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Plaster of Paris from Gypsum
Charlie

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Charlie

11. Oktoba 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.
Mwanzo
Half a day

Maagizo

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.

Vifaa kwa hatua hii:

Jipsamu (salfati ya kalsiamu)Jipsamu (salfati ya kalsiamu)2 kg

Zana zinazohitajika:

Gunia la kuhifadhia la hessianGunia la kuhifadhia la hessian
Nyundo kubwaNyundo kubwa
Kinu na mchiKinu na mchi
Ungo wa Matundu MembambaUngo wa Matundu Membamba
Barakoa ya vumbiBarakoa ya vumbi
Miwani ya usalamaMiwani ya usalama
2

Weigh it

Weigh the powder and spread it thinly on baking sheets.

Zana zinazohitajika:

Mizani ya dijitali ya jikoniMizani ya dijitali ya jikoni
Sinia la kuokeaSinia la kuokea
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.

Zana zinazohitajika:

OveniOveni
Kipimajoto cha OveniKipimajoto cha Oveni
Seti ya vijiko vya mbaoSeti ya vijiko vya mbao
Glavu Zinazostahimili JotoGlavu Zinazostahimili Joto
4

How much weight it should lose

Inapakia daftari la 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.

Zana zinazohitajika:

Mizani ya dijitali ya jikoniMizani ya dijitali ya jikoni
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.

Vifaa kwa hatua hii:

MajiMaji0.05 lita

Zana zinazohitajika:

BakuliBakuli
Saa ya kupima mudaSaa ya kupima muda
7

Store airtight

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

Zana zinazohitajika:

Vyombo vya kuhifadhi visivyopitisha hewaVyombo vya kuhifadhi visivyopitisha hewa

Vifaa

2

Zana Zinazohitajika

15

Mchoro huu unatengeneza

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Kishikilia nafasi

Plasta ya Paris

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