| Suspension |
A relatively coarse, non-colloidal dispersion
of solid particles in a liquid. |
| Synthetic |
Manufactured, as opposed to naturally
occurring. |
| Tabor Abraser |
An instrument used to measure abrasion
resistance. |
| Tails |
Finger-like spray pattern produced by improper
gun or coating material adjustment. |
| Tape Time |
The drying time of a coating required prior to
masking sections for lettering or striping after which tape will not distort the finish. |
| Thermocouple |
A temperature measuring device. |
| Thermoplastic |
Resins having the property of becoming soft
upon the application of heat but which regain hardness after cooling. |
| Thermosetting |
Resins having the property of becoming
insoluble or hard upon the application of heat. |
| Thinners |
A liquid (solvent) added to a coating to
adjust viscosity. |
| Thixotropic |
An adjective which describes full bodied
material which undergoes a reduction in viscosity when shaken, stirred or otherwise
mechanically disturbed but which readily recovers its original full bodied condition upon
standing. |
| Toluene |
An aromatic solvent with a high boiling range
and low flash point classified as a strong solvent. |
| Tooth |
The profile, mechanical anchor pattern or
surface roughness. |
| Two-Pack |
A coating which is supplied in two parts and
must be mixed in the correct portions before use in order to cure. |
| Undercoat |
The coat applied to the surface after
preparation and before the application of a finish coat. |
| Underfilm Corrosion |
Corrosion that occurs under films in the form
of randomly distributed hair lines. |
| Vapor Barrier |
A moisture-impervious layer which prevents the
passage of water into a material or structure. |
| Vapor Transmission Rate |
The rate at which moisture passes through a
material or coating. |
| Vehicle |
The liquid portion of a paint in which the
pigment is dispersed. Comprised of binder and thinner. |
| Vinyl Copolymer |
A resin produced by copolymerizing vinyl
acetate and vinyl chloride. |
| Viscometer |
One of several types of instrument for
measuring a liquids viscosity. |
| Viscosity |
A measure of fluidity of a liquid. |
| Viscosity Cup |
An efflux viscometer utilizing a measured
volume of liquid flowing through a precise orifice. |
| Voids |
Holidays or holes in a coating. |
| Volatile Content |
The percentage of materials which evaporate
from a coating. |
| Volatile Organic Compounds
(VOC) |
A measure of the total amount of organic
compounds evaporating from a coating film, excluding water. |
| Volume Solids |
The volume of the nonvolatile portion of a
composition divided by the total volume expressed as a percent used to calculate coverage
rate. |
| Wash Primer |
A thin paint, usually a chromate, designed to
promote adhesion or to be used as a barrier coat. |
| Water Blasting |
Blast cleaning of metal using high velocity
water. |
| Water Spotting |
A surface defect caused by water droplets
depositing a circular ring of contaminants. |
| Weatherometer |
A machine designed for the accelerated testing
of coatings. |
| Weld Slag |
Amorphous deposit formed during welding. |
| Weld Splatter |
Beads of metal left adjoining the weld. |
| Wet on Wet Application |
As high solids coatings continue to grow in
popularity, the statement of "wet on wet" application is used regularly. Over
the past few years this statement has been used very loosely and its true meaning has been
lost or misunderstood by many. As a clarification "wet on wet" is meant to be
that the coating is applied in TWO separate coats or applications. Whenever possible
contrasting colors should be utilized for the two coats to aid in the
application.Typically the structure is coated with the first coat and the applicator then
turns around and begins the second application. As an example, if you have an I-beam or a
railcar, the complete structure has the first coat applied before the second coat begins.
Depending upon what is being coated the time between coats will vary dramatically. The key
to the whole concept is that it is two independent coats. By applying the coating in two
distinctive coats or applications, it minimized the problems with pinholes, light millage
areas, and solvent entrapment. The misconception has been that you can apply the total
thickness requirement in one coat with multiple passes. Some of the problems associated
with one coat are not alleviated by the thicker film. |
| Wet Sandblasting |
The incorporation of water into the
sandblasting operation in order to minimize dust. |
| Wetting |
The ability of a vehicle to flow onto the
surface in order to achieve a good bond. |
| White Rust |
The oxide of zinc formed on galvanized metal. |
| Xylene |
A flammable aromatic hydrocarbon solvent used
in epoxies and fast drying alkyds. |
| Zinc Dust |
Finely divided zinc metal used as a pigment in
protective coatings. |
| Zinc Phospho Oxide |
A rust inhibitive pigment. |
| Zinc Rich Primer |
An anti-corrosion primer for iron and steel
incorporating zinc dust in a concentration sufficient to provide cathodic protection. |
