Plaster Flashcards
A composition of gypsum or lime, water, sand and sometimes hair or other fiber, applied in a pasty form to the surfaces of walls or ceiling in a plastic state and allowed to harden and dry.
Plaster

A basecoat plaster made of calcined gypsum mixed with sand, water, and various additives to control its setting and working qualities.
Gypsum Plaster

Gypsum heated to drive off most of its chemically combined water.
Calcine gypsum

Calcined gypsum in white, powdery form, containing no additives to control the set, used as a base for gypsum plaster, as an additive in lime plaster, and as a material for making ornamental casts.
Plaster of Paris
A soft mineral, hydrated calcium sulfate, used as a retarder in portland cement and in the making of gypsum plaster.
Gypsum
A finely granular form of pure gypsum, often white and translucent, used for ornamental objects and work.
Alabaster

A mixture of lime, sand and sometimes a fiber, used as a basecoat plaster.
Lime plaster

The addition of portland cement to lime plaster to improve its strength and durability.
Cement Temper
Plaster work applied in three successive coats, a scratch coat followed by a brown coat and a finish coat.
Three-coat plaster
Plasterwork applied in two coats, a basecoat followed by a finish coat.
Two-coat plaster
The final coat of plaster, serving either as a finished surface or as a base for decoration.
Finish Coat
A thin levelling or finish coat of plaster.
Skim Coat
A roughly finished, levelling coat of plaster, either the second coat in three-coat plaster or the base coat in two-coat plaster applied over gypsum lath or masonry.
Brown Coat, Floating coat
Any plaster coat applied before the finish coat.
Basecoat
The first coat in three-coat plaster, which is scratched to provide better bond for the second brown coat.
Scratch coat
A basecoat of neat gypsum plaster.
Hardwall
A gypsum basecoat plaster having no admixture except hair or other fiber, used for on-the-job mixing with aggregates.
Neat Plaster
A mill-mixed gypsum basecoat plaster containing coarse cellulose fibers for greater bulk, strength, and fire resistance, used neat or mixed with sand to obtain a basecoat of superior hardness.
Wood-fibered plaster
A gypsum basecoat plaster containing a small amount of lime and chemical additives to improve the bond of succeeding coats to dense, nonporous surfaces.
Bond plaster
A gypsum basecoat plaster containing perlite as an aggregate to reduce its weight and increase its thermal and fire resistance.
Gypsum-perlite plaster
A gypsum basecoat plaster containing vermiculite as an aggregate to reduce its weight and increase its thermal and fire resistance.
Gypsum-vermiculite plaster
Plaster that is formulated and dry-mixed by the manufacturer, requiring only the addition ofwater at the job site.
Ready-mixed plaster
A finish coat in plastering, consisting of lime putty to which gauging plaster is added to control the setting time and counteract shrinkage.
Gauged Plaster
A specially ground gypsum plaster for mixing with lime putty, formulated to provide either a quick-set or a slow-set for finish coat of plaster.
Gauging Plaster




























