GLOSSARY OF TERMS
I

Ignition loss: the difference in weight before and after burning. As with glass, the burning off of the binder or size.

Impact strength: the ability of a material to withstand shock loading.

Impact test: measure of the energy necessary to fracture a standard sample by an impulse load.

Impregnate: in reinforced plastics, to saturate a reinforcement, especially fiberglass, with a resin.

Inhibitor: a substance that retards a chemical reaction. Also used in certain types of monomers and resins to prolong storage life.

Initiator: peroxides used as sources of free radicals. They are used in free-radical polymerization, for curing thermosetting resins, as cross-linking agents for elastomers and polyethylene, and for polymer modification.

Injection molding: method of forming a plastic to the desired shape by forcing the heat-softened thermoplastic polymer into a relatively cool cavity under pressure or thermosetting polymer into a heated mold. All Schmelzer Industries veils can be used in injection molding.

Inorganic pigments: natual or synthetic metallic oxides, sulfides, and other salts that impart heat and light stability, weathering resistance, color, or migration resistance to plastics.

Insert: an integral part of plastic molding consisting of metal or other material that may be molded into the part or pressed into position after the molding is completed.

In-Situ: in place. In the position which it will finally occupy, e.g. molding or forming foam.

Interface: the boundary or surface between two different, physically distinguishable materials. On fibers, the contact area between fibers and sizing or finish. In a laminate, the contact area between the reinforcement and the laminating resin.

Interlaminar: descriptive term pertaining to an object (for example, voids), event (for example, fracture), or potential field (ofr example, shear stress) referenced as existing or occurring between two or more adjacent laminae.

Interlaminar shear: shearing force tending to produce a relative displacement between two laminae in a laminate along the plane of the interface.

Intumescent: fire-retardant technology which causes an otherwise flammable material to foam, forming an insulating barrier when exposed to heat.

Irreversible: not capable of redissolving or remelting. Chemical reactions that proceed in a single direction and are not capable of reversal (as applied to thermosetting resins).

Isocyanate plastics: plastics based on resins made by the reaction or organic isocyanates with other compounds.

Isophthalic: polyester resin based on isophthalic acid, generally higher in properties than a general purpose or orthothatic polyester resin.

Isotropic: having uniform properties in all directions.

Izod impact test: a test for shock loading in which a notched specimen bar is held at one end and broken by striking, and the energy absorbed is measured.

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