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問題一覧
1
container (autoclave), at 120oC-130oC; the higher the temperature → the greater the pressure → finer yellow powder particles are produced called dental stone of a-hemihydrate
closed calcination
2
Gypsum is
Calcium sulfate dihydrate (CaSO4*2H2O)
3
type 4
4
Open calcination
Type 2 plaster of paris
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type 4
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type 2
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Exothermic reaction
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type 4 gypsum
dental stone class 2
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type 3 gypsum products
dental stone class 1
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effective retarder of plaster of paris
borax
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Gypsum obtained from
Dihydrate
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type 3
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calcination
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dental stone class 2
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CaSO4 hemihydrate - constituent principal
type 3
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die stone
dental stone class 2
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gypsum is heated in a kettle at 110oC-120oC; production of steam with pressure which changes the rock to powder form, after cooling, the white powder is then called plaster or b-hemidydrate.
open calcination
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type 5
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type ii gpysum product
plaster of paris
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Chemical formula of hemihydrate
CaSO4* 1/2 H2O
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Alabaster B hemihydrate
Type 2 plaster of paris
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plaster if paris process of calcination
open calcination
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heating the gypsum in order to remove the water of crystallization
calcination
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type 4
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dental stone class 1 process of calcination
closed calcination
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Type 2: plaster of Paris
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type 5 gypsum product
dental stone higher strength and expansion
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type 5
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dental stone higher strength and expansion
30
dental stone class 1