neoprene

**dz3866** · 6th March 2008, 00:23

Anyone know what thickness the meg neoprene lungs are, what mil? want to experiment with making some lungs. thanx Dave.

Meng_Tze · 6th March 2008, 13:04

Quote: (Originally Posted by dz3866)

Anyone know what thickness the meg neoprene lungs are, what mil? want to experiment with making some lungs. thanx Dave.

I would say 3mil. Apparently it is difficult to keep the edges (that band between the top and bottom parts) glued. This is where the majority of leaks start. Good luck with your endeavor, let us know how they turn out.

teomannaskali · 6th March 2008, 14:45

I have set of home made neoprene counterlugns that I am willimg to part with
if you are interested.

http://www.rebreatherworld.com/inspi...tml#post119725

should be approximatelyl the same size as the megs.

Meg was 5mm if I can remember correctly.

Teoman

Captain · 6th March 2008, 16:29

Quote: (Originally Posted by dz3866)

Anyone know what thickness the meg neoprene lungs are, what mil?

I'm waiting for mine soon. I mesure and tell you

Captain · 25th March 2008, 17:42

Finaly it's not easy to measure neoprene
I think 4mm thickness

I test my new Cl this week-end. It's really good product. Good breathing
And especially as if we had nothing on the chest
Equipment easily in water and on the boat

Several pictures of my configuration Megalodon

cedricverdier · 28th March 2008, 17:54

4mm. Difficult to make them though. You don't want them to leak from the sides or from the fittings (T-pieces, manual by-pass, etc). And you need a solid way to clip them to your rig.

teomannaskali · 28th March 2008, 18:45

Probably something other than neoprene glued to reinforce the conenctors. The first CL's that I made, you had to squeeze T pieces on very tight and then that would crush the neprene... And it also stretches a bit...

I did not have a problem with the inflator. But mine were 7mm neoprene. The 4 mm one also didnt have a problem with the inflator...

pwl4476 · 3rd April 2008, 14:40

I've never made any counterlungs but a critical aspect is obviously the material, as you've discussed. That being said, perhaps you can investigate the use of crushed (or compressed) neoprene as used in many neoprene drysuits. It's available in 2 and 4mm, that I'm aware of. It's tougher than typical neoprene, varies less in bouyancy at depth, seems to hold a seam/gluing better (in my experience), and still offers flexibility and stretch characteristics.

pwl4476

cool_hardware52 · 3rd April 2008, 14:59

Quote: (Originally Posted by pwl4476)

I've never made any counterlungs but a critical aspect is obviously the material, as you've discussed. That being said, perhaps you can investigate the use of crushed (or compressed) neoprene as used in many neoprene drysuits. It's available in 2 and 4mm, that I'm aware of. It's tougher than typical neoprene, varies less in bouyancy at depth, seems to hold a seam/gluing better (in my experience), and still offers flexibility and stretch characteristics.

pwl4476

Crushed and compressed neoprene are two distinctly different materials.

Look here Drysuits made from compressed vs. crushed neoprene

Genuine "crushed neo" is actually just slightly negative, and does not undergo any measurable change in buoyancy with respect to depth.

I'd be very surprised if there is any commercial source for true crushed Neoprene. Making such is not trivial, I know, I've done it.

Tobin

teomannaskali · 3rd April 2008, 22:07

The glue is usually very strong. Stronger than the neoprene. If you try to rip it apart from the seam then you actually end up ripping the neoprene and not the glued joint.

