01 March 2005
Seal - An adhesive agent, such as sealant, used to
Unacceptable Response - A detrimental abnormality
close or secure parts to prevent leaks. Seals may also
in system performance.
Undesirable Response - A tolerated interruption of
Sealant - A continuous thick film, with low cohesive
strength, which prevents the passage of liquids or
Uniform Surface Corrosion - Corrosive etching of
metal involving only the surface.
Shelf Life - The length of time an unopened container
can be stored at the recommended storage temperature
and still retain the properties required by the specification.
Viscosity - The degree to which a fluid resists flow
under an applied force.
Solvent - A liquid substance capable of dissolving or
Void Seal - A seal used to fill holes, channels, and other
dispersing another substance.
voids in a fuel tank. The void seal provides continuous
sealing, while a fillet seal would be interrupted by
Tack-Free Time - The length of time required for a
Volatile Organic Compound (VOC) - Compounds in
curing sealant to lose its surface tackiness.
paints and solvents that dissolve into the air. VOC
content is restricted in many materials due to
Thixotropic - A property of certain gels to liquefy when
shaken or stirred and then return to a hardened state
Titration - A method or process of determining the
Water Spotting - The change in surface appearance
concentration of a dissolved substance by adding to it
resulting from the action of water standing on the paint
a standard reagent of known concentration in carefully
film or substrate. Spotting usually is caused by water
measured amounts until a reaction (color change or
sensitivity of the coating, although the defect can be the
electrical measurement) is completed.
result of dissolved material deposited as water
Top Coat -The final paint film applied to a surface.
Wet Edge - The ability of a wet coating to blend
Total Environment - The circumstances and conditions
smoothly together in the overlap areas during application.
which surround and influence the equipment. The total
environment includes manufacturing, storage, shipping,
Wet Installed Fastener - Fasteners that have sealant
mission, maintenance, and repair.
applied to the shank and under the head prior to
installation to provide a corrosion barrier and secondary
Ultraviolet (UV) Light - Light of a wavelength band
Wrap Around - The phenomenon by which electrically
shorter than visible light but longer than X-ray radiation.
charged paint droplets curve around the rear side of the
object being painted.
Shorter wavelength UV from unfiltered UV lamps can
damage unprotected eyes.