SINING
BEAUTY AT WELLNESS
CRAFTS
KULTURA AT KASAYSAYAN
LIBANGAN
KAPALIGIRAN
PAGKAIN AT INUMIN
REVERSE ENGINEERING
AGHAM
ISPORTS
TEKNOLOHIYA
MGA WEARABLE

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.
Baguhan
Half a day
Mga Tagubilin
1
1
Crush the gypsum
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.
Mga materyales para sa hakbang na ito:
Yeso (calcium sulfate)2 kgMga kailangang kasangkapan:
Sakong burlap
Mabigat na maso
Almires at Panghalo
Bistay na Pinong Lambat
Maskara Laban sa Alikabok
Salaming pangkaligtasan2
2
Weigh it
Weigh it
Weigh the powder and spread it thinly on baking sheets.
Mga kailangang kasangkapan:
Digital na Timbangang Pangkusina
Bandehang pang-ihaw3
3
Calcine
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.
Mga kailangang kasangkapan:
Hurno
Termometro ng Hurno
Set ng kutsarang kahoy
Guwantes na Matibay sa Init4
4
How much weight it should lose
How much weight it should lose
Naglo-load ng Jupyter notebook…
5
5
Weigh again
Weigh again
Weigh the cooled powder. Turning the dihydrate into the hemihydrate loses about 16 % of the weight; much less means it needs longer.
Mga kailangang kasangkapan:
Digital na Timbangang Pangkusina6
6
Test a pat
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.
Mga materyales para sa hakbang na ito:
Tubig0.05 litroMga kailangang kasangkapan:
Mangkok
Panukat ng Oras7
7
Store airtight
Store airtight
Seal the rest in an airtight container: damp air spoils it slowly.
Mga kailangang kasangkapan:
Mga lalagyang selyado sa hanginMga Kinakailangang Kasangkapan
15- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
- Placeholder
Ang blueprint na ito ay gumagawa ng
CC0 Pampublikong Domain
Ang blueprint na ito ay inilabas sa ilalim ng CC0. Malaya kang kumopya, magbago, mamahagi, at gumamit nang walang pahintulot.
Suportahan ang Maker sa pamamagitan ng pagbili ng mga produkto sa kanilang Blueprint Komisyon ng Maker itinakda ng mga Vendor, o lumikha ng bagong bersyon ng Blueprint na ito at isama bilang koneksyon sa iyong Blueprint upang ibahagi ang kita.
