Houses and Buildings - PLASTERER
Activities with Plaster of Paris
Primary
Australian
Curriculum General Capability:
Critical and creative thinking
Teacher
Parent
Want some creative mess? You know the deal - plenty of newspaper or plastic. Lots of plaster of paris, time and things to create - leaves, sticks, spoons etc.
1. Read the following website or more for older students and create a project!
2. Have a class display.
Creating
a new Ceiling Panel
Secondary
Australian
Curriculum General Capability:
Critical and creative thinking
1. You are going to design a new ceiling panel.
Have a look at the following
websites to give you
some ideas. :
Ceiling Panels
2. Look at YouTube videos:
Sovalli Hand Made Plaster Ceiling Roses: https://youtu.be/vEKQbsNCU1s
How to make a ceiling rose in plastering: https://youtu.be/P44iF_EXqy0
3. Design a ceiling rose for a Victoria era house.
What will your design look like? Is it similar to any of the ones displayed? Why?
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Did You Know? Many homeowners and builders use the terms "Plaster of Paris" and "gypsum plaster" interchangeably — but they are not the same material. While both originate from the same mineral, they differ significantly in their chemical form, production process, and application. Chemical Composition The key difference lies in how much water is chemically bound in each material: Gypsum (CaSO₄·2H₂O) — Calcium sulphate dihydrate. Contains 2 moles of crystallised water. This is the naturally occurring mineral found in sedimentary rock layers. Plaster of Paris (CaSO₄·½H₂O) — Calcium sulphate hemihydrate. Contains only half a mole of crystallised water. It is produced by heating raw gypsum. How Each Is Produced Gypsum is a naturally occurring soft sulphate mineral, deposited from lake and sea water over millions of years. It is mined directly from sedimentary rock beds. Plaster of Paris is produced by heating gypsum to around 120°C for about an hour. Three-quarters of the crystallised water in gypsum evaporates during this process, converting it from a dihydrate to a hemihydrate — a white powder we call Plaster of Paris. The name comes from the fact that gypsum was historically found in abundance near Montmartre hill in Paris, and Louis XIV mandated its use to fireproof the wooden buildings of Paris in 1667. (Source: Kanish Plasters) |
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