counterlung materials

seeboth · 15th January 2008, 06:42

I know this has to be a common problem with homebuilding, but Im trying to figure out what materials I could use to make a counterlung.

Does any one have a megalodon, with the neoprene cl? If so are the lungs lined? or are the seams just sealed, using something such as aqua seal? I would be afraid of the neoprene cement off gassing...

I found a good site with lots of good fabrics, such as 1000 -1050 D cordura and neoprene, Outdoor Fabric and Marine Fabric, Books and Patterns

they also carry a heat sealable urathane coated 1050 D cordura, its a little bit thicker than the 1000 D cordura used in the dromedary bags, but the process (from genisis' post: http://www.rebreatherworld.com/home-...ung-tip-4.html) to make seams could be used for this material. Only problem is its only available in hot pink and i dont think anyone really wants hot pink counterlungs.
Also the fabric doesnt state if its coated with food-grade polyurethane, does any one think that is an issue? Im not sure how high pressures of o2 could effect that.

thanks for any advice, Ill keep looking for more options,
Al

Edvin M · 15th January 2008, 08:16

If you look in the thread you linked to there is a link to Seattle Fabrics, they have alot of different heatsealable cordura and other fabrics. I am going to order some stuff from them if I cant find anyone is Europe who sells them.

But if you really want a pink Rebreather then check out www.thinkpinkscuba.divebiz.net for the rest of the stuff :P

O.C.Diver · 15th January 2008, 12:54

Trilaminant drysuit material is the ultimate counterlung material. It remains flexible when cold, and is virtually puncture proof. It is assembled with glue and can be seam taped for added strength. You need to keep it filled with water for about a week until the glue stops off gassing. I used one for years on my home built.

Ted

seeboth · 15th January 2008, 15:15

Ted, for the trilaminat, where were you able to find the fabric, did you just use an old drysuit?

Edvin, Seattle Fabrics is actually the site I was referring too, although I didnt realize it was mentioned in the post I linked to, its a great site for most material, but the heat sealable ballistics is only available in pink.

Currently I am leaning towards using neoprene, the off gassing of the sealent should be able to be dealt with as Ted described, so Im not to worried about that, ill just have to order the material to make a trial version first

O.C.Diver · 15th January 2008, 19:03

Quote: (Originally Posted by seeboth)

Ted, for the trilaminat, where were you able to find the fabric, did you just use an old drysuit?

Edvin, Seattle Fabrics is actually the site I was referring too, although I didnt realize it was mentioned in the post I linked to, its a great site for most material, but the heat sealable ballistics is only available in pink.

Currently I am leaning towards using neoprene, the off gassing of the sealent should be able to be dealt with as Ted described, so Im not to worried about that, ill just have to order the material to make a trial version first

I got mine from a drysuit manufacturer who is no longer in business. I would try the drysuit repair facilities as they will likely have sheet material for big repairs.

Ted

PoseidonSv · 23rd January 2008, 18:57

I would like to order som PU coated Nylon or cordura and wonder if someone else in Sweden like to buy this at the same time?

curator · 25th January 2008, 12:06

I had very good success with double layer homebuilt lungs. The outer made from any wear resistant material you can get hold of and the inner air tight bags made from Surface marker buoy material. I just cut the SMB bag to a length slightly longer than the outer bag and let the outer bag maintain the shape of the lungs. The inside of SMB material is smooth (ideal for cleaning) and if you've got access to a bag heat sealer it can be used to seal the cut end of the SMB.

The other advantage of this design is that you can modify it very easily and add webbing/straps to the outer bag.

Cheers

Curator

heigo · 25th January 2008, 13:02

Quote: (Originally Posted by PoseidonSv)

I would like to order som PU coated Nylon or cordura and wonder if someone else in Sweden like to buy this at the same time?

from
finland Shelby - Extreme Materials & Gear

Lycka till igen..

Edvin M · 25th January 2008, 13:21

Quote: (Originally Posted by curator)

I had very good success with double layer homebuilt lungs. The outer made from any wear resistant material you can get hold of and the inner air tight bags made from Surface marker buoy material. I just cut the SMB bag to a length slightly longer than the outer bag and let the outer bag maintain the shape of the lungs. The inside of SMB material is smooth (ideal for cleaning) and if you've got access to a bag heat sealer it can be used to seal the cut end of the SMB.

The other advantage of this design is that you can modify it very easily and add webbing/straps to the outer bag.

Cheers

Curator

SMB bags are often made out of PU coated cordura, it's just quite alot expensier than buying the raw material

15th January 2008, 06:42	#1 (permalink)
seeboth New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jan 2008 Location: Wisconsin, United States Posts: 44	counterlung materials I know this has to be a common problem with homebuilding, but Im trying to figure out what materials I could use to make a counterlung. Does any one have a megalodon, with the neoprene cl? If so are the lungs lined? or are the seams just sealed, using something such as aqua seal? I would be afraid of the neoprene cement off gassing... I found a good site with lots of good fabrics, such as 1000 -1050 D cordura and neoprene, Outdoor Fabric and Marine Fabric, Books and Patterns they also carry a heat sealable urathane coated 1050 D cordura, its a little bit thicker than the 1000 D cordura used in the dromedary bags, but the process (from genisis' post: http://www.rebreatherworld.com/home-...ung-tip-4.html) to make seams could be used for this material. Only problem is its only available in hot pink and i dont think anyone really wants hot pink counterlungs. Also the fabric doesnt state if its coated with food-grade polyurethane, does any one think that is an issue? Im not sure how high pressures of o2 could effect that. thanks for any advice, Ill keep looking for more options, Al
(Offline)

