2. PROTECTIVE & DECORATIVE COATINGS:-
Special materials are used in the finishing
coats of plastering or over the plastered
surfaces to meet one or more of specific
requirement such as decorative appearance,
high durability,fire – proofing,heat
insulation,sound insulation,early
completion,high strength,etc..

3. Some of these special materials are given
below:-
 Plaster of paris.
 acoustic plasters.
 granite silicon plaster.
 Asbestos marble plaster.
 keene’s cement.
 Parian cement.
 Snow- crete and colour crete cement.
 barium plaster.
 plaster’s putty.

4. PLASTER OF PARIS:-
 Quick-setting gypsum plaster consisting of a fine,
white powder, calcium sulfate hemihydrate.
 Used since ancient times, plaster of paris is so
called because gypsum was early used near
Paris to make plaster and cement.
 Plaster of paris is also used to hold parts of
ornamental plasterwork placed on ceilings and
cornices.
 Used in medicine to make plaster casts to
immobilize broken bones while they heal.
 Some modern sculptors work directly in plaster
of paris.
 The speed at which the plaster sets gives the
work a sense of immediacy and enables the
sculptor to achieve the original idea quickly.

5. ACOUSTIC PLASTERING:-
Acoustic plaster is plaster which contains fibres or
aggregate so that it absorbs sound.
Such plaster is applied in thicknesses of up to 1.5
inches. As compared with other sound insulation, it
is easy to apply and is fireproof but it can be more
fragile, being affected by physical stress and
humidity.
Acoustic plaster is used in construction of rooms
which require good acoustic qualities such
as auditoria and libraries.

6. BARIUM PLASTER:-
 This is made from barium sulphate and is employed
as a final coat to the walls of X-ray rooms.
 This finish acts as protection for the persons working
in X- rays rooms as this surface absorbs the X-rays.
 Walls can be covered with lead to give any desired
protection and there is no better protection than this
method can afford ,provided the lead has a sufficient
thickness and is properly laid.
 Barium plaster has been advocated as an X-ray
protective wall material.

7. GRANITE SILICON PLASTER:-
 Granite is a ready-to-use render made
from a silicone resin mixed with
coloured quartz or marble aggregate.
 The product is weather resistant, impact
resistant and washable.
 This type of plaster possess the quick –
setting and highly elastic properties
 This material therefore, when used in
plastering is not liable to crack.
 It provides a hydrophobic layer that is
permeable to water vapour.
 The product is available in three finishes:
Marble, Quartz and Natural.

8. ASBESTOS MARBLE PLASTER:-
 This is a mixture of finely crushed
marble,asbestos and cement.
 It is used only for finishing coat,this
material presents a beautiful, marble
like finish.
 A new plaster surface will give you 5 to
8 years of good service, depending on
chemical maintenance and is usually
the least expensive resurfacing option.

9. KEENE’S CEMENT:-
 A hard-finish gypsum plaster to which alum
has been added and which is used chiefly as
a gauging plaster in lime mortar for walls (as
of hospitals, stores, railroad stations)
 It is plaster of paris which is calcined with
alum.
 This material is the hardest form of gypsum
plaster and sets within few days.
 It is white in colour and takes up a high glass
–like polish.
 It is used for highly decorative plastering
work and ornamental work,due to its
polishing characteristics.

10. PARIAN CEMENT:-
 A hard finish plaster, similar to
Keene's cement plaster,
except borax is used as an
additive in place of alum.
 It is also plaster of paris which
is calcined with borax.
 It is also used for interior work.
 This type of cement is
preferred for surfaces with
large areas.

11. SNOW- CRETE AND COLOUR CRETE
CEMENTS:-
 These are the trade names given to
the white and coloured cements
respectively
 White cement is used for both
external and internal works
 Coloured cements are used for
finishing coat of external works
 These coloured cements present a
decorative appearance to the
surface being plastered.

12. PLASTER’S PUTTY:-
This is prepared by slaking of pure lime
with water,bringing it to creamy
consistency,then straining it through a
fine sieve and finally allowing it to
evaporate until sufficiently stiff to use
It is normally used as a last coat to internal
walls which are intended to be coloured
later.
their self-healing nature reduces cracking
problems.
they can reduce condensation problems.

13. SIRA BITE:-
This material is obtained by slacking
plaster of paris with petroleum
It is quick setting and gives a white
hard surface on drying
It posses good workability and high fire
resisting properties
It is used for plastering of internal
work for fire resistant construction

14. SCAGLIOLA:-
 This material is an imitation marble which is obtained by
dissolving keene’s cement and colouring pigments in glue
 This material is used for pilasters , panels , columns, etc.
 Scagliola is a form of plaster, traditionally gypsum, which
imitates decorative stone and has been widely used for the
decoration of walls, columns, floors, fireplaces and table
tops.
 the use of scagliola is more commonly associated with the
imitation of the finest marbles on a much larger scale,
without any joints or defects, and for columns and
pilasters in particular

15. THISTLE HARD WALL:-
This material is a product of high grade gypsum
which has got the capacity of carrying sand
It sets rapidly and produces an excellent finish
It is normally used for internal work
High impact resistance and quicker drying
surface. Suitable for application by hand, or
mechanical plastering machine, to most
masonry backgrounds.