cCell Cleaning Update:
My Kanthal cCell was too badly damaged after all the water in the pot boiled out. Both the White Grommet for the Plus Pin Insulation and the clear Silicone Spacer on top of the Ceramic (inside) were too badly damaged to be used. (I didn't know about the clear Silicone Spacer on top until I took the cCell apart) I tried to work with the Coil Legs to get the other White Grommet and Plus Pin installed, but one of the Legs broke off. However... this cCell came apart without having to cut it apart. So I have two things to tell you.
- The Ceramic looked pristine!!! Perfectly white again. And it looks very good inside where the coil is.
- I believe now that a cCell Head could be rebuilt by using a Vertical Coil wrapped with strips from a pad of Japanese Cotton.
Discussion:
Cleaning
The Cleaning process worked to get the Ceramic very good looking.
I say "
very good looking" because I don't know if the Ceramic's integrity was damaged, but this one got way too hot in the pot on the stove, too. However, it is still a solid mass of cylindrical ceramic. There is no powder, dust, grit, or debris that I can find, but I am not analyzing it with a microscope or doing anything scientific, either. Just inspecting it as best I can visually and manually. I scratched it with the same sharp tool as before, and it did not flake, crumble, or show anything to indicate any damage at all.
Which part of the process worked to accomplish the most? The PGA bath or the boiling?
Since I only had the one Ni200 cCell to work with and ruined it, I cannot say. It was not cleaned well enough by only the one 2-day PGA bath. I don't know how well only boiling it without the PGA bath first would have worked, either.
Would I try this again?
Absolutely. My intention was to boil it for 10 minutes after the PGA bath and repeat as necessary. I would also try cleaning by only boiling to see how many times that might take. I used Filtered Water, not Distilled, and Distilled would be even safer to use. But you have to know that store-bought Distilled Water is not as pure as water you distill yourself, for several reasons, though it would be much better than tap water, and maybe even better than filtered water... depending on the filtration system. A three-stage RO Filtration System (Reverse Osmosis) is 2nd best to freshly Distilled. If stored for future use, either one should be stored in glass, if possible, and kept in a cool, dry place, and I would think out of direct Sunlight. Most typical plastic containers can leech particles into the stored water.
Rebuilding
What I learned from this failed cleaning attempt is that a cCell can be disassembled to the point of being able to rebuild it, without damaging the structure of the metal Head.
The coil legs leave the Ceramic from opposite sides of the cylinder. One from near the top and the other from near the bottom, and both go downward. The Fibrous Material wraps around them and also helps to insulate them from the metal shell around it. So it does
three things. This insulation was not mentioned by Vaporesso in the QC document, but I guess it's not really a "QC" issue.
My cotton (if you will, for simplicity's sake) was burned when the pot boiled all the water out, and the cotton and ceramics were both dry. I had put cold tap water in the pot to cool it off, but taking the cCell apart was done much later. The cotton peeled away from the ceramic very easily after the ceramic came out, but it was much thinner from being burnt. They both came out easily by pulling on a coil leg. (It was a very different experience when they were both wet.) The press-fit metal ring that the White Grommet and Plus Pin fit into has a very short ledge/lip inside that the ceramic and cotton wrap sit on.
The "lip" appears to block cotton wrap and hold the assembled ceramic and cotton inside. They are inserted first, and then the ring is press-fit into place. But this press-fit ring does not have to be removed to get the ceramic out. The ceramic may have to be pushed forcefully on a used and damp cCell to get it out, but it's bad anyway and being replaced, so any minor damage to it shouldn't matter to you, as any debris from that can be washed off. If the cotton gets damaged, that won't matter either.
The clear silicone spacer at the top will have to stay inside (unless you destroy it). Mine was damaged so I removed it, but it's inside diameter hole is slightly larger than the hole in the cCell's air hole that stops it. The air hole in the ceramic cylinder is a good bit smaller, so a tool (like a drill hit) with a fairly flat end can be used to push the ceramic out through the press-fit ring. If the cotton stays inside, it can then be removed, as can the clear silicone spacer, if desired.
Once the center chamber is emptied and cleaned, a rebuild Vertical Coil can be inserted. If the cotton wrap is fluffy enough to be thicker than needed, it can be compressed a little to get it past that "lip". Since this one came apart without cutting it open, I am soaking it in PGA to clean it now.
I will go for another Ni200 coil at 3mm ID and use a Blue Box Japanese Cotton pad to wrap it. I have used this procedure to make other vertical builds in RBA Heads and it worked great, but they were made to be rebuilt, so this will only be a little different, to make sure the cotton wrap is fluffy enough to expand inside and fill the four large juice holes.
What I intend to do is leave the coil leg that exists the top on the outside of the cotton and make it ground. The metal shell of the casing should ground it near the top of the coil and help make the intended coil resistance better without using a NR-R-NR wire weld. And since it
should be grounded near the top of the coil, that long leg should not get hot as part of the TC process. The same would be true of Kanthal, or anything else. That long leg's addition resistance to the total resistance of the coil should be terminated very near the coil. The positive leg will leave the coil going straight down and be terminated near the coil by the Plus Pin. This way, there should be no issues with the legs shorting in the assembled rebuild. The legs will still leave the coil from opposite sides to help accommodate that near the Plus Pin. The working leg lengths should also be very short this way.
So this is what I learned from my failed attempt to clean it. They do appear to be cleanable to clear them well and reuse them for a fair amount of time. And then they can be rebuilt, if you are so inclined. I'll let you know how well it works for me after I rebuild it and use it for a while.
Any and all discussion is welcome.
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