Uni is mostly Polyester thread, while Danville ans Waspi have mostly Nylon thread. 6/0 Polyester is 140 denier, while 6/0 Nylon is 70 denier.

Polyester does not stretch when tension is applied to the thread, Nylon wil stretch. Nobody every really explaind about this 3/0, 6/0, 8/0 stuff. It was just presumed that the higher the aught the smaller the size of the thread, and along with the size dimenising so does the breaking strength of the thread.

All threads are not created equal, there are various methods of construction of thread that depends on the material being used. Then there is the sealing of the thread (most thread is sealed with a wax or oil lubricant to stop chaffing of the surface, and to allow the thread to move smoothly through the materia) for sewing or weaving purposes.

"If you do not understand how something came to be what it is, there is most likely way back long time ago a horse's *** being somehow connected to the current problem." ~Parnelli