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Send EmailCalcium Sulfate Hemihydrate, dicalcium disulfate hydrate, Gypsum Hemihydrate, Plaster of Paris, Calcium Sulfate Hemihydrate Calcined Powder, 10034-76-1
Calcium Sulfate Hemihydrate, also known as Plaster of Paris, is a chemical compound with the formula CaSO₄·0.5H₂O. Here are some key points about it:
Chemical and Physical Properties
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Chemical Formula: CaSO₄·0.5H₂O
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Molecular Weight: 145.15 g/mol
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CAS Number: 10034-76-1
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Appearance: White crystalline powder
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Density: 2.32 g/cm³
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Melting Point: 1450°C
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Solubility: Slightly soluble in water
Uses
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Construction: Used in the production of plaster, drywall, and cement.
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Medical Applications: Used in dentistry for impressions, casts, and as a tablet excipient.
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Art and Craft: Used for making sculptures and molds.
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Industrial Applications: Used as a desiccant and in the production of ceramics.
Other Names
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Plaster of Paris
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Gypsum Hemihydrate
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Calcium Sulfate Hemihydrate
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calcium sulfate hemihydrate
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CAS: 10034-76-1
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Molecular Formula: CaH2O5S
Names and Identifiers
| Name | calcium sulfate hemihydrate |
| Synonyms | Dried gypsum dicalcium disulfate hydrate calcium sulfate hemihydrate Calcium Sulfate Hemihydrate Calcined Powder |
| CAS | 10034-76-1 |
| EINECS | 231-900-3 |
| InChI | InChI=1/Ca.H2O4S.H2O.2H/c;1-5(2,3)4;;;/h;(H2,1,2,3,4);1H2;;/p-2/rCaH2.H2O4S.H2O/c;1-5(2,3)4;/h1H2;(H2,1,2,3,4);1H2/p-2 |
Physico-chemical Properties
| Molecular Formula | CaH2O5S |
| Molar Mass | 154.16 |
| Density | 2.69 g/cm3 |
| Melting Point | 1193℃ |
| Water Solubility | sets to hard mass when mixed with H2O [MER06]; g/100g solution H2O: 1.23 (0°C), 0.71 (25°C), 0.189 (100°C); solid phase, CaSO4 · 1/2H2O [KRU93] |
| Appearance | Form Solid, color White with a blue, gray or red hue |
| Storage Condition | Room Temprature |
| Stability | Stable. Hygroscopic. |
| Physical and Chemical Properties |
properties white powder. |
| Use | Used for building board, also used in agriculture, etcUsed as coagulant of soybean products |
Risk and Safety
| Safety Description | S22 - Do not breathe dust. S24/25 - Avoid contact with skin and eyes. |
| WGK Germany | 1 |
Upstream Downstream Industry
| Raw Materials | Calcium sulfate |
Nature
white powder. Loss of 1/2H20 at 163 °c becomes anhydrous. Insoluble in water (20 ° C. 0.3g]lOOmL water), soluble in acid, ammonium salt, sodium thiosulfate and glycerol. It is mixed with water to form a plastic easily poured mortar, which is hardened into a solid stone-like body after a certain period of time, with a slight volume expansion and heat release. It is a gas-hard building gelling material. Two types of type A and Type B, type a commonly known as high-strength building gypsum, type B commonly known as plaster of Paris or gypsum.
Preparation Method
- rotary kiln calcination method: gypsum is crushed to 1 ~ 3mm and then added to the indirect heating rotary kiln for 15 min, the final temperature of the material was 140-150 °c (115-125 °c for calcined medical gypsum). The clinker was crushed and screened to obtain calcium sulfate hemihydrate.
- pressure method: the raw gypsum is crushed into 15 ~ 20mm and then added to the autoclave, cooked under pressure at a temperature of about 120 °c for about 7h, and then dried at 120~220 °c, after crushing and screening, the expanded calcium sulfate hemihydrate was obtained.
Use
type A is used in construction as a high-strength gypsum component, gypsum board, casting model, and as a fixing glue for machining. Type B is mainly used for building materials, plaster components, gypsum figures, ceramics, precision machinery casting mold, chalk, gelling agents and so on.
Safety
packed in woven bags lined with Kraft or polyethylene plastic bags, each with a net weight of 25kg. Place in a cool, dry warehouse. Moisture and rain should be prevented to avoid caking and deterioration. In case of fire, water can be used for rescue. Dust can cause respiratory diseases. The maximum allowable concentration is 2 mg/m3. Work should protect the respiratory organs, wear work clothes, wear protective glasses. Compliance with personal Protection Measure, the workplace should pay attention to dust and dust.
