Calcium Sulfate Hemihydrate, Calcium Sulfate Dihydrate, Calcium Sulfate Anhydrous, Dicalcium Disulfate Hydrate, 10034-76-1, 10034-76-1, 7778-18-9, 10101-41-4

Calcium Sulfate Hemihydrate, Calcium Sulfate Dihydrate, Calcium Sulfate Anhydrous, Dicalcium Disulfate Hydrate, 10034-76-1, 10034-76-1, 7778-18-9, 10101-41-4

Calcium sulfate forms and their CAS numbers:

Notes

• Anhydrous: Often used as a desiccant or in specialty industrial applications.

• Hemihydrate: Reacts with water to form a hard solid, widely used in construction and casting.

• Dihydrate

General Description

• Chemical Name: Calcium Sulfate Hemihydrate

• CAS No: 10034-76-1

• Formula: CaSO₄·½H₂O

• Other Names: Plaster of Paris, Paris Plaster, Calcined Gypsum

• Appearance: White crystalline powder

• Purity: Technical grade 85–95%, laboratory grade ≥98%

• Key Property: Slightly soluble in water, fast-setting, ideal for molding and filler applications

Technical Properties

Applications

1. Dentistry & Medical → Prosthetic casting, orthopedic plaster, dental modeling

2. Laboratory → Desiccant in desiccators, reagent carrier, filler in analytical chemistry

3. Construction → Plaster of Paris for wall repair, decorative coatings, fire-resistant panels

4. Ceramics & Glass → Mold casting, surface leveling, porcelain and tile production

5. Agriculture → Soil conditioner, calcium source, sodium reduction in saline soils

6. Pharmaceuticals & Cosmetics → Tablet binder (limited use), filler, dermatological masks

7. Pigments & Dyes → Carrier in pigment dispersions, viscosity control, color stabilization

8. Non-food Additives → Paper, cardboard, plastics, rubber, adhesives, and putties as filler

Alternatives

• Calcium Sulfate Dihydrate (CaSO₄·2H₂O): Slower setting, gypsum stone form

• Calcium Sulfate Anhydrite (CaSO₄): Water-free form, used as a drying agent

• Magnesium Sulfate (MgSO₄): Agricultural alternative, different ionic profile

• Sodium Sulfate (Na₂SO₄): Used in detergents and textiles as a carrier

Production

• Source: Natural gypsum (CaSO₄·2H₂O)

• Process: Heating dihydrate at 150–180°C → hemihydrate form

• Producers: Sasol, Merck, Brenntag, Ataman Kimya, Anhydritec

Sectoral Suitability

Summary

Calcium Sulfate Hemihydrate is a fast-setting, detail-preserving material widely used in dentistry, construction, laboratories, and ceramics. It plays a critical role in mold-making and plaster applications. While useful in agriculture and pharmaceuticals, its use is limited in those sectors. It is not suitable for food applications, where the dihydrate form is preferred.

General Description

• Chemical Name: Calcium Sulfate Hemihydrate

• CAS No: 10034-76-1

• Formula: CaSO₄·½H₂O

• Other Names: Plaster of Paris, Calcined Gypsum

• Appearance: White crystalline powder

• Purity: Technical grade 85–95%, laboratory grade ≥98%

• Key Property: Slightly soluble in water, fast-setting, ideal for molding and filler applications

1. Dentistry & Medical

• Application: Prosthetic casting, dental modeling, orthopedic plasters.

• How to Use: Mix powder with water to form a paste; sets quickly and captures fine details.

• Typical Amounts:

  • Dental models: 100–200 g powder / 70–100 ml water per mold.

  • Orthopedic casts: 2–5 kg powder / 1–2 L water per limb.

• Note: High-purity hemihydrate is required for dental use; dihydrate is unsuitable due to slower setting.

2. Laboratory & Analytical Chemistry

• Application: Desiccant in desiccators, reagent carrier, filler.

• How to Use: Place powder directly in desiccator trays or mix into analytical formulations.

• Typical Amounts:

  • Desiccators: 200–500 g per unit.

  • Reagent carrier: 5–15% of mixture.

• Note: Anhydrite is stronger as a drying agent, but hemihydrate offers balanced moisture absorption.

3. Construction & Restoration

• Application: Plaster of Paris for wall repair, decorative coatings, fire-resistant panels.

• How to Use: Mix with water, apply to surfaces; sets in 5–10 minutes.

• Typical Amounts:

  • Wall repair: 1–2 kg per m².

  • Decorative plaster: 3–5 kg per m².

  • Fire panels: 20–30% filler content.

• Note: Prepare in small batches due to rapid setting.

4. Ceramics & Glass

• Application: Ceramic molds, porcelain casting, glass surface leveling.

• How to Use: Mix with water, pour into mold forms.

• Typical Amounts:

  • Ceramic molds: 2–4 kg per mold.

  • Porcelain casting: 10–15% additive.

• Note: Fine-ground hemihydrate ensures high detail transfer.

5. Agriculture

• Application: Soil conditioner, calcium source, sodium reduction in saline soils.

• How to Use: Apply directly to soil or dissolve in irrigation water.

• Typical Amounts:

  • Soil conditioning: 200–500 kg per hectare.

  • Calcium supplementation: 50–100 kg per hectare.

• Note: Dihydrate is more common in agriculture; hemihydrate dissolves faster but has shorter effect.

6. Pharmaceuticals & Cosmetics

• Application: Tablet binder, filler, dermatological masks.

• How to Use: Blend into formulations as binder or filler.

• Typical Amounts:

  • Tablets: 2–5% binder.

  • Cosmetic masks: 10–20 g per application.

• Note: Not used as food additive; dihydrate (E516) is approved for food.

7. Pigments & Dyes

• Application: Pigment carrier, viscosity control, color stabilization.

• How to Use: Add to pigment dispersions.

• Typical Amounts:

  • Pigment mixtures: 10–25% additive.

• Note: Improves stability and reduces production costs.

8. Non-Food Industrial Additives

• Application: Paper, cardboard, plastics, rubber, adhesives, putties.

• How to Use: Incorporated as filler or hardness regulator.

• Typical Amounts:

  • Paper/Cardboard: 5–15% filler.

  • Plastics/Rubber: 10–20% additive.

  • Adhesives/Putties: 15–25% additive.

Summary

• Essential Sectors: Dentistry, construction, laboratory, ceramics.

• Limited Use: Agriculture, pharmaceuticals, cosmetics.

• Not Suitable: Food applications (dihydrate form is used instead).

• Typical Usage Range: 5–30% additive or 100 g–500 kg depending on sector.