High boiling point liquid

It would help if you could explain why 130 C is important. Is this a safety requirement, a mandatory requirement? There are substances with greater boiling points but none I can think of that are going to be suitable for you usage.

If the system being tested can contain pressures in excess of 1.7BarG, one could use dihydrogen monoxide.

http://www.simetric.co.uk/si_steam.htm

Is that a posh chemists way of saying water?

Mercury is a liquid that meets your boiling point requirements. It is extra heavy and mercury vapour is toxic. It may not indicate the leaks as well as water, if that is what you are trying to do, as it has a different viscosity and molecular size.

propylene glycol or dipropylene glycol will work and boil higher.

ethylene glycols are toxic, propylene glycols are not

http://www.raypak.com/afreeze.htm

http://www.chemicalland21.com/industrialchem/organic/DIPROPYLENE%20GLYCOL.htm

http://en.wikipedia.org/wiki/Diethylene_glycol

have you not heard of the DMRD (Dihydrogen Monoxide Research Division)?

Check this out for a moment of jolity.

http://www.dhmo.org/

Yes I saw it some time ago but they watered down the facts.

Do you have any recommendations as to achieve this i.e. a new working fluid etc higher boiling point(150 degrees C or more)?

The simplest way is to increase the pressure on closed systems with glycol:water mixtures.

Isn't this the real world application for such mixtures?

What are you testing for? Thermal failure? How about an oil or similar non-aqueous fluid?

I believe a silicon type liquid is available but expensive , its used in high temp. Baths for calibration of Temp. instruments like temp. switches. What about vegetable cooking oils?

Mbhele,

You do not say what radiators you are testing but you do say Durban.Could it be the Toyota plant or the old smiths.Knowing more would assist me as I do this in the radiator field every day.A 15lbs pressure cap would get your water to a higher temp and then a mixture of prop and water 50:50 might get it close.Toyota use the nippy or small pressure cap 13lbs or .9kpa so I am not aware of any manufacture that makes a nippy with a higher pressure.As you are doing the pulse testing why not use air pressure to get to the high pressure.I am very interested in why you want 130 deg would you give me an idea.

best

robert ferreiro

robert_sagoo@africaonline.co.ke

Glycerin water mixtures are higher boiling and do not seem to break down as fast as the glycols. I am assuming you are using a buffer and anticorrosive in your current mix.

if you intend to utilize 'antifreeze' solution --ethylene glycol and water--which you probably do since those are the actual service fluids and have a low surface tension, then using a 70% EG, 30% water mixture, AND 15 PSIG system pressure will allow temperatures above 265F before any boiling. I believe your target temp of 130C is about 266F. You cannot achieve this temperature with any EG:water solution without the 15 PSIG system pressure.

How many gal. do you need?

I have heat transfer oil. Air Craft Quality.

Tom Silver

800 862 4328 Monday