Originally Posted by vpolonsk
read a bunch of threads from this forum about materials.
this US Navy paper looks very legid and it recommends to switch from hypalone to urethane:
what is your research based on?
That study is now over 12 years old and the recommendation of PU was based partly because of greater abrasion resistance, partly because of a quicker adhesive curing time, but mainly because of greater puncture resistance of PU. The U.S navy could have easily specified PU for all of their combat rubber raiding crafts (CCRCs) which are hypalon futura 470 commandos made by Zodiac, but they didn't. Why? - I don't know, but this is what I do know;
a) A new bullet proofing technology known as 'armorflate' can be used in conjuction with hypalon, it is far more puncture proof than PU.
b) While PU adhesives may cure quicker, they also crystalize and break down far quicker.
c) The worlds two foremost retubing outfits, Paul Tilley and Olmtec tubing, overwhelming recommend hypalon for retubing. Paul Tilley has stated that neither PVC or PU have even close to the life expectancy of hypalon (see this thread PU or Hyperlon Tubes which to go for?
). Paul has dealt extensively with all 3 materials and won't even warranty work done on PVC or PU.
d) There are Hypalon watercraft built during WWII that are still in use in BC.