I have finally used up my old stock of the green drive band material that so many of us fell in love with years ago...
I never knew this and honestly thought the green belting worked great, but Bruce had mentioned that it is designed to slip. Sure enough, their website states the same:
This rough green (also matte or textured) Polycord® equivalent round polyurethane cord has a textured surface that is designed to slip a little. The rough surface has a low coefficient of friction which is useful in accumulation zones, or where jams happen frequently. Use this material in place of standard clear polyurethane when you need the belt to "give" a little, instead of overheating or abrading.
I had saved the website
https://www.ebelting.com as it was suggested by John Loughner awhile back. My green belting was 88A Durometer, so I thought I'd give some different Durometers a try. I ordered both the clear - 2mm/83A and the red - 2mm/90A. I have tried the clear, which is much softer and has a lot more grip than my old green belt. I plan to use the red on dynamos/heavy loads, based on the description:
Higher durometer heavy duty urethane belting typically used to drive heavy loads on line-shaft and powered roller conveyors.
I suggested this belting to Chris (Cbwho), and he found some 80A in brown on their site (I had completely missed this in my search), and pointed out that it would be a good match to look like leather belting. I am interested to hear his results as well... an o-ring is 70A.
Anyway, I am a very happy customer with the clear, have yet to try the red. Mine arrived within 5 to 6 days (weekend included).
I hold both ends over a lighter till they are on fire, blow them out and push them together. After a few seconds I roll the joint smooth between my fingers. I have never had luck with black o-ring material and super glue, but I made a video showing how well this belting stays together at the weld. Not a good video and yes I smashed my hand on the desk
luckily there wasn't a steam toy in the way! I wanted to test the strength with a fishing scale, but it was too easily maxed out without even being close to the breaking point.
Many choices here in the Cord/Raw Material section
https://www.ebelting.com/index.php?main_page=index&cPath=11