Glossary

V

Vacuum Blasting
A shot blasting apparatus that has a vacuum attachment that removes the dust and debris during the blasting operation. This is the preferred surface preparation method. See “Shot Blast”

Vapor Barrier
See Vapor Retarder

Vapor Retarder
A material that impedes the transmission of water vapor under specified conditions.

Vapor Transmission Rate
The rate at which moisture passes through a material or coating. See "Moisture Vapor Test"

Vehicle
The liquid portion of a paint in which the pigment is dispersed.

Vinyl Copolymer
A resin produced by copolymerizing vinyl acetate and vinyl chloride.

Viscometer
One of several types of instruments 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, holes or skips 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.