Definitions /Dictionary/Glossary - nptel

applied force and includes all areas under pressure during complete closing of the mold. The unit
pressure is calculated by dividing the total force applied by this projected area, and is expressed
in pounds per square inch.
Mold Release: A wax or polymer compound that is applied to the mold surface which acts as a
barrier between the mold and the part, thus preventing the part from the bonding to the mold.
Molecules: Chemical units composed of one or more atoms.
Monofilament: A single filament of indefinite length. Monofilaments are generally produced by
extrusion.
Monolayer: The basic laminate unit from which cross-plied or other laminates are constructed.
Monomer: A compound consisting of molecules each of which can provide one or more
constitutional units.
Multifilament Yarn: A large number (500 to 2000) of fine, continuous filaments (often 5 to 100
individual filaments), usually with some twist in the yam to facilitate handling.
Multifilament: A yarn consisting of many continuous filaments.
Multiple-Cavity Mold: A mold with two or more mold impressions; that is, a mold which
produces more than one molding per molding cycle.
Mylar: A trade name for a polyester film used as a release sheet in adhesive and composite
bonding.
Nanometer: Abbreviated (nm) and equal to one millimicron or one billionth meter (10-9),
used to measure wavelengths of light.
NDE: Nondestructive evaluation. It is broadly considered synonymous with NDI.
NDI: Nondestructive inspection. It is a process or procedure for determining the quality or
characteristics of a material, part, or assembly without permanently altering the subject or its
properties.
NDT: Nondestructive testing. It is a broadly considered synonymous with NDI.
Near-Net Shape: A characteristic of a part whose fabricated dimensions are so close to final
dimensions that machining or cutting to final shape is not required.
Neat Resin: Resin to which nothing (additives, reinforcements, etc.) has been added.
Necking: A localized reduction in cross-sectional area which may occur in a material under
tensile stress.