ChanMin said:
any idea whats the difference between delrin , delrex , polycarbonate , celluloid ...etc? any difference in tone or sound?... as they are all plastics...
I'm no expert in plastics, but here's the boring stuff that I know. Delrin a commercial name for acetyl polymer. Since Delrin is a trademarked name, Delrex could be another name for acetyl polymer. Celluloid orginated from cellulose nitrate, that's when the first pick was borned in the 1920s. Before that, they were using real tortoise shell. Nowadays, celluloids are often referred to as mosaic-coloured picks, because it originated that way. In my opinion, celluloid and delrin share similar characteristics when it comes to guitar picking.
Nylon, delrin, polycarb, celluloid are chiefly the plastics suitable for guitar picks because they are very durable; make a pick with other types of plastics and the edges might wear off faster..... another 60 cts down the drain, or frequent filing of the edges.
Given the same gauge, nylon is more flexible, delrin and celluloid are stiffer, and polycarb is the stiffest. The easiest way to tell them apart is by dropping them on a hard surface. The nylon produces a dull thud, delrin and celluloid have a 'cling' sound, and polycarb sounds like unbreakable glass.
Tone and sound? A lot of dynamics are involved. Since nylons are the more flexible ones, theoretically, they are good for strumming. Jim Dunlop's Riffs and Snarling Dogs' Brain picks are all nylons. But, a heavier gauge nylon like JD Riff - eg: the green one (0.96mm)- is also good enough for crossover to leads. For leads, users tend to select delrin, celluloids or polycarb because they are comparatively stiffer. So if I want a 0.60mm thick pick for leads to produce a brighter and stronger tone with fast attack and response, I would choose delrin, cellu or polycarb instead of, say, a JD riff orange colour (0.60mm also). But then again, I can get the same effect with a JD Jazz 3, which is made of nylon, because it is 1.35mm thick.
Funny, talking about picks is like talking about wine.