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Plaster of Paris from Gypsum
Charlie

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Charlie

11. uMfumfu 2026DE
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Plaster of Paris from Gypsum

Gypsum is calcium sulfate with water locked in its crystals (CaSO4·2H2O). Heated to about 120–180 °C it gives up three quarters of that water as steam and becomes the hemihydrate, plaster of Paris. Mixed with water again it takes the water back and sets hard, starting about 10 minutes after mixing, warming as it sets and expanding slightly. The name comes from the big gypsum deposit at Montmartre in Paris.
Oqalayo
Half a day

Imiyalelo

1

Crush the gypsum

With a dust mask on, break the gypsum in a sack with the sledgehammer and grind it fine in the mortar. Sieve it.

Izinto zokwakha zalesi sinyathelo:

I-gypsum (i-calcium sulfate)I-gypsum (i-calcium sulfate)2 kg

Amathuluzi adingekayo:

Isaka le-hessianIsaka le-hessian
Isando esikhuluIsando esikhulu
Isigqulo NomgquloIsigqulo Nomgqulo
Isisefo Senetha EcolekileIsisefo Senetha Ecolekile
Imaski YothuliImaski Yothuli
Izibuko zokuphephaIzibuko zokuphepha
2

Weigh it

Weigh the powder and spread it thinly on baking sheets.

Amathuluzi adingekayo:

Isikali Sedijithali SasekhishiniIsikali Sedijithali Sasekhishini
Ipuleti lokubhakaIpuleti lokubhaka
3

Calcine

Heat it in the oven at about 150 °C, checked with an oven thermometer, stirring now and then. Steam comes off; carry on until a cold glass held over it no longer mists.

Amathuluzi adingekayo:

UhhaviniUhhavini
Ithemomitha YehhaviniIthemomitha Yehhavini
Isethi yezipuni zokhuniIsethi yezipuni zokhuni
Amagilavu Amelana NokushisaAmagilavu Amelana Nokushisa
4

How much weight it should lose

Ilayisha incwadi ye-Jupyter…
5

Weigh again

Weigh the cooled powder. Turning the dihydrate into the hemihydrate loses about 16 % of the weight; much less means it needs longer.

Amathuluzi adingekayo:

Isikali Sedijithali SasekhishiniIsikali Sedijithali Sasekhishini
6

Test a pat

Stir a spoonful into a little water in a bowl to a cream and time how long it takes to set hard. Feel it warm up as it sets.

Izinto zokwakha zalesi sinyathelo:

AmanziAmanzi0.05 ilitha

Amathuluzi adingekayo:

IndishiIndishi
Iwashi Lokumisa IsikhathiIwashi Lokumisa Isikhathi
7

Store airtight

Seal the rest in an airtight container: damp air spoils it slowly.

Amathuluzi adingekayo:

Izitsha zokugcina ezingangeni moyaIzitsha zokugcina ezingangeni moya

Izinto

2

Amathuluzi Adingekayo

15

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