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=== Hand cut stems === | === Hand cut stems === | ||
=== Delrin tenons === | === Delrin tenons === | ||
Delrin is the brand name for an acetal resin engineering plastic invented and sold by DuPont. Often marketed and used as a metal substitute, Delrin is a lightweight, low-friction, and wear-resistant plastic capable of operating in temperatures in excess of 90 degrees celsius (approx 200 degrees Fahrenheit). According to the material safety data sheet from DuPont, the material has a slight odor of formaldehyde. | |||
Other names for this compound include: polyoxymethylene (POM), acetal resin, polytrioxane and polyformaldehyde. | |||
The Food and Drug Administration has approved Delrin for use in the food industry. | |||
Delrin has proven to be an excellent material for use as stem tenons in pipe making. It is self-lubricating, and strong. The disadvantages are that it is so strong that should a pipe with a Delrin tenon be dropped, the shank might break, instead of the tenon. Shank repairs are, of course, much more problematic then stem replacement, or repairs to a broken tenon. Using a Delrin tenon can also limit the shape of the stem near the shank of the pipe where the Delrin is glued into the stem. This is especially the case for close to the shank saddle or 1/2 saddle stems. Still, Delrin is the prefered tenon material of many pipe makers, and an excellent alternative to hand cutting tenons when hand cut stems, or turning down tenons in pre-molded stems. | |||
See [[Using Delrin Tenons]] for a complete outline of how to use Delrin tenons. | |||
=== Stem inserts === | === Stem inserts === | ||