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Plaster of Paris from Gypsum
Charlie

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Charlie

11. Ukwakira 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.
Utangiye
Half a day

Amabwiriza

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.

Ibikoresho by'iyi ntambwe:

Jipise (sulufate ya kalisiyumu)Jipise (sulufate ya kalisiyumu)2 kg

Ibikoresho bikenewe:

Umufuka wo kubikamo wa burlapUmufuka wo kubikamo wa burlap
Inyundo niniInyundo nini
Isekuru n'UmuhiniIsekuru n'Umuhini
Akayunguruzo Gafite Urukoma RutoAkayunguruzo Gafite Urukoma Ruto
Agapfukamunwa k'UmukunguguAgapfukamunwa k'Umukungugu
Amadarubindi y'umutekanoAmadarubindi y'umutekano
2

Weigh it

Weigh the powder and spread it thinly on baking sheets.

Ibikoresho bikenewe:

Iminzani ya Digitale yo mu GikoniIminzani ya Digitale yo mu Gikoni
Isahani yo gukaranga mu itanuraIsahani yo gukaranga mu itanura
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.

Ibikoresho bikenewe:

ItanuraItanura
Igipimo cy'ubushyuhe cy'itanuraIgipimo cy'ubushyuhe cy'itanura
Ibiyiko by'ibitiIbiyiko by'ibiti
Uturindantoki twihanganira ubushyuheUturindantoki twihanganira ubushyuhe
4

How much weight it should lose

Gupakira ikaye ya 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.

Ibikoresho bikenewe:

Iminzani ya Digitale yo mu GikoniIminzani ya Digitale yo mu Gikoni
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.

Ibikoresho by'iyi ntambwe:

AmaziAmazi0.05 litiro

Ibikoresho bikenewe:

IbakuliIbakuli
Isaha yo GuhagarikaIsaha yo Guhagarika
7

Store airtight

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

Ibikoresho bikenewe:

Ibikoresho byo kubikamo bidafungura umwukaIbikoresho byo kubikamo bidafungura umwuka

Ibikoresho

2

Ibikoresho bikenewe

15

Iki gishushanyo gikora

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Agateganyo

Ipuratsi ya Paris

Free

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