Calcium Sulfate Hemihydrate, Dicalcium Disulfate Hydrate, Gypsum Hemihydrate, 10034-76-1

Calcium Sulfate Hemihydrate, Dicalcium Disulfate Hydrate, Gypsum Hemihydrate, 10034-76-1

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.