UHM
Ultra-high-modulus
UHMW
Ultra-high molecular weight
UL
Underwriters' Laboratories
Ultimate Elongation
The % of specimen stretching at the point of breaking. Generally referred to in tensile testing
Ultimate Elongation
Expressed as a percentage of its original length, a measure of how far a material will stretch before breaking
Undercut
A feature on a part which has a corresponding feature in the part's mold which is perpendicular to the direction of mold movement. An undercut complicates the manufacture of a molded part by making it difficult to remove the finished part from the mold
UV
Ultraviolet
VAE
Vinyl Acetate-ethylene
Valve Gating
This type of gate is where a pin is held in the gate or channel by spring tension and as the plunger comes forward, it compresses the plastic in the runner. When this pressure build-up is sufficient to overcome the spring tension, the pin is then pushed back (pulled) and the fast decompression of the plastic fills the cavity at extremely high speed
Vent
A shallow channel or opening cut in the cavity to allow air or gases to escape as the material fills the cavity
Viscosity
The measurement of the resistance of a material to flow under stress
Volume Change
The measure of the swell or shrinkage of a material resulting from immersion in a particular media for a specified period of time at a specified temperature
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