E

Edge Gate: entrance to the part from the runner located on the parting line.

Ejection Pin Marks: A residual mark on the part caused by the profile of the ejection pin.

Ejection Pin: A rod, pin or sleeve that pushes a molded part off of a core or out of a cavity of a mold.

Ejector Return Pins: Projections that push the ejector assembly back as the mold closes. Also called surface pins or return pins.

Ejector Rod: A bar that actuates the ejector assembly when the mold opens.

Elastic Memory: A characteristic of certain plastics evidenced by their tendency to revert to a previously existing shape or dimension.

Elasticity: The ability of a material to quickly recover its original dimensions after removal of a load that has caused deformation.

Elastomer: A rubber-like material which at room temperature can be stretched repeatedly to at least twice its original length and, upon immediate release of the stress, will return with force to its approximate original length.

Element: a triangle defined by at least three nodes, creating the basis for the finite element analysis.

Elongation, Break: The increase in distance between two gauge marks at the breakpoint divided by the original distance between the marks. A zero value in the field indicates that it measured less than one.

Elongation, Yield: The increase in distance between two gauge marks at a yield point divided by the original distance between the marks. A zero value indicates that it measured less than one.

Engineering Plastics: A broad term covering plastics, with or without fillers or reinforcements, which have improved mechanical, chemical and thermal properties of commodity grades of resins.

Extender: A filler material added to a plastic compound used to reduce the amount of resin required per unit value.

Extrudate: The product or material delivered from an extruder, for example, film, pipe profiles.

Extrusion: The process of forming continuous shapes by forcing a molten plastic material through a die.

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