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Old 24 February 2004, 12:46   #1
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PU or Hyperlon Tubes which to go for?

The new X-Ribs have PU collars, are there any disadvantages with these compared to the more usual Hyperlon ones ?
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Old 24 February 2004, 13:50   #2
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Forget PU

I suppose you mean Hypalon tubes? Disadvantages of PU compared to Hypalon:

- PU can't stand wear as much as Hypalon
- PU is more sensitive to sunlight
- PU is more easily punctured
- In a along run PU tubes have to be replaced by Hypalon ones with high price...

Couple RIB builders (at least one T-named) are trying to convince that Hypalon is not the best material for tubes, but the truth is that there are no better choises for serious RIB use today. 1500 g/m3 Hypalon is used by military and the most demanding RIB users man can imagine. And they drive hard, really hard, so even heavy civil users can rely on Hypalon as their tube material very well. For absolute pleasure in sheltered waters PU might be a choise, but if you are going to drive at sea, don't think anything else than Hypalon.
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Old 24 February 2004, 15:12   #3
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They both have their advantages and disadvantages; I don't think there is a definite answer.

In lab tests Polyurethane provides about four times the abrasion resistance compared to Hypalon (trademark name for Chlorosulfonated Polyethylene). Also the welded seams used in the construction of PU tubes are thought to be much stronger than glued PE tubes. Hypalon is dissolved by some aromatic and chlorinated hydrocarbons, such as benzene which exists in petrol.

On the other hand Hypalon has been tried and tested for years not only on RIBs but as a roofing material amongst other things.

Don't get mixed up with PVC and PU, PVC rots in the sun, PU doesn't, at least not anywhere near the same rate.

PU is used by the US Military, probably for its abrasion, tear and puncture resistance.
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Old 24 February 2004, 16:33   #4
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US Military

US Military has a lot of Hypalon RIBs in use. For example NSW Rigid Inflatable Boat http://www.specialoperations.com/Navy/RIB/default.html has Hypalon tubes in every 140 boats delivered to US Navy. If PU is better, why Navy chose Hypalon for the most important boat they use? Didn't the engineer next door told to his colleague that PU is better? I don't think so. I would like to see more information, which RIBs are PU tubed in US Military since every major projects I have seen are fitted with Hypalon tubing.

I know Tornado delivers information that US Navy uses PU and it's obviously true in certain scale, but they still have more Hypalon RIBs in service in toughest missions.
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Old 24 February 2004, 17:13   #5
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I believe it was around 1993 that the US navy decided that PU was to be adopted over Hypalon for navy RIBs. I have no idea whether they went ahead with the recomendations of the Naval Surface Warfare Center.
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Old 25 February 2004, 16:55   #6
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Navy RIBs

Can you tell me, which RIBs in US Navy use PU tubes? I just liked to know as I have heard this PU-tube thing many times, but no one has never told me specific boat types. NSW Rigid Inflatable Boat was taken into service 1997-1998, so there really has been time to think carefully all experiences related tu tubes. Maybe US Navy went back to Hypalon after they tested PU in early 1990s? I'll ask when I see Navy buddies next time, but please tell more, if you have details.
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Old 25 February 2004, 17:40   #7
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I've seen somewhere (either here or in a US forum) a comparative test between PVC (as PU) (something German) and Hypapalon (I think it was ORCA but I'm not sure) material.
The results were similar and all in all there was no difference at all in either material being resistance to heat, cold, oil, fuel etc.
PVC had a bad reputation in the past.
However modern PVC materials are as good as anything else. I believe that is a fashion in Europe that most of the tubes are made by hypalon and not PVC. Zodiak and Bombard use PVC and they are doing great!! My boat's tubes are made out of PVC and so far have no problems with it.
May I suggest that when people make statements like this material or the other is no good it would be much better for all if they can substantiate what they say with facts. Otherwise there is no use on the info.
I will try and dig out this test. I think I have saved the file somewhere and post it.
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Old 25 February 2004, 17:49   #8
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I have been following your thread, I am looking for a Rib myself and happened to come across this in the on line ribmagazine. Was written by Paul Lemmer on this very subject...

http://www.ribmagazine.com/articles/...stbuylater.htm

Seems like a fairly good article. Worth a read. Has a bit half way down about Hypalon versus PU/PVC etc
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Old 25 February 2004, 18:22   #9
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Manos, don't get confused between PVC (Poly Vinyl Chloride) and PU (Polyurethane - PUR). PVC is actually more closely related to Polyethylene, and therefore Hypalon than PU.

I would however agree that for the average user the materials used in the construction of the tubes really not need be considered. There are many more important features to consider.

Pitkis – I will try and dig up the info on the US Navy.

Edit: Zodiac seem to use a fabric called Strongan™ Duotex ™. I have no idea what this is made of.
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Old 26 February 2004, 02:49   #10
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Quote:
Originally posted by DJL
Edit: Zodiac seem to use a fabric called Strongan™ Duotex ™. I have no idea what this is made of.
Isn't another (marketable) name for PVC?
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