Kevlar in blank production

Century rods have a line of rods where Kevlar has been used in the construction of the butt section, because that particuliar rod gets used literally in the surf on rocks, and they claim it offers good protection against knocks. So this is understandable. Its used for protection.

Kevlar is expensive, so what real benefits does it offer to us? Weight and strength wise , both high modulus graphite and kevlar are similiar in characteristics.

Is the cost justifiable?

If I am right you are referring to the Century Nor'easter blanks that are USA market specific:
S2 Glass tips with nano-resin and Kevlar re-enforced butt sections.
Kevlar is tough with high tensile strength but I would think it does not offer the stiffness that carbon fibre does?

No, Kevlar, cannot match carbon fiber in stiffness.

Yes, the Nor'easter is the rod Im refferring to.

The question is leading to, what purpose does it serve in the butt? It would make more sense to me if the entire rod were fabricated with kevlar? What you think?

Ive also read that Kevlar does not do well with side impacts.

Heres a link to some useful info.....I find it quite interesting going into materials of our rods and how they work. Gives me a better understanding of different things

http://www.christinedemerchant.com/carbon-kevlar-glass-comparison.html

Kevlar gives much better resistance to deformation of the tube under stress - "hoop stress" is how it is sometimes described. Carbon fibre is poor in this respect so to get tough and strong rods using carbon only you need to give great attention to the weave, direction and lay-up of the carbon fibre around the mandrel - makes for additional cost too. You can also do thicker walls in the blanks - something Century has done for a while now. The kevlar composite combination allows greater strength and lighter overall. Used to use a few layers of fibreglass scrim to help with the hoop stress, but those get heavier than a 100% thicker carbon blank.

The engineering gets complex quickly - so there are no really simple explanations.

Thanks !

So, the entire, especially mid section and tip, would need to have it incorporated? Not just butt section? In a 1 piece rod Its understandable.

Anyways, just interested if the cost is worth it for our type of fishing and how neccessary it is.

Thanks for the insight.