Originally Posted by Doug Stormforce
As with all tubes there are different grades, never had a problem with Tornado or Xs pv tubes in fact I've found them harder wearing than the hypalon tubes I've had.
I thought the point was that XS and Tornados are/where made of PU not PVC, and that the construction process is entirely different, ie. PU is welded and PVC glued, hence why repairing PU is very tricky (see FAQ section of this site).
Valiant I think is the major user of PU in the mainstream market and they quote repeatedly that their seams are stronger then their tubes, and that PU is of theoretically a higher specification that hypalon. In what way - longetivity strength etc - I don't know!