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  #121 (permalink)  
Old July 22, 2008, 03:59 PM
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Im not complaining, I get 2nd floor parking instead of 7th haha
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  #122 (permalink)  
Old July 23, 2008, 01:11 PM
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What are your tank dimensions and how much silicone do you estimate you will need?
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  #123 (permalink)  
Old July 23, 2008, 03:40 PM
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The tank dimensions are 400mm x 154mm x 285mm.

There is a weee caveat though.If you look at what I bought for glass ( 4 pieces ) you might notice there is 1 piece short.There is no 'back' piece of glass.....

I have not exactly decided how to best accomplish the back.I can't use glass because of all the holes that would need to be in it.( If I end up buying a gallon of silicone , it'll be a 1/2 inch thick layer of the silicone....might as well ).

The other thing that could affect how much I need , Is what kind of silicone it is.I made the first tank with 1 tube (300ml) of normal silicone , but thats a thick paste type silicone.The silicones I'm looking at , are thin liquids , and this will affect how I build the tank and therefore how much.

My best guess would be 500-1000 ml.....this is more than i'd actually need I'm sure , but it's better to order too much kinda thing.

-----

I've been in touch with Dow Corning again.....They suggest not all silicones are compatible with Isopropanol......I thought they were , so I'll have to examine this a bit more.....

Apparently I need to be looking at 'fluorosilicones'.....

-------

/me gets back to research.

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  #124 (permalink)  
Old July 23, 2008, 04:56 PM
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Well...

I found a really great resource at Momentive performance materials.

Note : I've re-hosted this because I'm not sure if momentive is cool with hotlinks.

http://braineater.kicks-ass.tv/miscshite/2008RTV.pdf

This is the current 'aerospace' silicone pdf. If you need silicone for damn near anything , it's here.

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  #125 (permalink)  
Old July 23, 2008, 05:43 PM
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Whoa. Do you know how long I have been searching for such a file? Thank you. Saved. Still searching.
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  #126 (permalink)  
Old July 23, 2008, 05:47 PM
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haha !!
You and me both mang.

Since I started looking into this , it took me 6 weeks to find that.

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  #127 (permalink)  
Old July 23, 2008, 06:03 PM
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Found it.

Hehe. Looky here. 5000 psi tensile strenght, -196C, 24 hours cure time at 24C. Interested? PR1665, from PRC Desoto.

http://buyat.ppg.com/REP_aerospace_f...1665_11_03.pdf
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Last edited by 3.0charlie; July 23, 2008 at 06:43 PM.
  #128 (permalink)  
Old July 24, 2008, 07:32 AM
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!!

Thanks John ! ...... a lot !!

I just got off the phone with ppg/desoto canada.

10 ounces is 200 bux.

Only 1 hurdle....I am waiting for them to call me back regarding materials compatibility data.It's gotta be resistant to Iso.

fingers crossed.

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  #129 (permalink)  
Old July 24, 2008, 07:37 AM
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I know - I woke up this morning thinking about the compatibility aspect. I would be very surprised if it wasn't.

Actually the idea came from my wife (she works at Bombardier too); I explained to her what you're doing, and that I'm trying to find a sealant that would do the job - and she simply said "what about the fuel tank sealant?"

That was it. Simple as that.
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  #130 (permalink)  
Old July 24, 2008, 08:04 AM
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Some form of PRC would probably do the trick as well, but yeah, looking through the list of products, my guess would be one of the fuel cell certified ones.
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