Originally Posted by williamhj
I'm a fan of Veevus thread. Use the 12/0 or 14/0 a lot for trout flies. Not pitching all my other thread since it works well also, but I'm happy with the Veevus. For break strength, you may have seen this chart
on the Veevus site, but it is helpful. There are others floating around.
This is not
against you because I think you believed that their thread was thinner and stronger than their competitors.
I happen to be one who is very, very skeptical of the Veevus chart. Their chart compares threads by aught size which is not a valid comparison and it also compares threads of various materials.
First of all the "aught" system has no standard so that one manufacturer's 12/0 is someone else's 8/0. Naturally, the reader thinks that the 12/0 is thinner than the 8/0 but that is not always true.
If you look at charts that actually convert the manufacturer's "aught" sizing to denier, you will see that the that equal deniers of identical material break at about the same tension.
This makes sense to me. How can one manufacturer's nylon or polyester thread be much stronger than another's of the same material? It can't. The thread manufacturer's are not chemical companies that actually make the synthetic material. So they buy the synthetic and it is the synthetic that determines the breaking strength.
Bonding and twisting can change the breaking strength but then you again have an apples to oranges situation since bonded threads are different that non bonded treads.
See the chart that Christopher Helm has compiled.
Whitetail Fly Tieing | Thread
I have compiled the polyester threads into the chart below so you can compare Veevus to others by denier which is the actual mass of thread in each of the manufacturer's "aught' sizes.
Veevus 16/0 is 50 denier and breaks at 12 oz. Eurothreads 12/0 is 45 denier which is less than Veevus but it is a bit stronger at 15 oz breaking strength.
Veevus 14/0 and 12/0 are the IDENTICAL 70 denier and surprise, they both break at 14 oz. Uni 8/0 is 72 denier and breaks at 15 oz.
The bottom line is choose the thread you like and IGNORE the aught ratings. They are totally useless as you can see. It is the material that determines the breaking strength and not some mystical and artificial high "aught" that a manufacture tries to use to fool you into thinking their thread is thinner and therefore stronger than another manufacturer.
If seeing is believing consider the hook below which has been wrapped with 40 turns of the thread. Compare the Uni 8/0, to the UTC 70, to the Benecchi 12/0, to the Gordon Griffiths 14/0, to the Veevus 14/0 and 12/0. These threads are all about 70 denier polyester and they have the identical bulk and they ALL BREAK within an oz. of 14 oz. tension.