Part 1: Product Overview

Precipitated Calcium Carbonate (PCC), commonly referred to as light calcium carbonate, is a powdered material produced from limestone and other raw materials through chemical processes including calcination, digestion, carbonation, dehydration, drying and grinding. It is called "light" calcium carbonate because its sedimentation volume (2.4–2.8 mL/g) is higher than that of ground calcium carbonate (1.1–1.4 mL/g) produced by mechanical methods.

Our PCC products are made from selected high-quality limestone ores using advanced precipitation technology. By precisely controlling reaction conditions, we produce PCC with various morphologies, such as spindle, cubic, acicular and chain-like structures.

The products feature high purity (CaCO₃ ≥ 98%), excellent whiteness (≥ 92%), controllable particle size, high oil absorption and low heavy metal content. They are widely used in rubber, plastics, coatings, papermaking, food, pharmaceuticals, toothpaste and many other industries.

Differences Between PCC and GCC

Light Calcium Carbonate (PCC): Produced by chemical synthesis; regular particle shape (mostly spindle-shaped); low bulk density (0.5–0.7 g/cm³); high oil absorption; excellent reinforcing performance.

Ground Calcium Carbonate (GCC): Produced by physical grinding; irregular particle shape; high bulk density (0.8–1.3 g/cm³); low oil absorption; lower cost.

Part 2: Core Advantages & Properties

Chemically Synthesized, Uniform Particles

Produced via precipitation, enabling precise control of particle morphology and size. Conventional PCC is spindle-shaped, with a length of 5–12 μm and diameter of 1–3 μm. Nano-grade products can be cubic, acicular, etc.

High Purity, Low Impurities

CaCO₃ content ≥ 98%. Food-grade and pharmaceutical-grade products have even higher purity, with heavy metals such as lead, arsenic and mercury strictly controlled within safe limits.

High Whiteness, Pure Color

Whiteness of standard PCC reaches 92%–95%, and some high-brightness grades exceed 97%, effectively improving the whiteness and gloss of finished products.

Large Sedimentation Volume, High Oil Absorption

Sedimentation volume: 2.4–2.8 mL/g (3.0–4.0 mL/g for nano-grade). Higher oil absorption than GCC improves wetting and reinforcement in rubber.

Excellent Reinforcement

Provides higher tensile strength, wear resistance and tear strength than pure rubber vulcanizates, with significant reinforcing effects.

Good Thermal Stability

Stable in air; decomposes into calcium oxide and carbon dioxide at 825–896.6 °C. Melting point: 1339 °C. Slightly soluble in water, soluble in acid with CO₂ release.

Safe & Eco-friendly

Non-toxic, odorless and tasteless. Complies with food and pharmaceutical safety standards, suitable for food, medicine, cosmetics and other fields.

Core Indicators of PCC

Item	Unit	Index Range
CaCO₃ content	%	≥ 98.0
Whiteness	%	92–97
Moisture	%	≤ 0.3–0.5
Sedimentation volume	mL/g	2.4–2.8 (3.0–4.0 for nano-grade)
Bulk density	g/cm³	0.5–0.7
pH value	-	8–10
HCl-insoluble matter	%	≤ 0.1–0.2
Residue on sieve (45 μm)	%	≤ 0.5

Note: Actual specifications subject to inspection report.

Part 3: Main Application Fields

Thanks to uniform particles, high purity and good reinforcement, PCC is widely used in traditional and high-end fine chemical industries. Plastics is the largest application, accounting for about 33%.

1. Rubber Industry (Largest Traditional Market)

Calcium carbonate is one of the earliest and most widely used fillers in rubber.

Reinforcement

Improves tensile strength, wear resistance and tear strength.

Cost reduction

Increases volume, saves expensive natural rubber.

Processability

Adjusts consistency, improves processing and vulcanization.

Typical uses

Tires, conveyor belts, hoses, tapes, footwear, sponge, seals, medical rubber products. Used in Tesla Model 3 at about 7.2 kg per vehicle.

2. Plastics Industry

Acts as a skeleton stabilizer for plastic products.

Strengthening & toughening

Improves hardness, rigidity, heat resistance and dimensional stability.

Appearance

Enhances surface gloss and flatness; high whiteness replaces part of white pigment.

Processability

Improves flow and mixing properties.

Typical uses

PVC cables, profiles, pipes, flooring, films, masterbatches, plastic doors and windows.

3. Coatings & Paints

Used as an extender pigment.

Water-based Coatings

Loading 10–20%, anti-settling, easy dispersion, good gloss.

Oil-based Coatings

Loading 10–50%.

Anti-corrosion Coatings

For ships, containers, vehicles, bridges and steel structures.

Typical Uses

Latex paint, primer, topcoat, anti-corrosion paint, powder coating.

4. Papermaking Industry

PCC offers better quality than GCC.

Advantages

Fine particle size, high whiteness, low cost, low foaming, good printability.

Advantages

Spindle ultra-fine PCC improves smoothness and printability of high-grade paper.

Typical uses

Paper filler, coating pigment for art paper, calcium plastic paper.

