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HEMIHYDRATE ALPHA [2 records]

Record 1 2016-04-01

English

Subject field(s)
  • Dentistry
DEF

A product obtained by calcining gypsum under steam pressure.

OBS

It is composed of regularly shaped grains, with low porosity, and requires little water for a satisfactory mix.

French

Domaine(s)
  • Dentisterie
DEF

Produit obtenu par calcination du gypse sous pression de vapeur d'eau.

OBS

Il est constitué de grains réguliers, a une faible porosité et se gâche avec un peu d'eau.

Spanish

Campo(s) temático(s)
  • Odontología
DEF

Producto obtenido mediante calcinación de yeso (gypsum) bajo presión de vapor.

OBS

Se compone de granos regulares, con baja porosidad, y que requiere poca cantidad de agua para obtener una mezcla satisfactoria.

Save record 1

Record 2 2001-05-22

English

Subject field(s)
  • Binders and Mastics (Constr.)
  • Chemical Engineering
CONT

Beside its family of well known dihydrate processes..., over the last twenty five years PRAYON has developed a dihydrate-hemihydrate process that produces merchant grade calcium sulfate together with 36% P205 acid. As the calcium sulfate is obtained as wet alpha-hemihydrate, it contains very little water and, if allowed to cure, will naturally rehydrate by combining with its free moisture to produce a "selfdried" gypsum.

OBS

hemihydrate: A crystalline compound with one molecule of water of crystallization per two molecules of compound...

OBS

An application of a new phase determination procedure to the structure of cyclo(hexaglycyl)demihydrate.

Key term(s)
  • hemihydrate alpha

French

Domaine(s)
  • Liants et mastics (Construction)
  • Génie chimique
DEF

Variété de demi-hydrate obtenue en atmosphère de vapeur saturée ou en milieu humide. Le demi-hydrate Alpha est compact et cristallin. Sa solubilité dans l'eau est inférieure à celle du composé Bêta.

OBS

Si, du point de vue chimique, les sulfates de calcium sont en apparence des produits simples, les cristallographies et textures des sulfates de calcium hydratés présentent une grande variété, notamment le semihydrate bêta, plus communément connu sous le nom de plâtre de PARIS.

Key term(s)
  • demihydrate alpha
  • hémi-hydrate alpha

Spanish

Save record 2

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