Sample kits available. They can withstand pressures of over 2000 psi. This does not include hard collar' or clamp type devices. Most kits consist of some sort of fiberglass cloth and a resin system.
Performance varies greatly with the resin system probably being the most important factor.
Water activated resin system repair kits are certainly some of the easiest and most convenient to use. Unfortunately these resins are not very strong and therefore require an excessive number of reinforcing wraps. The pipe repair kits and epoxies sold by Progressive Epoxy Polymers take another tack. A standard three-wrap repair has been pressure tested to over 3,000 PSI in the lab. An added advantage of this epoxy system is that it can be applied to wet or sweating pipes, even applied underwater.