Calcium Carbonate (Uncoated)

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Calcium Carbonate (uncoated) is a naturally occurring mineral compound composed primarily of calcium, carbon, and oxygen with the chemical formula CaCO₃. It appears as a fine white powder or granules, widely used as a filler, pigment, and functional additive across various industries. The uncoated form means the calcium carbonate particles are not surface-treated, retaining their natural properties. It is valued for its high brightness, whiteness, and excellent compressibility. Uncoated calcium carbonate is used to enhance opacity, improve processing, and reduce costs in plastics, paints, coatings, adhesives, rubber, paper, and construction materials.

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Categories: Admixtures, Animal Feed Additives, Fillers and Reinforcements, Nutrient Supplements, Pigments, Soil Conditioners Tags: Calcium carbonate, Filler in plastics and rubber, Paints and coatings additive, White fine powder

Description

Primary Uses

Plastics & Polymers
- Used as an inexpensive filler and reinforcing agent in thermoplastics and thermosetting resins (polyethylene, polypropylene, PVC).
- Enhances stiffness, impact resistance, and dimensional stability.
- Improves processing and reduces production costs.
Paints & Coatings
- Acts as a pigment extender and filler in water-based and solvent-based paints.
- Provides improved opacity, brightness, and scrub resistance.
- Enhances rheology and flow properties of coatings.
Paper Industry
- Serves as a coating pigment and filler to improve brightness, opacity, and printability.
- Improves surface smoothness and ink holdout.
Rubber Industry
- Used as a filler to improve hardness and mechanical properties in rubber products.
- Reduces production costs and enhances product performance.
Construction Materials
- Integral component in cement, mortar, and concrete mixes as a filler and extender.
- Improves workability and mechanical properties.

Secondary Uses

Agriculture
- Used as a soil conditioner and neutralizing agent to adjust soil pH.
- Acts as a calcium supplement in animal feed.
Pharmaceuticals & Food
- Used as an antacid and calcium supplement in pharmaceutical formulations (subject to purity standards).
- Utilized as a food additive (E170) in baking powders, chewing gum, and confectionery.
Environmental Applications
- Used for water treatment and flue gas desulfurization.

PRODUCT KEY FEATURES

Key Attributes

1. Basic Identification Attributes

Chemical Name (IUPAC): Calcium carbonate
Common/Trade Name: Calcium Carbonate (Uncoated)
CAS Number: 471-34-1
HS Code: 2836.50.00
Molecular Formula: CaCO₃
Synonyms:
- Limestone powder
- Chalk powder
- Calcite
- Ground calcium carbonate (GCC)

2. Physical & Chemical Properties

Physical State: Fine powder or granular solid
Color & Odor: White; odorless
Melting Point: Decomposes at ~825°C (releases CO₂)
Boiling Point: Not applicable (decomposes before boiling)
Density: Approx. 2.7–2.9 g/cm³
Solubility: Insoluble in water; soluble in acids with effervescence
pH: Slightly alkaline (pH ~9 when dispersed in water)
Stability: Chemically stable under normal conditions

3. Safety & Hazard Attributes

Hazard Class (GHS): Not classified as hazardous; nuisance dust
NFPA Ratings:
- Health: 1
- Flammability: 0
- Reactivity: 0
Exposure Limits: OSHA PEL for calcium carbonate dust: 15 mg/m³ (total dust)
Toxicity: Low acute toxicity; inhalation of fine dust may cause respiratory irritation
Reactivity: Stable; reacts with acids releasing CO₂ gas

4. Storage & Handling Attributes

Storage Conditions: Store in a cool, dry, well-ventilated area away from moisture
Container Type: Bags, bulk containers, or silos designed to minimize dust loss
Shelf Life: Indefinite if stored properly
Special Handling: Use PPE to avoid dust inhalation; handle to minimize dust generation

5. Regulatory & Compliance Attributes

FDA Status: Approved for use in food and pharmaceuticals when meeting purity standards
Transportation: Not classified as hazardous
Waste Disposal: Dispose as non-hazardous industrial waste according to local regulations

6. Environmental & Health Impact

Ecotoxicity: Low; naturally occurring mineral with minimal environmental impact
Persistence: Persistent; does not biodegrade but is chemically inert
Bioaccumulation: Not expected to bioaccumulate
Carcinogenicity/Mutagenicity: Not classified as carcinogenic or mutagenic
Biodegradability: Not biodegradable

SAFETY HANDLING PRECAUTIONS

Safety Handling Precautions

Personal Protective Equipment (PPE):

Dust mask or respirator (NIOSH-approved)
Gloves
Protective goggles
Protective clothing

Handling Measures:

Avoid inhalation of dust
Use dust extraction or local exhaust ventilation
Handle in well-ventilated areas

Storage Measures:

Store away from moisture and incompatible materials (strong acids)
Keep containers tightly closed

Hygiene Practices:

Wash hands after handling
Do not eat, drink, or smoke during handling

First Aid Measures

Inhalation: Move to fresh air; seek medical attention if respiratory symptoms persist
Skin Contact: Wash with soap and water; seek medical advice if irritation occurs
Eye Contact: Rinse thoroughly with water for at least 15 minutes; seek medical attention if irritation persists
Ingestion: Generally non-toxic; rinse mouth and seek medical attention if large quantities ingested

Firefighting Measures

Fire Hazards: Non-flammable
Extinguishing Media: Use water spray, foam, dry chemical, or CO₂ as appropriate for surrounding fire
Special Precautions: None; carbon dioxide may be released if heated to decomposition
Decomposition Products: Carbon dioxide (CO₂) upon thermal decomposition