Teoman

6th March 2008, 00:23	#1 (permalink)
dz3866 zboy Current Rebreather/s: Sport Kiss Other Rebreather/s: Not Bought Yet Join Date: May 2005 Location: US California Posts: 146	neoprene Anyone know what thickness the meg neoprene lungs are, what mil? want to experiment with making some lungs. thanx Dave.
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6th March 2008, 13:04	#2 (permalink)
Meng_Tze 246 Bubbleless Cove Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Jan 2007 Location: FL, USA Posts: 105	Re: neoprene Quote: (Originally Posted by dz3866) Anyone know what thickness the meg neoprene lungs are, what mil? want to experiment with making some lungs. thanx Dave. I would say 3mil. Apparently it is difficult to keep the edges (that band between the top and bottom parts) glued. This is where the majority of leaks start. Good luck with your endeavor, let us know how they turn out.
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6th March 2008, 14:45	#3 (permalink)
teomannaskali Custom Title Allowed! Current Rebreather/s: Home Build Other Rebreather/s: Not Bought Yet Home Build Join Date: Feb 2006 Location: Istanbul TR Posts: 337	Re: neoprene I have set of home made neoprene counterlugns that I am willimg to part with if you are interested. http://www.rebreatherworld.com/inspi...tml#post119725 should be approximatelyl the same size as the megs. Meg was 5mm if I can remember correctly. Teoman Last edited by teomannaskali : 6th March 2008 at 14:48.
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6th March 2008, 16:29	#4 (permalink)
Captain New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Dec 2005 Location: France Posts: 52	Re: neoprene Quote: (Originally Posted by dz3866) Anyone know what thickness the meg neoprene lungs are, what mil? I'm waiting for mine soon. I mesure and tell you __________________ Jérôme EHIT NPSFQQA #001
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25th March 2008, 17:42	#5 (permalink)
Captain New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Dec 2005 Location: France Posts: 52	Re: neoprene Finaly it's not easy to measure neoprene I think 4mm thickness I test my new Cl this week-end. It's really good product. Good breathing And especially as if we had nothing on the chest Equipment easily in water and on the boat Several pictures of my configuration Megalodon __________________ Jérôme EHIT NPSFQQA #001
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28th March 2008, 17:54	#6 (permalink)
cedricverdier S21 M.I.B. Current Rebreather/s: Evolution Megalodon Other Rebreather/s: Not Bought Yet Inspiration Classic Inspiration Vision Sport Kiss Classic Kiss Join Date: Apr 2005 Location: Worldwide! Posts: 488	Re: neoprene 4mm. Difficult to make them though. You don't want them to leak from the sides or from the fittings (T-pieces, manual by-pass, etc). And you need a solid way to clip them to your rig. __________________ Cedric Verdier PADI Course Director, ANDI-IANTD-PSAI-TDI-DSAT-DAN-NAUI-CMAS Instructor Trainer Trimix (CCR and OC) and Cave Diving Instructor Trainer www.CedricVerdier.com DIRrebreather member
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28th March 2008, 18:45	#7 (permalink)
teomannaskali Custom Title Allowed! Current Rebreather/s: Home Build Other Rebreather/s: Not Bought Yet Home Build Join Date: Feb 2006 Location: Istanbul TR Posts: 337	Re: neoprene Probably something other than neoprene glued to reinforce the conenctors. The first CL's that I made, you had to squeeze T pieces on very tight and then that would crush the neprene... And it also stretches a bit... I did not have a problem with the inflator. But mine were 7mm neoprene. The 4 mm one also didnt have a problem with the inflator...
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3rd April 2008, 14:40	#8 (permalink)
pwl4476 New Member Current Rebreather/s: Megalodon Other Rebreather/s: Join Date: Oct 2007 Location: Olathe, KS Posts: 50	Re: neoprene I've never made any counterlungs but a critical aspect is obviously the material, as you've discussed. That being said, perhaps you can investigate the use of crushed (or compressed) neoprene as used in many neoprene drysuits. It's available in 2 and 4mm, that I'm aware of. It's tougher than typical neoprene, varies less in bouyancy at depth, seems to hold a seam/gluing better (in my experience), and still offers flexibility and stretch characteristics. pwl4476
(Online)

3rd April 2008, 14:59	#9 (permalink)
cool_hardware52 RebreatherWorld Sponsor Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Mar 2005 Location: SoCal USA Posts: 358	Re: neoprene Quote: (Originally Posted by pwl4476) I've never made any counterlungs but a critical aspect is obviously the material, as you've discussed. That being said, perhaps you can investigate the use of crushed (or compressed) neoprene as used in many neoprene drysuits. It's available in 2 and 4mm, that I'm aware of. It's tougher than typical neoprene, varies less in bouyancy at depth, seems to hold a seam/gluing better (in my experience), and still offers flexibility and stretch characteristics. pwl4476 Crushed and compressed neoprene are two distinctly different materials. Look here Drysuits made from compressed vs. crushed neoprene Genuine "crushed neo" is actually just slightly negative, and does not undergo any measurable change in buoyancy with respect to depth. I'd be very surprised if there is any commercial source for true crushed Neoprene. Making such is not trivial, I know, I've done it. Tobin __________________ www.deepseasupply.com
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3rd April 2008, 22:07	#10 (permalink)
teomannaskali Custom Title Allowed! Current Rebreather/s: Home Build Other Rebreather/s: Not Bought Yet Home Build Join Date: Feb 2006 Location: Istanbul TR Posts: 337	Re: neoprene The glue is usually very strong. Stronger than the neoprene. If you try to rip it apart from the seam then you actually end up ripping the neoprene and not the glued joint. Teoman
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