I've tried partial hanging with different kinds of ropes. I tried different hemp ropes of up to 15mm and they only choked me. As in, making me suffocate instead of blocking the blood stream to my brain. That is so horrible and painful I could never get through with that.
I now have a nylon rope that's about 8mm, with a load of 100kg. On testing, it immediately stopped blood flow to the brain instead of strangling my windpipe. This is what I'll be using.
Not sure if it helps, but that's my experience on this matter.