5. Printing Inks

Advantages: Excellent dispersibility, transparency, gloss, hiding power, ink absorption and drying speed.

Spherical/cubic nano-PCC is widely used in high-quality printing inks.

Provides clear, long-lasting gloss and uniform color.

6. Food & Pharmaceutical Industries (High-end Applications)

Food

Calcium nutritional fortifier: Health foods, flour products, cereals, biscuits, dairy products, soft capsules.

Additive: Alkalinity regulator, dough conditioner, firming agent, leavening agent, anti-caking agent.

Typical uses: Chewing gum, chocolate, yogurt, calcium tablets, jelly.

Pharmaceutical

Calcium supplement for antibiotics (penicillin, streptomycin, oxytetracycline).

Excipient: Neutralizer, filter aid, buffer, solubilizer, filler.

Drug carrier: Hollow structured CaCO₃ for drug delivery and diagnostics.

7. Toothpaste & Daily Chemicals

Toothpaste abrasive: Removes plaque without damaging enamel; good aroma release.

Neutralizes acidity: Mildly alkaline, reduces oral pH and acid plaque.

Cosmetics: Tooth powder, powder, rouge, etc.

8. Sealants & Adhesives

Improves bonding strength, hardness, heat resistance, dimensional stability; reduces shrinkage.

Nano-PCC provides good elasticity, water resistance, air tightness and rheology.

Typical uses: Glass glue, weather strips, construction sealants.

9. Other Industries

Wire & Cable

Improves insulation, compatibility and filling rate, especially for PVC.

Feed Additive

Calcium supplement for livestock; CaCO₃ ≥ 98%, strict heavy metal control.

Ceramics

Uniform cubic CaCO₃ for low-temperature dense ceramics at 600 °C.

Environmental Protection

Neutralizer for wastewater, SO₂ remover in flue gas.

Others

Organic synthesis, metallurgy, glass, asbestos, etc.

Part 4: Product Specifications & Technical Parameters

Product Series

Product Type	Mesh Size	Whiteness	Sedimentation Volume (mL/g)	Main Features	Main Applications
Standard PCC	325, 400	≥ 92%	2.4–2.8	Spindle-shaped, economical	Rubber, plastics, basic coatings
Ultra-fine PCC	600, 800, 1250	≥ 93%	2.5–3.0	Fine particle, good reinforcement	High-grade rubber, plastics, inks
Fine PCC	1500, 2000	≥ 94%	2.6–3.2	Uniform size, good dispersion	High-grade coatings, inks, sealants
Nano PCC	3000, 5000	≥ 95%	3.0–4.0	Cubic/acicular, high performance	Engineering plastics, pharma, electronics
Food-grade PCC	325, 400	≥ 95%	2.4–2.8	Strict heavy metal control	Food additives, calcium tablets, toothpaste
Pharmaceutical-grade PCC	325, 400	≥ 96%	2.4–2.8	High purity, sterile	Pharmaceutical excipients, calcium supplements

Standard PCC Technical Indicators

Item	Index
CaCO₃ (dry basis)	≥ 98.0%
Whiteness	≥ 92%
Moisture	≤ 0.3%
Sedimentation volume	≥ 2.4 mL/g
HCl-insoluble matter	≤ 0.1%
Residue (125 μm)	≤ 0.005%
Residue (45 μm)	≤ 0.5%
Fe content	≤ 0.1%
Mn content	≤ 0.008%
Oil absorption	~48 mL/100g
pH value	8–10

Food-grade PCC (GB 1886.214-2016)

Item	Index
CaCO₃ (dry basis)	98.0%–100.5%
HCl-insoluble matter	≤ 0.2%
Loss on drying	≤ 2.0%
Ba	≤ 300 mg/kg
Cd	≤ 2.0 mg/kg
Total As	≤ 3.0 mg/kg
Pb	≤ 3.0 mg/kg
Hg	≤ 1.0 mg/kg

Feed-grade PCC

Item	Index
CaCO₃ content	≥ 98%
Ca content	≥ 39.2%
Moisture	≤ 1%
HCl-insoluble matter	≤ 0.2%
Heavy metals (as Pb)	≤ 0.003%
As	≤ 0.0002%
Ba salt	≤ 0.030%

Note: Actual specifications subject to inspection report.

Part 5: Comparison Between PCC and GCC

Item	Precipitated Calcium Carbonate (PCC)	Ground Calcium Carbonate (GCC)
Production	Chemical synthesis (precipitation)	Physical ore grinding
Particle shape	Regular: spindle, cubic, acicular	Irregular, angular
Bulk density	0.5–0.7 g/cm³ (low)	0.8–1.3 g/cm³ (high)
Sedimentation volume	2.4–2.8 mL/g (high)	1.1–1.4 mL/g (low)
Oil absorption	High (good reinforcement)	Low
Whiteness	92–97%	89–96%
Moisture	0.3–0.5%	0.2–0.3% (lower)
Price	Higher	Lower
Reinforcement	Significant	Mainly incremental filling
Main applications	Rubber, plastics, coatings, food, pharma	Plastics, coatings, paper, building materials