in sub zero temps.
 
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post #6 of 12
Lower specific heat capacity than straight HOH

00% 1.000
10% 0.980
20% 0.960
30% 0.935
40% 0.895
50% 0.850
60% 0.805

but 10/20% solution would probably give you the protection you want withough giving up too much efficiency. I run 10% water wetter myself.
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post #7 of 12
Thread Starter 
Quote:
Originally Posted by fat_italian_stallion View Post
The only reason to use it is if you are running a chilled water setup or have the rad outside in sub zero temps.
Really? How many pages of threads have we seen about corrosion; maybe running a coolant such as this from the get-go would have prevented those issues...food for thought.

Quote:
Originally Posted by wimcle View Post
Lower specific heat capacity than straight HOH

00% 1.000
10% 0.980
20% 0.960
30% 0.935
40% 0.895
50% 0.850
60% 0.805

but 10/20% solution would probably give you the protection you want withough giving up too much efficiency. I run 10% water wetter myself.
Hmm, how's the WaterWetter working for you? Regarding your hypothesis on specific heat capacity as it relates to performance:



Discuss.
Edited by jlells01 - 10/20/11 at 4:23pm
post #8 of 12
Quote:
Originally Posted by jlells01 View Post
Really? How many pages of threads have we seen about corrosion; maybe running a coolant such as this from the get-go would have prevented those issues...food for thought.

First of all you shouldn't really have any corrosion issues with your loop unless you're running aluminum parts. People think their blocks are corroding when it's really the nickel plating flaking off from being poorly plated. It'll look like this



Not



If you run all copper/nickel/gold/silver blocks there won't be corrosion, or any within the period of actually owning the computer so no reason to run propylene glycol other than if running in sub zero temps, chilled loop, or instead of a biocide.
 
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post #9 of 12
Wishful thinking about aluminum only causing corrosion.
There is even microbial corrosion on metal in existance. Do some reading! This is a severe problem and still ppl think it has nothing to do with their belongins when simply neglecting basics?
Attachment 235075
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post #10 of 12
Quote:
Originally Posted by DirectOverkill View Post
Wishful thinking about aluminum only causing corrosion.
There is even microbial corrosion on metal in existance. Do some reading! This is a severe problem and still ppl think it has nothing to do with their belongins when simply neglecting basics?
Attachment 235075
Wow thats nasty
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