Impact Resistance
Relative susceptibility of plastics to fracture by shock as indicated by the energy expended by a standard pendulum type impact machine in breaking a standard specimen in one blow
Injection
The cone shaped holes that taper down to the cavity area normally in the top plate of a transfer type mold. The stock is forced through these holes when the mold is under pressure. The rubber then fills the cavity area and forms a rubber part
Injection Molding
A molding method in which a rubber or plastic material is heated and forced under pressure into the mold cavity
Injection Pressure
The pressure on the face of the injecting ram when injecting material into the mold
Injection Ram
The ram or screw that applies pressure to the molten plastic material to force it into the mold cavities
Injection Tearout
A molding defect identified by a hole in the rubber part at varying widths and depths located at the point where the rubber is forced into the cavity area
Insert
A term referring to a metal or plastic component, placed ("inserted") into a mold cavity prior to the start of the molding cycle, to which rubber or plastic is chemically and/or physically bonded during the molding process
Internally Lubricated Rubber
A rubber formulation containing lubricating materials. An internally lubricated rubber is designed to reduce the materials coefficient of friction
IRHD (International Rubber hardness Degrees)
A system of characterizing an elastomer by its resistance to penetration of a known geometry indenter by a known force. the microtechnique is reproducible on irregular as well as flat surfaces and on cross sections as small as 1mm in thickness (.04"). Measurements taken using the IRHD scale are similar, but not identical, to those obtained using the Shore A scale
I.D. (Inner Diameter)
The innermost (smallest diameter) surface of a circular object, such as a bore or a round seal. the term I.D. is frequently used to indicate both the circumferential surface itself as well as the measured diameter of that surface
Jetting
A turbulent flow in the resin melt caused by an undersized gate or where a thin section becomes thicker
Jig
A tool for holding parts of an assembly during the manufacturing process
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