B. Terms / Glossary

    • Mold - a negative of the object to be cast

    • Cast - a positive of the object copied

    • Undercut - a shape the mold must support that is not directly accessible from "the top"

  • Draft - sloped shape that makes it easier to remove objects from ridge molds

    • Dimensional accuracy - distortion of the orginal objects size or shape.

  • Draft Angle - a method that gives one part molds a way to release.

    • Two part mold - A mold done in two parts for reasons of undercut, draft, cost savings or other technical consderations

    • One part mold - A mold that has one open faced

  • Mold Release - a chemical that can prevent bonding of materials.

    • Cure Inhibition - Incompatible chemical that slows or stops thermoset / vulcanization process leaving a gum mess

    • Catalyst - increases in the rate of thermoset, material that causes vulcanization of a monomer (resin).

    • Vulcanize - The process of liquid to solid transition of resins.

  • Thermoset - https://en.wikipedia.org/wiki/Thermosetting_polymer

  • Thermoform - https://en.wikipedia.org/wiki/Thermoforming

  • Pot life - time between mixing and pour finishing

  • Shelf life - Thermoset material storage time

  • Library Life - how long / how many castings the mold is good for

    • Durometer - A measure of flexiblity

    • Degass - a pressure vessel used pull bubbles out of solution

    • Mold Key - A method of registration in a multi-part mold.

    • Sprue - A route to cast materials into the mold. www.en.wikipedia.org/wiki/Sprue_(manufacturing)

    • Mold Vent - A route for air to escape a mold when casting.

  • Parting Line - a path around a part in a multi-part mold that hides the mold sepration seam by leaving little or no undercut.