Coated Calcium Carbonate

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Coated Calcium Carbonate is a fine, white, odorless powder consisting of naturally occurring ground calcium carbonate (CaCO₃) treated with a surface coating—typically stearic acid or other fatty acids—to enhance compatibility with non-polar matrices. This coating improves dispersion in plastic and rubber formulations, reduces moisture pickup, and enhances the physical properties of the final product. Compared to uncoated grades, coated calcium carbonate offers better hydrophobicity, improved flow properties, and stronger interfacial bonding in polymeric systems. It is widely used in plastics, rubber, paints, sealants, adhesives, paper, and more.

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Categories: Additives, Fillers and Reinforcements Tags: Coated calcium carbonate, Construction materials, Mineral filler, Paints and coatings filler, Plastics and polymer reinforcement, White powder or granules

Description

Coated Calcium Carbonate Uses

Primary Uses

Plastics Industry

Used as a functional filler in polypropylene (PP), polyethylene (PE), PVC, and thermoplastics.
Improves dimensional stability, rigidity, and impact strength.
Enhances dispersion and reduces compound viscosity.
The stearic acid coating increases compatibility with polyolefins and reduces water absorption.
Reduces material cost while maintaining mechanical performance.

Rubber Industry

Acts as a reinforcing agent and processing aid in natural and synthetic rubber.
Improves tensile strength, elasticity, and abrasion resistance.
Enhances surface finish and reduces curing time.
Prevents moisture absorption, improving product shelf-life and consistency.

Paints & Coatings

Used as an extender pigment in architectural and industrial paints.
Provides matting, opacity, and rheological control.
Reduces oil absorption and improves weather resistance in exterior coatings.
In powder coatings, it helps improve flow properties and electrostatic spray behavior.

Adhesives & Sealants

Used to modify rheology and reduce cost.
Improves consistency, thixotropy, and bonding strength.
Prevents cracking and enhances thermal resistance.

Secondary Uses

Cable & Wire Compounding

Filler in sheathing and insulation materials.
Enhances dielectric strength, flame resistance, and processability.
Coated version provides better moisture resistance.

Paper Industry (Limited Use)

Used in specialty papers requiring enhanced smoothness and printability.
Coated calcium carbonate can be employed where improved water resistance is needed.

Masterbatch & Compounding

Used in color and additive masterbatches to ensure uniform dispersion of pigments and fillers.
Aids in maintaining pellet strength and batch consistency.

Construction Materials

Incorporated into dry mix mortars and sealants to enhance flowability and durability.
Contributes to crack resistance and improved surface smoothness.

Inks

Used in some ink systems for its opacity and matting properties while maintaining low viscosity.

PRODUCT KEY FEATURES

1. Basic Identification Attributes

Chemical Name (IUPAC): Calcium Carbonate
Common/Trade Name: Coated Calcium Carbonate
CAS Number: 471-34-1
HS Code: 2836.50.00
Molecular Formula: CaCO₃
Synonyms:
- Surface-treated calcium carbonate
- Stearic acid coated CaCO₃
- Modified calcium carbonate

2. Physical & Chemical Properties

Physical State: Fine powder
Color & Odor: White; odorless
Particle Size (D50): Typically 1–5 microns (varies by grade)
Surface Treatment: Stearic acid (typically 1–2% by weight)
Density: ~2.7 g/cm³
Oil Absorption: Lower than uncoated grades
Moisture Content: <0.5%
pH (10% slurry): 8.5–9.5
Solubility: Insoluble in water; reacts with acids to release CO₂
Stability: Chemically stable under normal conditions

3. Safety & Hazard Attributes

Hazard Class (GHS): Not classified as hazardous
NFPA Ratings:
- Health: 1
- Flammability: 1
- Reactivity: 0
Exposure Limits:
- OSHA PEL: 15 mg/m³ (total dust)
- ACGIH TLV: 10 mg/m³
Toxicity: Non-toxic; may cause mild irritation if inhaled as dust
Reactivity: Inert; reacts with strong acids to release carbon dioxide

4. Storage & Handling Attributes

Storage Conditions: Store in a cool, dry place away from moisture
Container Type: Multi-layer paper or HDPE bags, or bulk containers
Shelf Life: Indefinite if stored properly
Special Handling:
- Use dust extraction during bulk handling
- Avoid breathing dust
- Store away from acids

5. Regulatory & Compliance Attributes

FDA Status: Indirect food additive (restricted uses)
REACH Status: Registered
RoHS/ELV: Compliant
Transportation: Not regulated as hazardous material
Waste Disposal: Dispose according to local regulations; environmentally safe

6. Environmental & Health Impact

Ecotoxicity: Non-toxic to aquatic and terrestrial life
Persistence: Stable and non-reactive in the environment
Bioaccumulation: Does not bioaccumulate
Carcinogenicity/Mutagenicity: Not classified as carcinogenic

Biodegradability: Not biodegradable but environmentally inert

SAFETY HANDLING PRECAUTIONS

Safety Handling Precautions

PPE Requirements:

Dust mask or respirator
Safety goggles
Gloves and protective clothing if prolonged exposure

Handling Measures:

Avoid creating dust clouds
Use adequate ventilation
Avoid contact with eyes and prolonged inhalation of dust

Storage Guidelines:

Keep containers tightly sealed
Store away from moisture and strong acids
Use first-in, first-out inventory rotation

Hygiene Practices:

Wash hands after handling
Avoid eating, drinking, or smoking in handling areas

First Aid Measures

Inhalation: Move to fresh air; seek medical attention if symptoms persist
Skin Contact: Wash with soap and water
Eye Contact: Rinse immediately with water for 15 minutes; seek medical advice if irritation continues
Ingestion: Rinse mouth; not considered toxic, but seek medical advice for large amounts

Firefighting Measures

Fire Hazards: Non-flammable
Extinguishing Media: Use media suitable for surrounding fire
Special Precautions: Avoid dust accumulation in fire-prone areas
Decomposition Products: None under normal fire conditions