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Impact Modifiers: Additive used to enhance the material’s ability to withstand the force of impact.

Impact Resistance: The resistance of plastic articles to fracture under stresses applied at high speeds.

Impact Strength: The ability of a material to withstand shock loading.

Injection (also known as Fill Time): Time required to fill the cavity or mold.

Injection Blow Molding: Blow molding process by which the plastic parison to be blown is formed by injection molding.

Injection Molding Pressure: The pressure applied to the cross-sectional area of the molding cylinder.

Injection Molding: The method of forming objects from granular or powdered plastics, most often of the thermoplastic type, in which the materials are fed from a hopper to a heated chamber in which it is softened, after which a ram or screw forces the material into a mold. Pressure is maintained until the mass has hardened sufficiently for removal from the mold.

Injection Pressure: The pressure on the face of the injection screw or ram when injecting material into the mold usually expressed in PSI.

Insert Molding: Insert molding is the process of molding plastic around preformed metal inserts. This process is compatible with both thermoplastic and thermoset materials.

Insert: a removable part of the mold imparting increased resistance to wear, heat transferability, or changeable part shape to that area of the mold.

Insulated Runner (also known as Hot-Runner Mold or Runnerless Molding): A mold in which the runners are insulated from the chilled cavities and are kept hot. Hot-runner molds make parts that have no scrap.

Isobar: a line of equal pressure. Any point along an isobar sees the same cavity pressure as any other point along the same isobar.

Isochrone: a line of equal time. Any point along an isochrone is filled at the same time as any other point along the same isochrone.

Isotherm: a line of equal temperature. Any point along an isotherm is at the same temperature as any other point along the same isotherm.