Exactly. Dunno if the Strapworks seat belt material is 1st rate, as the stuff that meets DOT standards must be. The listed price is rather low, and I don't recall seat belts that were just 1" wide, too narrow not to cause its own injury in a crash or roll-over. But, maybe it is stapping that meets tough standards for restraint of child carriers, which would be cool.
An expert in this stuff is going to know how the OP's strap failed; and that person could know, the same as experts on metal failure know from looking a broken part where the break started and how it happened.
I'm pushing seat-belt strapping. because there are properties of fault-tolerance beyond breaking strength. For example, it is woven, so it won't rip or tear easily (at all?) And it is not heavy. Lengths? Sew on it well and right, and trust the stitching as you do the loops sewn in 3/4 - 1" polyester straps.
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