15th January 2008, 08:16	#2 (permalink)
Edvin M New Member Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Aug 2007 Location: Lysekil, Sweden Posts: 97	Re: counterlung materials If you look in the thread you linked to there is a link to Seattle Fabrics, they have alot of different heatsealable cordura and other fabrics. I am going to order some stuff from them if I cant find anyone is Europe who sells them. But if you really want a pink Rebreather then check out www.thinkpinkscuba.divebiz.net for the rest of the stuff :P
(Offline)

15th January 2008, 12:54	#3 (permalink)
O.C.Diver Helium Addict Current Rebreather/s: Classic Kiss Other CCR Home Build Other Rebreather/s: Not Bought Yet Other CCR Home Build Join Date: Mar 2006 Location: Salisbury MD USA Summers; Wandering Florida Winters Posts: 217	Re: counterlung materials Trilaminant drysuit material is the ultimate counterlung material. It remains flexible when cold, and is virtually puncture proof. It is assembled with glue and can be seam taped for added strength. You need to keep it filled with water for about a week until the glue stops off gassing. I used one for years on my home built. Ted __________________ Consider this my opinion.......sometimes I'm even right, but remember.........YMMV. Ted Green Charter Boat "OC Diver" http://www.ocdiver.com
(Offline)

15th January 2008, 15:15	#4 (permalink)
seeboth New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jan 2008 Location: Wisconsin, United States Posts: 44	Re: counterlung materials Ted, for the trilaminat, where were you able to find the fabric, did you just use an old drysuit? Edvin, Seattle Fabrics is actually the site I was referring too, although I didnt realize it was mentioned in the post I linked to, its a great site for most material, but the heat sealable ballistics is only available in pink. Currently I am leaning towards using neoprene, the off gassing of the sealent should be able to be dealt with as Ted described, so Im not to worried about that, ill just have to order the material to make a trial version first
(Offline)

15th January 2008, 19:03	#5 (permalink)
O.C.Diver Helium Addict Current Rebreather/s: Classic Kiss Other CCR Home Build Other Rebreather/s: Not Bought Yet Other CCR Home Build Join Date: Mar 2006 Location: Salisbury MD USA Summers; Wandering Florida Winters Posts: 217	Re: counterlung materials Quote: (Originally Posted by seeboth) Ted, for the trilaminat, where were you able to find the fabric, did you just use an old drysuit? Edvin, Seattle Fabrics is actually the site I was referring too, although I didnt realize it was mentioned in the post I linked to, its a great site for most material, but the heat sealable ballistics is only available in pink. Currently I am leaning towards using neoprene, the off gassing of the sealent should be able to be dealt with as Ted described, so Im not to worried about that, ill just have to order the material to make a trial version first I got mine from a drysuit manufacturer who is no longer in business. I would try the drysuit repair facilities as they will likely have sheet material for big repairs. Ted __________________ Consider this my opinion.......sometimes I'm even right, but remember.........YMMV. Ted Green Charter Boat "OC Diver" http://www.ocdiver.com
(Offline)

23rd January 2008, 18:57	#6 (permalink)
PoseidonSv New Member Current Rebreather/s: Home Build Other Rebreather/s: Not Bought Yet Home Build Join Date: Jan 2006 Location: Sweden Posts: 56	Re: counterlung materials I would like to order som PU coated Nylon or cordura and wonder if someone else in Sweden like to buy this at the same time?
(Offline)

25th January 2008, 12:06	#7 (permalink)
curator New Member Current Rebreather/s: Inspiration Classic Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: Feb 2006 Location: West Midlands, UK Posts: 68	Re: counterlung materials I had very good success with double layer homebuilt lungs. The outer made from any wear resistant material you can get hold of and the inner air tight bags made from Surface marker buoy material. I just cut the SMB bag to a length slightly longer than the outer bag and let the outer bag maintain the shape of the lungs. The inside of SMB material is smooth (ideal for cleaning) and if you've got access to a bag heat sealer it can be used to seal the cut end of the SMB. The other advantage of this design is that you can modify it very easily and add webbing/straps to the outer bag. Cheers Curator
(Offline)

25th January 2008, 13:02	#8 (permalink)
heigo Petri Keskitalo Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Jun 2005 Location: Thailand/Sweden Posts: 97	Re: counterlung materials Quote: (Originally Posted by PoseidonSv) I would like to order som PU coated Nylon or cordura and wonder if someone else in Sweden like to buy this at the same time? from finland Shelby - Extreme Materials & Gear Lycka till igen.. __________________ P3
(Offline)

25th January 2008, 13:21	#9 (permalink)
Edvin M New Member Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Aug 2007 Location: Lysekil, Sweden Posts: 97	Re: counterlung materials Quote: (Originally Posted by curator) I had very good success with double layer homebuilt lungs. The outer made from any wear resistant material you can get hold of and the inner air tight bags made from Surface marker buoy material. I just cut the SMB bag to a length slightly longer than the outer bag and let the outer bag maintain the shape of the lungs. The inside of SMB material is smooth (ideal for cleaning) and if you've got access to a bag heat sealer it can be used to seal the cut end of the SMB. The other advantage of this design is that you can modify it very easily and add webbing/straps to the outer bag. Cheers Curator SMB bags are often made out of PU coated cordura, it's just quite alot expensier than buying the raw material
(Offline)

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