GLOSSARY
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O
OIL-BASED COATING (PAINT)
A paint or varnish that contains resins
or oil varnish and drying oils as the basic film-forming ingredients
and is converted to a solid film primarily by chemical reaction (usually
oxidation).
OIL LENGTH
The ratio of oil to resin in a medium. For an oleo-resinous varnish, the oil length may be expressed in terms of parts by weight of oil to one part by weight of resin.
OIL STAIN
A solution of dye in a blend of oil or
varnish and solvents. Some oil stains are pigmented in order to reduce
the depth of penetration of the stain.
OIL VARNISH
A varnish that contains resin and drying
oil as the basic film-forming ingredients and is converted to a solid
film primarily by chemical reaction.
OLEORESIN
A natural plant product that contains
oil and resins. Turpentine is an example.
OLEORESINOUS VEHICLE
A vehicle prepared by the addition of
a resin to a drying oil.
OPACITY
The property of a paint that enables
it to hide and colour a surface.
OPEN ABRASIVE BLAST CLEANING
An air abrasive blast cleaning operation
without any localized containment surrounding the blast stream.
OPEN GRAIN WOOD
Wood that has loose, open formation with
minute openings between the fibers. Examples: oak or walnut.
OPEN TIME
The length of time a wallcovering adhesive
is tacky and bondable.
ORANGE PEEL
The dimpled appearance of a dried coating
film resembling the skin of an orange.
ORBITAL SANDER
A power sander with a flat abrasive pad
that is vibrated in small, circular motions.
ORGANIC ZINC-RICH COATING
Anti-corrosive primer for iron and steel
incorporating zinc dust pigment in an organic vehicle. The most common
types of binders for organic zinc-rich coatings are epoxy polyamide,
urethane, vinyl, and chlorinated rubber.
ORIFICE
Opening or hole in a spray or blast nozzle.
OUTRIGGER BEAM
A fixed or movable arm that extends beyond the edge of a roof or structure. It is used for rigging scaffolds.
OVERLAP SEAM
See WALLCOVERING SEAM.
OVERSPRAY
Spray particles that are not wet enough
to fuse when they reach the surface being sprayed.
OXIDATION
Corrosion of metals and degradation of
other substances caused by oxygen in the air.
