Definitions /Dictionary/Glossary - nptel

Coin Test: Using a coin to tap a laminate in different spots, listening for a change in sound,
which would indicate the presence of a defect.
Cold Press Molding: Compression molding without the heat – A technique for molding
thermoset plastics in which a part is shaped by placing the fiber and resin into an open mold
cavity, closing the mold, and applying heat and pressure until the material has cured or achieved
its final form.
Cold-setting Adhesive: A synthetic resin adhesive capable of hardening at normal room
temperature in the presence of a hardener.
Collet: The drive wheel that pulls glass fibres from the bushing.
Collimated: Rendered parallel.
Collimated Roving: It is the roving that has been made using a special process so that the
strands are more parallel than in standard roving.
Colloidal: A state of suspension in a liquid medium in which extremely small particles are
suspended and dispersed but not dissolved.
Color Stability: It is the ability of a surface coating or pigment to resist degradation due to
environmental exposure.
Commingled Yarn: A hybrid yarn made with two types of material intermingled in a single
yarn; for example, thermoplastic filaments intermingled with carbon filaments to form a single
yarn.
Compaction: The application of a temporary vacuum bag and vacuum to remove trapped air and
compact the lay-up.
Compatible: The ability of different resin systems to be processed in contact with each other
without degradation of end product properties. (See Compatible)
Composite: A homogeneous material created by the synthetic assembly of two or more
materials (selected filler or reinforcing elements and compatible matrix binder) to obtain specific
characteristics and properties. Composites are subdivided into classes on the basis of the form of
the structural constituents; Laminar: Composed of layer or laminar constituents; Particular: The
dispersed phase consists of small particles; Fibrous: The dispersed phase consists of fibers;
Flake: The dispersed phase consists of flat flakes; Skeletal: Composed of a continuous skeletal
matrix filled by a second material.
Composite Class: It is a major subdivision of composite construction in which the class is
defined by the fiber system and the matrix class, e.g., organic-matrix filamentary laminate.