A material's ability to withstand shock loading as measured during a test in which a specimen is fractured.
Impregnate
To saturate the voids and interstices of a reinforcement with resin.
Impregnated fabric
See prepreg.
Inclusion
Physical and mechanical discontinuity occurring within a material or part.
In situ
In the original position; in filament winding, designates a mandrel that remains in place after winding, as opposed to a mandrel that is removed after winding. In pipe repair, a type of repair that does not require pipe excavation; rather a composite sleeve is inserted into the existing pipe through a manhole.
Inhibitor
A chemical additive that slows or delays a cure cycle.
Injection molding
A method of forming a plastic to the desired shape by forcibly injecting the polymer into a mold.
Integral heating
System in which heating elements are built into a tool, forming part of the tool and usually eliminating the need for an oven or autoclave as a heat source.
Interface
The plane formed when two material surfaces make contact: in glass fibers, for instance, the area at which the glass and sizing meet; in a laminate, the area at which the reinforcement and laminating resin meet.
Interlaminar
Existing or occurring between two or more adjacent laminae in a laminate.
Interlaminar shear
Shearing force that produces displacement between two laminae along the plane of their interface.
Intralaminar
Existing or occurring within a single lamina in a laminate.
Intumescent
Capable of swelling or enlarging. In reference to fire-retardants, describes a layer or coating of material designed to swells or thicken in order to form a more effective barrier to heat and/or flame when exposed to either.
Isotropic
Fiber directionality with uniform properties in all directions, independent of the direction of applied load.
Isotropic laminate
A laminate in which the strength properties are equal in all directions, such as contact-molded laminates or metals.
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