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Water Block Design / Construction Building your own block? Need info on designing one? Heres where to do it

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Unread 03-30-2003, 11:46 AM   #1
sneakerski
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Default Creating Seal between copper and Polypropylene

What is the best way to make this seal? I don't have any clue about even the basics of sealing, so any help would be appreciated. Polypropylene is just a non-porous cheapo plastic used in tanks and ducts, and i'm using it as the cap ontop of my copper block. I was thinking either some kind of rubber type material around the edge of it or a adhesive/caulk type material??? Can you point me towards any material names or brands that will help me out? Thanks!
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Unread 03-30-2003, 12:05 PM   #2
#Rotor
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Marine Goop.... "Sticks like shiate"
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Unread 03-30-2003, 12:11 PM   #3
sneakerski
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Quote:
Originally posted by #Rotor
Marine Goop.... "Sticks like shiate"
cool, thanks. i assume 3.7 ounces is more than enough, right?
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Unread 03-30-2003, 12:28 PM   #4
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O ring and bolts also does fine.
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Unread 03-31-2003, 08:00 AM   #5
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boo
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Unread 03-31-2003, 08:01 AM   #6
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O ring groove in copper and bolts will seal up to 1000psi if you follow the following guideline:

H=2/3*D
W= 1.18*D to 1.2*D

Where D is the cross sectional diameter of the O ring
H is the depth of the groove
W is the width of the groove

The groove can be cut with a standard endmill, no need for a special cutter.

It actually works:
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Unread 03-31-2003, 08:01 PM   #7
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where did you get that 1000psi number? why dont you try putting 1000psi thru your block, I gaurentee its gonna splode.

as for sealing, marinegoop or rtv silicone and screws works insanely good, another thing that works great is JBweld


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Unread 03-31-2003, 10:12 PM   #8
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I just made and used a liquid cell that had to hold water at STP inside a chamber that was UHV (10^-7 torr or so). Just a groove, an o ring, and 4 hex bolts holding it down. Never leaked in 5 days of experiments...
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Unread 04-02-2003, 02:19 PM   #9
Fixittt
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o-ring and the groove, it works great............

I know this........


HEHEHHEHEHE
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Unread 04-02-2003, 03:47 PM   #10
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Quote:
Originally posted by JFettig
where did you get that 1000psi number? why dont you try putting 1000psi thru your block, I gaurentee its gonna splode.

as for sealing, marinegoop or rtv silicone and screws works insanely good, another thing that works great is JBweld


Jon
The block would explode because the top is made out of acrylic. If the top were made out of copper It would probably hold. I got that number from cathar.
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Unread 04-02-2003, 03:54 PM   #11
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O rings are used to seal much higher gas pressures than 1000. However you shouldnt need to be even close to that number.

Ive used standard rubber, urethane, and teflon o-rings to seal above 1400 psi nitrogen pressures.

so 1000 is a low "baseline"...
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Unread 04-02-2003, 06:13 PM   #12
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Ok, now with that being said, anyone remember the PSI number that the MAZE 2 held before it exploded? And it was a soldered top block.



Come on............ I know some of you guys have to remember.......
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Unread 04-03-2003, 03:37 AM   #13
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If you can't old chap, what hope is there for us?! ...
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Unread 04-03-2003, 09:16 AM   #14
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Oh I remember, it was a big deal on there site, They made a point to advertise that the block could take 1000 psi. I beleive that the bursting point was between 1200 and 1400 psi.....
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Unread 04-03-2003, 07:42 PM   #15
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go to dangerden.com click on the 'tested at 1000+psi' text in the logos and whatnots, It should still be there, They have a video, I think it held at 1400psi for a little bit...
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Unread 04-04-2003, 03:08 AM   #16
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Do they use soldering or brasing for sealing the maze2 ?
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Unread 04-04-2003, 03:27 AM   #17
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Quote:
Originally posted by Fixittt
Oh I remember, it was a big deal on there site, They made a point to advertise that the block could take 1000 psi. I beleive that the bursting point was between 1200 and 1400 psi.....
Yep, somewhere around 1300-1350. I watched that video several times. Though it was a Maze1, the olĀ“ original.
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Unread 04-04-2003, 11:38 AM   #18
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I think you all see where I was going with it though...............


that is why I used O-rings from the very beginning.
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Unread 04-05-2003, 03:03 AM   #19
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Hmmm, I've never said 1000PSI for O-rings, I've always said 300+PSI, which is information that I attribute to BillA. I do recall saying about the Loctite 567 thread sealant for barbs which is rated for well over 1000PSI, which is perhaps what's being referred to here.
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