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fog juice combusting at higher temperatures?

7002 Views 14 Replies 7 Participants Last post by  Blarghity
I've been trying to find information on this because I've seen this happen two years in a row now. Like many here on the forum, I store my fog machines with a bit of fluid in them every year. Two years ago one of my machines leaked out fluid in one of my storage boxes, and the fluid ended up soaking into the cheap fabric (probably polyester) connected to a hanging reaper. The foggers are stored in offsite storage without temperature control in Southern California. Where I live it rarely gets hotter than 80 degrees. Anyway, last year I opened the storage box with the fogger and found small unmistakeable burn marks all over the reaper's fabric. There were no burn marks in the sections of the reaper fabric that did not get soaked with fog fluid. That was surprising to me, but I thought maybe it was a combination of factors that caused the burn marks. Fast forward to this year. I stored my foggers the same way on Nov. 1st 2013. I open the boxes just last week and find that one of the oem plastic fog juice containers that sits in my fogger has a 1/2 inch black burn hole that developed right in the bottom corner that allowed the fog juice to leak all over the box. This hole could not have been there before I put the fogger in storage for the year because the size would have allowed the fog juice to immediately leak out. I would never have missed it. My guess is that the fog heats up to a high temperature in the storage box (and especially in the metal casing of the fog machine) and then somehow eats away or burns through plastic and fabric. This really alarms me, but I haven't heard anyone else talking about this. Obviously fog has been deemed safe when it's heated up and put out into the air, but I'm surprised that it can perhaps combust or at least dissolve particular materials if left sitting in high temperatures for a long time. Anyone else experienced this phenomenon? I know it's not a fluke because I've seen it happen with my own eyes on two separate occasions, in two separate fog machines, over two different years, and using two different fog fluid suppliers. :eek:
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· Human Candy Shovel
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There is another option besides combustion. You are putting this stuff in offsite storage, I assume some sort of rental unit. Maybe the place has vermin,which would be drawn to the fog juice the same way they'd be drawn to the highly toxic ethylene glycol still found in many car antifreeze brands. Once the fluid leaks, and is exposed to filthy vermin, it would decompose naturally and produce the staining you're seeing on the reaper.

Incidentally,I blame left over fog juice for a rodent infestation in my garage about 8 years ago. They go after partially used containers, but I've never seen them damage any full and still sealed containers.
 

· Human Candy Shovel
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Yes, fog juice evaporates to an extent. In fact, for the most part, the glycols used in it tend to actually evaporate faster than water. But there are still materials left behind once the glycols and water evaporate, leaving a residue described as oily or sticky depending on what was left behind. perhaps this residue reacted with the cheap artificial fabric of the reaper.
 

· Human Candy Shovel
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If fog juice is combustible, wouldn't it explode being heated inside the fogger itself?
It is combustible, just not at the temperatures a fogger works at. However, for years there have been warnings that a very limited level of combustion occurs in foggers, creating a number of toxic and carcinogenic byproduct compounds. The main byproduct to worry about is acrylamide. However,we consume far more of that in fried, grilled and baked foods than we'll ever inhale from vaporized fog juice.
 

· Human Candy Shovel
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So given that fog juice does combust at high temperatures, I wonder what temperature is needed to get it to that point?
You'd have to distill it down to the flammable components, in particular whatever glycols were used in the particular formula and attempt to ignite those. The flash point for pure glycerine is 349F while ethylene glycol is 770F and propylene glycol is 710F.
 
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