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NDT
Abbreviation for non-destructive testing.
Rapid Prototyping Glossary
N
Definitions for commercial rapid prototyping, production, machining, casting, moulding, finishing and inspection terms.
Near-net shape
A part made very close to final geometry so only limited finishing is required.
Nested build
An additive build arrangement in which multiple parts are packed within the build volume for productivity.
Nesting
The act of arranging parts in a build chamber, on a sheet or on stock to maximise utilisation.
Net shape
A part produced to its final intended geometry with no major subsequent shaping.
Nickel plating
Applying a nickel coating for corrosion protection, wear resistance or cosmetic effect.
Nitrogen assist
Use of nitrogen gas in a process such as laser cutting or moulding to improve quality or reduce oxidation.
Nominal dimension
The target or basic dimension from which tolerance is applied.
Non-destructive testing
Testing that reveals defects without making the part unusable.
Non-return valve
The assembly at the front of the screw that allows melt to flow forwards during dosing but restricts backflow during injection; also called a check valve or check ring assembly.
Normalising
A heat-treatment cycle used mainly on steels to refine microstructure and relieve stress.
Nozzle
The outlet through which molten polymer, metal wire, resin or abrasive fluid is delivered.
Nozzle diameter
The effective opening size of a print nozzle, affecting bead width and minimum feature capability.
Nylon 6
PA6; an engineering nylon used in machining, moulding and some additive formulations.
Nylon 11
PA11; a nylon grade often used where toughness, flexibility and lower moisture uptake are valued.
Nylon 11 EX
A high-performance SLS nylon grade introduced for tougher powder-bed polymer parts than standard PA 12.
Nylon 12
PA12; a common powder-bed polymer with good dimensional stability and balanced mechanical properties.
Nylon 12, GF
A glass-filled Nylon 12 material used where additional stiffness, dimensional stability and thermal resistance are needed.
Nylon 12, Multi-Color (CB)
A full-colour Nylon 12 offering intended for functional parts that also require direct colour, graphics or labelled detail.
Nylon 12, Smooth
A smoother-surfaced Nylon 12 grade designed to improve as-printed appearance and respond well to vapour smoothing.
Nylon 12, White
A bright white Nylon 12 grade intended for clean aesthetics, contrast-sensitive applications and dyeable polymer prints.
Nylon 66
PA66; a stronger, higher-temperature nylon than PA6 in many applications.
Nylon PA 12
Polyamide 12; one of the most common powder materials for SLS and MJF because it balances strength, toughness and chemical resistance.