Before trying to locate an independent lab, why not post photos of all the parts in the timing belt path as you remove them: the TB, the tensioner while still in place and after removal, the roller/idlers, the water pump.
As mentioned previously, timing belts don't normally break -- something else in the path, something that's supposed to turn, stops turning. I don't know if I've ever heard of this causing a TB to break, exactly, though it has caused a TB to melt. But something put more stress on the belt than it was designed to handle -- unless the construction was flawed, then it would have to get past a number of inspections. Including the final inspection, before you installed it.
You don't have to name the supplier, but what is wrong with identifying the brand name of the TB? That way we can warn others against using that brand.