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DRY CELL QUESTION
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BroBob1 Offline
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Post: #1
DRY CELL QUESTION
I've constructed a Dry Cell using 1/2" thick Lexan with 1/4" pipe thread for the inlet and outlet fittings. I have 5 "SS" plates, 1 Positive, 3 neutrals, 1 Negative. My problem is that after running the cell during testing I noticed the Lexan "CRACKING OUT" from the 1/4" inch fittings Sad

So I made up some new 1/2" Lexan end plates ( I happen to have a good size section of this material) and I tried a straight 5/8- 18 TPI fitting and the same thing is happening Mad Is there any chance that this 1/2" Lexan is usable, or should I try some other material? Any sugestions would be much appreciated Big Grin
04-26-2009 08:13 AM
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umim Offline
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RE: DRY CELL QUESTION
I'm using 3/8" Lexan for one end plate and HDPE (white) for other end plate. My out/in barb connection are located on that HDPE plate. It works OK.
04-26-2009 08:50 AM
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BroBob1 Offline
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RE: DRY CELL QUESTION
(04-26-2009 08:50 AM)umim Wrote:  I'm using 3/8" Lexan for one end plate and HDPE (white) for other end plate. My out/in barb connection are located on that HDPE plate. It works OK.

And that works well? Where did you get the HDPE (white)?
Thanks BM
04-26-2009 09:18 AM
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umim Offline
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RE: DRY CELL QUESTION
It works. HDPE is about same material as your kitchen cutting board. Just buy one and cut it.
04-26-2009 11:19 AM
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BroBob1 Offline
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RE: DRY CELL QUESTION
(04-26-2009 11:19 AM)umim Wrote:  It works. HDPE is about same material as your kitchen cutting board. Just buy one and cut it.

Thanks!
04-26-2009 02:24 PM
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colchiro Offline
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RE: DRY CELL QUESTION
Cracking has been a big problem with most clear plastics.

Rick

Links: Documents / Tuning for Mileage | Toyota Sensors | Autoshop Sensor Tutorials
04-26-2009 02:52 PM
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striker273 Offline
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RE: DRY CELL QUESTION
(04-26-2009 02:52 PM)colchiro Wrote:  Cracking has been a big problem with most clear plastics.

I've been using 1/2" lexan for about 8 months without any problem. Make sure you use a pipe thread tap it's different than SAE thread it's tapered. There is too much stress on an SAE thread which causes the cracking.

1999 Honda Civic Lx.
1.6 liter
21 plate 4"x4" dry cell
single efie
1 lpm @ 19 amps
NaOH electrolyte
04-26-2009 05:08 PM
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colchiro Offline
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RE: DRY CELL QUESTION
The threaded holes are often a problem and the source of the cracking.

Rick

Links: Documents / Tuning for Mileage | Toyota Sensors | Autoshop Sensor Tutorials
04-26-2009 05:22 PM
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striker273 Offline
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RE: DRY CELL QUESTION
(04-26-2009 05:22 PM)colchiro Wrote:  The threaded holes are often a problem and the source of the cracking.

Exactly if you use a pipe thread tap this will reduce or eliminate cracking around the threaded holes.

1999 Honda Civic Lx.
1.6 liter
21 plate 4"x4" dry cell
single efie
1 lpm @ 19 amps
NaOH electrolyte
04-26-2009 05:44 PM
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BroBob1 Offline
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RE: DRY CELL QUESTION
(04-26-2009 05:08 PM)striker273 Wrote:  
(04-26-2009 02:52 PM)colchiro Wrote:  Cracking has been a big problem with most clear plastics.

I've been using 1/2" lexan for about 8 months without any problem. Make sure you use a pipe thread tap it's different than SAE thread it's tapered. There is too much stress on an SAE thread which causes the cracking.

1/4" Pipe Thread with a 1/4" pipe thread tap is what I used on the first 2 plates that cracked, so I decided to try the 5/8 straight thread fitting, thinking the pipe thread was possibly causing the cracking (The Wedge Effect). But this cracked also! I'm going to try a different bolt pattern, along with 4- 5/8 fittings , 2 on the bottom(Electrolyte in) and 2 on the top (HHO out)
If this doesn't work I'll try I'm going to try the HDPE (white)
04-26-2009 05:52 PM
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