Is there any consensus on the best prepeg material to make graphite rod blanks? Torayca? Hankuk? Some other prepeg?

Probably that IM2000 stuff Andy Dear was fond of talking about.

Phil,
I concede and relinquish my previous title of the “Habitual-Over-Thinker” of the website to you. In all due respect, and with possibly a bit of jealousy thrown in, my persnickety thinking process pales in comparison to yours. I can only offer to be cautious!!!
Although coming from the composite industry, I admittedly have not kept-up with material or specific manufacturer advancements in the CF world. That being said, I would still be the most comfortable using CF offerings from past industry leaders such as Hexel (American) and Toray (Japanese). I am unfamiliar with “Torayca” or “Hankuk”. From previous experience with and testing their offerings, my confidence in Chinese structural textiles or other third-world offerings is minimal at best. Maybe they have improved, but it would be a hard sale for me.
I am sorry I cannot offer a better answer to your question. Valid as it may be, consider it may be over-thinking for our application.

Mark Talmo
FISHING IS NOT AN ESCAPE FROM LIFE BUT RATHER A DEEPER IMMERSION INTO IT!!! BUILDING YOUR OWN SIMPLY ENHANCES THE EXPERIENCE.

Rod builders tend to obsess over details, myself included. Parsing hundredths of an ounce in guide train weight has been pretty well covered - and re-covered [but it involved measurable, objective data]. I hope contributors can shed some light on the measurable physical qualities of rod blanks themselves - something more substantial than "light" or "powerful" or "medium" or "soulful".