Plaster for a LifetimeGEMPLAST
Gypsum is a binding material obtained by
heating and thus driving off some or all of the
crystallization water in the structure of gypsum
rock.
Pure gypsum rock
CaSO4.2H2O
Impurities : MgO, Al2O3, Fe2O3, SiO2, CaCO3,
MgCO3..
Properties of Gypsum
GEMPLAST Gypsum Plastering : The new trend in construction
Advantages of Gypsum
GEMPLAST Gypsum Plastering : The new trend in construction
Indefinite Life
Gypsum plasters can
retain their chemical
compositions for very
long time. Pyramids like
Cheops and Giza testifies
the property.
Acoustic Properties
Acoustic tiles and
plasters use gypsums
as a binder in its
manufacturing, owing
to its affinity to absorb
air-born sounds
Insulation Properties
Thermal properties and
low conductivity of
gypsum make them
best choice for energy
and power saving
applications.
Bonding Properties
Gypsum by nature
exhibits excellent
bonding properties,
and require only single
coat, on variety
surfaces like R.C.C
ceiling, brick walls,
concrete blocks and
columns.
No Curing Required
Gypsum plasters should
be left to dry as soon as
possible and does not
require any water curing
unlike conventional
plastering methods.
Thus, more suitable in
tropical countries like
India, where whether
conditions are a concern.
Fire Inhibitor
Non-combustible in nature
and contains high amount of
crystal water, essentially
helpful to act as a barrier in
case of fire and help protect
the concrete, steel and block
work.
Nontoxic And Anti-Fungus
Gypsum plaster does not
create any health hazards.
Gypsum plasters does not
allow fungal growth or insects
on its surface. Hospitals and
health clinics prefer gypsum
plasters in their specifications
for these reasons. It helps
provide a clean and healthy
environment
Ease Of Application
Pre mixed and available in
easily handling bags.
Addition of water preps the
mixture for application on
surfaces. a single coating
suffices the requirement
which reduces labor coats,
material coasts and helps
saves time.
Flexural Tensil
Have excellent flexural
and tensil strength, which
resists cracking, thermal
debonding, shearing and
tensile movements
Aesthetics
Provides excellent
background for interior
walls as well as
ceilings, provided
gypsum plastering
gives smooth finishing.
Rust Inhibitor
Gypsum plasters
inhibit corrosion
thereby protect metal
fittings, pips etc. it
prolongs the life of the
metals and makes it
durable in the long run
Absence If Shrinkage Cracking
Unlike cements cracking of
gypsum Is rare when drying
or when hardening.
AD Mixtures of Gypsum
Set Retarders
Borax, tartaric acid, some organic materials, glue, sawdust and blood are used as retarders(max. 0.2%).
Set Accelerators
Alum, sodium sulfate, zinc sulfate
and potassium sulfate are used as
accelerators.
Materials Imparting GreaterCohesion and Higher Tensile Strength
Inclusion of a small amount of organic fiber (hair and wood fibers) or asbestos fiber results in better cohesion and higher tensile strength.
Materials Imparting Greater Plasticity
Sand and hydrated lime (15%) are the common materials used to increase plasticity.
Calcination
Gypsum rock when heated to 100-190°C
looses 3⁄4 of its H2O CaSO4.2H2O →
CaSO4.1/2H2O + 3/2 H2O
Plaster of Paris
This low burning process is
INCOMPLETE CALCINATION.
If the temperature inside the kiln is about
160°C Plaster of Paris
When calcination is carried out at
temperatures above 190°C all water is
removed.
CaSO4.2H2O → CaSO4 + 2H2O
Gypsum anhydrite
This high-burning process is
COMPLETE CALCINATION.
If the temperature inside the kiln is
about 200-205°C anhydrite
PRODUCT DETAILS
- Solid Content - 68 WT %
- Active Substance - 59.25 WT %
- Brightness (∆L) - 90+
- Coverage - 120-140 Sqft/Coat
- Adhesion to Gypsum Surface - 1.5 N/mm2(asper ASTM_D_4541_02 DIN_500014)
- Wet Film Thickness - 100_110 microns/coat
- Minimum film forming temperature - 8°C
- Diffusion Resistance against water vapour - 50m (as per DIN5_615)
- Recommended for - Interior and Exterior
- Shelf life more than 24 months with proper care