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LABORATORY GRADE

Calcium Sulphate Dihydrate Extra Pure

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Calcium Sulphate Dihydrate Extra Pure is a high-purity, white crystalline compound commonly used in laboratory settings for controlled experiments involving hydration and crystallization. Also known as gypsum, it serves as a reliable source of calcium and sulfate ions in analytical chemistry and is often used in preparing culture media, setting-time studies, and thermogravimetric analysis. Its stable dihydrate form makes it ideal for demonstrating water crystallization and thermal decomposition when converted to hemihydrate or anhydrous forms. The extra pure grade guarantees minimal impurities, ensuring accuracy in sensitive applications. It should be stored in a cool, dry place to maintain its hydration state and analytical integrity.

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Description

Primary Uses
Standard for Quantitative Analysis

Used as a primary standard in gravimetric and sulfate precipitation experiments due to its known composition and stability.

Casting & Molding Medium

Commonly utilized in preparation of molds and casts for biological specimens, fossils, or impressions during demonstrations and teaching.

Reagent in Chemical Synthesis

Employed as a source of calcium ions in the preparation of other calcium salts under mild aqueous conditions.

Study of Crystallization Processes

Used in crystallography and recrystallization demonstrations, especially to illustrate water of crystallization concepts.

Educational Demonstrations of Hydration/Dehydration

Heated to form calcium sulfate hemihydrate or anhydrous form, demonstrating reversible hydration processes.

Secondary Uses
pH Buffer Component

Occasionally used in combination with other salts to stabilize pH in controlled systems.

Soil Chemistry Simulations

Incorporated in agricultural lab tests to mimic gypsum effects in soil leaching or remediation studies.

Substrate for Microbial Growth Studies

Added to certain growth media to study calcium ion effects on microorganisms (less common).

Thermal Behavior Studies

Included in thermal gravimetric analysis (TGA) to assess water loss upon heating and phase change behavior.

PRODUCT KEY FEATURES

Basic Identification Attributes
Chemical Name: Calcium Sulphate Dihydrate

Chemical Formula: CaSO₄·2H₂O

CAS Number: 10101-41-4

HS Code: 2833.29.90

Grade: Extra Pure (Laboratory Grade)

Synonyms: Gypsum, Hydrated calcium sulfate, Terrestrial gypsum

2. Physical & Chemical Properties
Appearance: White crystalline powder

Odor: Odorless

Molar Mass: 172.17 g/mol

Solubility in Water: Slightly soluble (~0.24 g/100 mL at 25°C)

Density: ~2.32 g/cm³

Melting Point: Decomposes before melting (~1450 °C)

pH (saturated solution): ~6–7
3. Safety & Hazard Attributes
GHS Classification:

Not classified as hazardous under GHS for lab-scale use

GHS Pictograms: None required

Hazard Statements:

May cause mild irritation to eyes or respiratory tract if inhaled as dust

Precautionary Statements:

Avoid generating dust

Use appropriate PPE when handling in powdered form

4. Storage & Handling Attributes
Storage Conditions:

Store in a cool, dry place

Keep container tightly closed

Protect from moisture (to avoid caking or premature dehydration)

Packaging: Plastic jars or poly-lined containers for laboratory use

Handling Precautions:

Use dust masks and eye protection

Avoid inhalation or prolonged contact with skin

5. Regulatory & Compliance Attributes
Transport Classification:

Not regulated as a hazardous material

Disposal Considerations:

Dispose of according to local environmental regulations

Can typically be discarded with regular laboratory waste if uncontaminated

6. Environmental & Health Impact
Toxicity:

Low toxicity; considered safe in small quantities

Ecotoxicity:

Not known to be environmentally hazardous

Biodegradability: Not applicable — inorganic salt

Fumes/Dusts:

Inhalation of fine particulate can be mildly irritating

SAFETY HANDLING PRECAUTIONS

Personal Protective Equipment (PPE):

Wear safety goggles, lab coat, dust mask or respirator (if airborne particles are present), and gloves.

Handling:

Avoid generating dust.

Use only with adequate ventilation or under a fume hood.

Wash hands thoroughly after handling.

Storage:

Store in a cool, dry, and well-ventilated area.

Keep container tightly closed when not in use.

Protect from moisture to avoid clumping or caking.

FIRST AID MEASURES
Inhalation:

Move person to fresh air.

Seek medical advice if respiratory symptoms develop.

Skin Contact:

Wash thoroughly with soap and water.

Remove contaminated clothing.

If irritation occurs, get medical advice.

Eye Contact:

Rinse cautiously with plenty of water for at least 15 minutes.

Remove contact lenses if present and easy to do.

Seek medical attention if irritation persists.

Ingestion:

Rinse mouth with water.

Drink water to dilute.

Not expected to be toxic, but seek medical attention if symptoms occur.

FIRE FIGHTING MEASURES
Flammability:

Non-flammable.

Extinguishing Media:

Use water spray, foam, dry chemical, or CO₂ — appropriate for surrounding fire.

Hazardous Combustion Products:

May emit sulfur oxides when heated to decomposition.

Firefighter Protection:

Wear SCBA and full protective gear if involved in fire conditions.

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