GLOSSARY
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G
GALVANIC CELL
When dissimilar metals or alloys are
in contact with the same body of an electrolytic solution such as sea
water, a galvanic cell can be created by electrically connecting the
dissimilar metals. A current then flows, accelerating the corrosion
of the more active metal and preventing the corrosion of the less active
metal until the more active metal is completely consumed.
GALVANIC CORROSION
A process produced by a cell consisting
of dissimilar metals or alloys in contact with the same body of an electrolytic
solution such as sea water. Upon electrically connecting the dissimilar
metals, a current flows, producing accelerated corrosion of the more
active of the dissimilar metals or alloys.
GALVANIC PROTECTION
The selective use of galvanic corrosion
to protect one metal from deterioration by connecting it to another
more active (electrically negative), sacrificial metal. Both metals
must be in contact with the same body of an electrolytic solution such
as sea water. Zinc, magnesium, or aluminium can be used as sacrificial
metals for the galvanic protection of steel.
GALVANIZING
Application of a zinc coating on steel
by dipping it in molten zinc or by depositing zinc on the steel electrolytically.
GELLING
Any process whereby paint or varnish
thickens to jelly-like consistency.
GENERIC
Belonging to a particular family, without
brand name; non-proprietary.
GILDING
Process of applying metal leaf (metal
hammered into very thin sheets) for decorative effects. Gold, palladium,
brass, and aluminium are metals commonly used in gilding wood, metal,
plaster, glass, and other surfaces.
GLAZING
A process of applying transparent or
translucent coatings over a painted surface to produce blended effects
of their colours.
GLAZING COMPOUND
A dough-like material consisting of pigment
and vehicle, used for sealing window glass in frames. It differs from
putty in that it retains its plasticity for an extended period.
GLOSS
The degree to which a surface reflects
visual images. Gloss is a direct function of coating formulation.
GLOSS METER
A device for measuring the light reflectance
of coatings.
GLOSS RETENTION
Ability to retain original sheen.
GLYCOL ETHER SOLVENT
This organic solvent is a subcategory
of an ester solvent. Glycol ether solvents used in paints include ethylene
glycol monoethyl ether (Cellosolve), ethylene glycol monobutyl ether,
ethylene glycol monoethyl ether acetate (Cellosolve acetate), and propylene
glycol monomethyl ether acetate.
GOLD LEAF
Gold pounded into extremely thin sheets
or ribbons for use in gilding.
GRAIN RAISING
Swelling of the fibres of wood caused
by absorbed liquids, especially water.
GRAININESS
Roughness of a protective film resembling
grains of sand.
GRAINING
Simulating the grain of wood by means
of specially prepared colours or stains and graining tools.
GRASSCLOTH
A wallcovering made by gluing woven native
grasses onto a paper backing; also machine-printed wallcoverings that
simulate grass-cloth.
GRIT
An abrasive obtained from slag, naturally
occurring minerals, steel, and various other materials.
GROUND COAT
The coating material applied before graining
colours, glazing, or other finish coat.
GUIDE COAT
A coat similar to the finish coat but
of different colour. It is applied first and then topped with the finish
coat to assure complete coverage.
GYPSUM
The principal core material in drywall
panels, consisting chemically of hydrous calcium sulphate.
GYPSUM BACKING BOARD
Gypsum panel used as a base layer in multiply construction.
GYPSUM WALLBOARD
A mill-fabricated construction panel,
usually 4 by 8 feet in dimension, made of a none combustible core, essentially
gypsum.
GYPSUM WALLBOARD CONSTRUCTION
Attachment of drywall panels to framing
in one or more layers to form walls and ceilings.
