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Post by Casethecorvetteman on Apr 2, 2016 3:21:32 GMT -5
From CUB or Lancer, check out their websites and email them, see if theyll sell it to you  |
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Post by tschaeikaei on Apr 10, 2016 10:29:49 GMT -5
You can get pure propyleneglycol on ebay or locally at electronic cigarette shops.
Electronic cigarettes use the stuff in medical grade purity, but it's a bit more expensive, about 10€ for 1 liter.
They also sell glycerin for about the same price (if you want to mix).
Glycerin also does not corrode anything and they're both safe, means they are allowed in food.
Very commonly used stuff.
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Post by Casethecorvetteman on Apr 10, 2016 10:37:19 GMT -5
You can get pure propyleneglycol on ebay or locally at electronic cigarette shops. Electronic cigarettes use the stuff in medical grade purity, but it's a bit more expensive, about 10€ for 1 liter. They also sell glycerin for about the same price (if you want to mix). Glycerin also does not corrode anything and they're both safe, means they are allowed in food. Very commonly used stuff. So far ive not seen any issue with straight propylene glycol, seems to do the job quite fine. What is that advantage to adding the other stuff? |
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Post by tschaeikaei on Apr 28, 2016 1:40:19 GMT -5
I don't know if it makes sense to mix PG and glycerine.
The projector manufacturers used to mix monoetylene glycol and glycerine.
Afaik to correct the refractive index and maybe make it less corrosive in comparison to pure MEG.
This doesn't apply to the PG automatically. Could be, but it is a totally different
material and you'll have to figure it out.
Anti-corrosive is surely out of the debate as PG is a very metal friendly material.
Sorry for the late answer, just saw it when randomly clicking through the forum.
Regards, Julian
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Post by Casethecorvetteman on Apr 28, 2016 7:52:41 GMT -5
No worries. After a few weeks there is still no issues, razor sharp focus right to the corners. I still have to fix this lens problem though.
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Post by tschaeikaei on Feb 18, 2018 7:44:33 GMT -5
Hey Case,
I'm thinking about using propylene glycol myself.
Is everything still fine with your projectors?
No discoloration so far?
The stuff should oxidize in sunlight (or other ultraviolet sources)
and turn into a deep brown mixture of different acids.
Question is... how much oxygen is needed for this and will it diffuse through the bellows?
Regards, Julian
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Post by stridsvognen on Feb 18, 2018 12:25:49 GMT -5
i was told VDC used triethyleneglycol with around 10% distilled water, if thats true it sure works better than all the rest, as the VDC build projectors seems to have no glycol issues, and have better optical performance. And its surposedly not agressive as ethyleneglycol.
I did put propyleneglycol in 2 tubes, as its easy to get, but that stuff turned yellow very fast.
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Post by tschaeikaei on Feb 18, 2018 14:36:10 GMT -5
Well, this is strange. I was told by a local guy (who did business with CRT projectors back in the day)
that he knows someone who uses PG since last year in his daily-used Marquee.
How can the stuff behave so differently.
Are you, stridsvognen 100% sure about the stuff? Housings were cleaned before the test?
How often was the projector used?
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Post by stridsvognen on Feb 18, 2018 14:46:10 GMT -5
i cleaned the housings, painted them with topcoat, new bellows, that was cleaned multiple times, and the projector was used a few times for testing, and left alone after this, a few months later i looked into the lenses and noticed the issue.. I also seen Marquee projectors filled with PG that developed fungus after less than 6 months, its seriously a shitshow, so when i have a original VDC build tube asembly i just keep my hands off the glycol, as i never seen any of those go bad.
I have filled one Marquee with the ice clear stuff, and it still looked fine after 1 year, that was a 2011 build Marquee, where we thought it had some coloration, wich i think later was a screen material issue efecting color uniformity more than usual.
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Post by Casethecorvetteman on Feb 18, 2018 16:24:42 GMT -5
Ive had no issues with poly glycol, it is still crystal clear and has not done anything untoward.
My projector is a Barco though, and ive not really heard of people having issues with glycol or housings on Barco machines.
My NECs and Sonys all have standard glycol in them and apart from the need to bleed the NECs if theyre not used regularly, there have not been issues there either. My Sonys are both VPH-1001QMs and neither have suffered from the frosty glycol issues they usually have, i dont know why that is. If they ever did, id remove the housings and convert them both into rear projection TVs, as both mine have forced line doubling video circuits that the Sony doesnt have.
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Post by stridsvognen on Feb 18, 2018 17:17:06 GMT -5
we might als need to take into concideration the glycol manufactures/ brands, might not have the same purity or quality, so the type of glycol alone might not be whats the biggest difference.
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Post by barclay66 on Feb 19, 2018 3:57:28 GMT -5
Hi,
More than two years ago, I prepared and refilled the tubes I have been using since on my Marquee. The stuff I used is from a local dealer (sells all sorts of paints and solvents for artistic painters). The tubes now have more than 7000 hours on them and there are no signs of corrosion, fungus or anything...
Kind Regards, barclay66 |
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Post by barclay66 on Feb 19, 2018 4:15:36 GMT -5
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Post by gjaky on Feb 19, 2018 15:28:40 GMT -5
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