Rubber compound for Guitar "Capo"

Manufacturer: Shall I use plasticised PVC or rubber for the lining of guitar capo?
JohnWoon: Guitar capo lining must be soft enough so that it does not damage the guitar strings especially the nylon ones used for classical Spanish guitars. Also, it should not affect the polymer coating which is sometimes used on metal strings. At the same time it must have low compression set for it to exert a consistent pressure on the strings between the frets of the guitar.

I would prefer to use an NR based compound to a PVC mix since the latter has poor set property while the former could be compounded with very low compression set using EV curing system. The rubber strip could be compression moulded or injection moulded. Casting or dippng from a latex compound is also a possibility.



Note: For those who do not know what a capo is, it is a clamp that you stick on different frets of the guitar to change the pitch or key of the open strings. Each fret on the guitar is a half step, therefore, if you put a capo on the 1st fret, all of the open strings will sound a half step higher than normal. This makes changing the key of a song very easy. Some times I come across songs having really weird chords that I don't want to really struggle with. With a capo, I can change the key or pitch of my guitar and make those tough chords very much easier to play.

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