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Ebonite / hard rubber adhesion and fountain pens

Ebonite / hard rubber adhesion and fountain pens

(OP)
Hi,

I'd like to find out more about why ebonite functions well as a "feed" for fountain pens. As you may know, fountain pens feeds are designed to convey the ink from the reservoir to the nib, and work through a combination of capillary action and gravity.



It's my understanding that capillary action works through adhesion between the liquid and the surrounding surfaces. Why should there be an appreciable adhesive force between a water based ink and a hard rubber feed? For that matter, why would a plastic ink feed work (as plastic is also used)?

If anyone can shed some light on the physical chemistry going on here, and/or suggest references, I'd appreciate it.

Thanks,

Alex

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