List two type of plaster and state one function of each
Answers
Answer:Plaster is a building material used for the protective or decorative coating of walls and ceilings and for moulding and casting decorative elements.
The most common types of plaster mainly contain either gypsum, lime, or cement but all work in a similar way. The plaster is manufactured as a dry powder and is mixed with water to form a stiff but workable paste immediately before it is applied to the surface. The reaction with water liberates heat through crystallization and the hydrated plaster then hardens.
Forms of plaster have several other uses.
In medicine plaster orthopedic casts are still often used for supporting set broken bones.
In dentistry plaster is used to make dental impressions.
Various types of models and moulds are made with plaster.
In art, lime plaster is the traditional matrix for fresco painting; the pigments are applied to a thin wet top layer of plaster and fuse with it so that the painting is actually in coloured plaster.
In the ancient world, as well as the sort of ornamental designs in plaster relief that are still used, plaster was also widely used to create large figurative reliefs for walls, though few of these have survived.
Contents
1 Types
Clay plaster
Gypsum plaster
Lime plaster
Cement plaster
Heat resistant plaster
2 Uses
As a wall covering
Exterior
Interior
In decorative architecture
Art
Funeral processes
Medicine
Fire protection
3D printing
Gallery