CurtPalme.com Home Theater Forum

Ironman1965 · Joined: 28 Jun 2007 Posts: 98

I recently bought a bottle of Propylene Glycol USP 500ml and Glycerin USP 250ml at the local pharmacy for under $15.00 and this included a 450ml bottle to mix it in. For a syringe I went to the local farm supply store called UFA (most any should carry them, just call and find out) and got 35cc syringes (they were out of the 60cc) and needles for under $10.00. For XG tubes I had to settle with 18G needles as the 16D were too large to fit through the filler screw hole. Just my 2 cents worth.

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

I have two gallon jugs of glycol that I bought from Fisher Scientific a few years ago. I mix it with 30 percent glycerine as I'm about to
put it into the LC chamber.

It is moderately expensive but I know it's the right stuff for the job and when you consider the quantity, the price is actually just fine.

CJ

stefuel · Posted: Sat May 29, 2010 11:24 pm Post subject:

My coolant comes in the form of a 5th. Sometimes I use it straight. Other times, I'll mix it with something to get the desired effect Wink

Tom.W · Joined: 09 Mar 2006 Posts: 6637

Chip as I remember you said you used distilled water for coolant... Guess you didn't mention what you cut it with Wink

stefuel · Posted: Sun May 30, 2010 9:36 am Post subject:

Spanky Ham · Joined: 22 Mar 2006 Posts: 5643 Location: Comedy Central

I think the refraction indexes are about equal between the two. I might actually try out DI water. When I would put DI water in a bucket, it almost looked like there was nothing in it.

nateduffer

The more research I do to discover the correct glycol to have on hand for working on my G90, the more uncertain I become.

I've read all the threads I could find about this. Perhaps those of you with the most experience will share their latest thinking.

From what I've read it sounds like the Sonys have fewer problems than others with crud (snow flakes, "fungus", cloudiness, crystals, discoloration, etc) forming in the coolant. If that is actually true, maybe it would be best to keep the original Sony liquid clean, expose it to the air as briefly as possible, and then reuse it. I expect to hear that new coolant is preferred. But does anybody know for sure exactly what Sony put in there that lasts so well without problems?

Replacement choices I've identified are:

1) Ethylene glycol with about 30% glycerine added

2) Propylene glycol straight

3) Propylene glycol with glycerine

4) Tech Spray TV Coolant (which seems to be very similar to number 1)

Thanks in advance for any suggestions.

Nate

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Buy the Tech Spray TV Coolant.

Nashou

Das444 · Joined: 22 Dec 2006 Posts: 145

nateduffer,

When I retubed my Xg lc over a year ago I used Ice Clear. You can read about it here.

http://www.curtpalme.com/forum/viewtopic.php?p=322816

Dan

Tom.W · Joined: 09 Mar 2006 Posts: 6637

CIR Engineering

Spanky Ham · Joined: 22 Mar 2006 Posts: 5643 Location: Comedy Central

What is slightly less than clear?

I have a bottle of glycol from a G70 that has a slight yellowish tint. I was going to throw it away, but thought it would be good for something.

CIR Engineering · Posted: Sat Apr 13, 2013 2:03 pm Post subject:

nateduffer · Posted: Tue Apr 16, 2013 4:44 am Post subject: Thanks for the responses

Thanks for the input. It sounds like a consensus is forming for Tech Spray. I'm still curious if the idea that propylene glycol is less corrosive has enough merit for more consideration. But I tend to over analyze and seek certainty when learning new technical stuff, and often find that things turn out to be uncertain with lots of trade offs when better understood through experience.

N

nateduffer · Posted: Tue Apr 16, 2013 5:13 am Post subject: Ice Clear AF

I ran into some broken links looking for more information about Ice Clear. This one provided some details. The stuff seems to be glycerine.

http://orisonmarketing.com/IceclearAF.html

mc86 · Posted: Mon Apr 22, 2013 1:30 am Post subject:

Hi Guys -

Some of you may remember my semi-maniacal and largely academic foray into positively IDing the dyes used in the glycols on air coupled units.

I still plan to do a chemical analysis (GC) on the any glycols folks send me. I want to do this b/c the index of refraction measurements I took of the cooling fluids ("glycols") last year were very unexpected. That is, I removed the dyes found in the OEM mixtures in 07MS tubes taken from ampro, barco, and Ehome machines...in all cases the fluid was way more water than anticipated. As in, predominately water with minor % glycol - 10%vol, IIRC. The n value (index of refraction) doesn't matter in AC machines like it does your LC machines, tho'.

Anyway, Dave sent me some of the Iceclear stuff and I'll pickup some of Tech Spray. I have pure EG and some PGs for comparison. Incidentally, propylene glycols and glycerol/glycerine are super crazy hygroscopic. I know that within an hour of sitting open on a counter that pure gycercol will be as much as 10% percent water just via water from the atmosphere! The degradation folks have seen are inevitable from heat -- and accelerate if exposed to air and UV light. For example, this DOW paper briefly mentions this and has a bit of data. In a nutshell, don't open when you don't need to and definitely keep in the dark or wrap the bottles in foil. Given the impurities that are created by degradation, activated carbon or a carefully chosen zeolyte might selectively remove those impurities and maybe at less cost than buying anew.

I am SO optimistic about finally doing a lot of things with my ECPs this summer that even folks on here will find crazy. Wink

Trying to unbond tubes from a D50, dissolving silicone blocks in hvps, hd144 vs hd6 throws, blending 2 ECPs, dye vs tinted lenses, measuring tube face and glycol temps and possibly testing a cooling/filtering circuit, etc...

cheers,
Matt

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Your Crazy matt!!!!

I like it!!! Very Happy

Nashou

digitalayon · Joined: 02 Mar 2009 Posts: 921

Francisco · Joined: 05 Apr 2007 Posts: 305 Location: The Netherlands

Hi Guys,

I'm bringing this old topic up again. I'm about to mix new glycol for my P19 LUG tubes in Barco LC chambers.
Now I think Barco used a mixture of Ethylene glycol 70% with 30% glycerine.

My question is what should I use, Propylene glycol 70% with 30% glycerine or the original more toxic one Ethylene?

Some say they have the same breaking index and that Propylene glycol is less fluid/ thicker viscosity (which is not a problem to get in a Barco LC chamber)

I'm hoping for a chemical glycol expert to chime in here Very Happy

**Curt Palme** · Posted: Tue Apr 01, 2014 12:39 am Post subject:

BTW, I'll add here.. I still have about 20 red tubes, SD187, etc that have tinted glycol in them. It won't work for LC tubes, but if you want to tint an AC tube you have, I'll give away these tubes. Cover shipping only. If you want me to spend the time draining the glycol, I'll have to charge for my time...