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.
    Comments