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.