Technical Library

ACTION IV: Plectra material

Delrin vs Celcon…
We offer our harpsichord plectra—all manufactured exclusively for us—to owners, makers and technicians worldwide. Color is not an identifying feature, as most plastics can be manufactured any color.

Delin® is a homopolymer acetal resin patented by DuPont in 1956, and marketed from 1960 with many initial applications including car gearboxes. The natural slipperiness and property retention of Delrin makes it an ideal material for harpsichord plectra, which must obviously bend and return to shape tens of thousands of times over their working life.

• Normal Delrin large wedge, natural
• Medium Delrin large wedge, natural

Celcon® is a copolymer acetal resin marketed by Celanese in 1961, although it wasn’t until the late 1980s that it was first tried for harpsichord use. It has proven very popular with the US makers, but perhaps not so in more tradition-bound Europe. Most Celcon is colored black.

• Normal Celcon large wedge, black

Our large wedge profile (nominal dimensions 0.105˝ base tapered to 0.045˝ over 0.612˝ length) is particularly useful for revoicing certain instruments where previously available smaller wedges would slip through the tongue mortise. The larger size also makes the quills much easier to pick up and handle.

We recommend the normal thickness (.020˝) plectra for unison choirs, and the medium (.0165˝) or thin (.015˝) to save voicing time for the 4⁠´ choir, or instruments with very short plectra length. The normal thickness is sold in packets of approximately 130, sufficient to quill two choirs. The thin and medium plectra are sold in packs of approximately 65, sufficient for one choir. Bulk packs of 1000 are available for professionals. Please refer to our Spare Parts pages for pricing.

No matter what quill material is used, the blanks must be properly voiced in the instrument. Good quality quills nicely voiced should last for a decade or more in an instrument used daily.