Mineral Quality Analysis: How to Evaluate a GCC Supplier’s Technical Data Sheet (TDS) A Technical Data Sheet (TDS) is more than just a document; it is a “technical contract” between a supplier and a manufacturer. When you receive a TDS for Ground Calcium Carbonate (GCC), you are looking at the DNA of your future product. Whether you are formulating a new paint, extruding PVC pipes, or creating high-strength adhesives, your success depends on your ability to perform a proper Mineral Quality Analysis of that sheet.

At HERBOCAL, we believe that transparency is the ultimate form of quality. We don’t just send numbers; we send a promise of performance. In this guide, I will walk you through the most critical parameters you should look for in a TDS and how to interpret them like a pro.

In industrial manufacturing, assumptions are expensive—and uncertainty is even more costly.

A Technical Data Sheet (TDS) is not just a document attached to a shipment; it is a technical contract that defines the performance, consistency, and reliability of your raw material. For Ground Calcium Carbonate (GCC), the TDS represents the “DNA” of your formulation.

Whether you are producing high-gloss coatings, rigid PVC compounds, or advanced adhesives, your ability to interpret a TDS correctly determines:

• Product quality consistency
• Production efficiency
• Equipment lifespan
• Cost control

This is where Mineral Quality Analysis becomes a critical skill.

This guide breaks down every key parameter in a GCC TDS—helping you read between the numbers, identify risks, and make confident procurement decisions.

---

1. Chemical Composition: The Foundation of Material Integrity

The first step in any Mineral Quality Analysis begins with chemistry.

---

✔ Calcium Carbonate (CaCO₃) Content

• Target: ≥ 98.5%

This value defines the purity of the material.

---

Why It Matters

High CaCO₃ purity ensures:

• Chemical stability in formulations
• Minimal interaction with additives
• Predictable processing behavior

Lower purity introduces unknown variables that can disrupt performance.

---

✔ Impurities: The Hidden Variables

Magnesium Oxide (MgO)

• Affects crystalline structure
• Can alter mechanical properties

Iron Oxide (Fe₂O₃)

• Causes discoloration (yellowing or greying)
• Reduces visual quality

Silicon Dioxide (SiO₂)

Silica is one of the most critical risk factors in GCC.

---

Operational Risk of High Silica

• Acts as an abrasive material
• Accelerates wear in screws and molds
• Increases maintenance costs

---

Procurement Insight

A high-quality TDS always includes a complete impurity profile—not selective data.

---

2. Particle Size Distribution (PSD): The Core Performance Indicator

If chemical composition defines purity, PSD defines functionality.

---

Understanding the D-Values

D50 (Median Particle Size)

• Represents the midpoint of particle distribution
• Defines general performance behavior

---

D97 (Top Cut)

• Indicates the maximum particle size
• Controls presence of coarse particles

---

Why D97 Is Critical

A high D97 leads to:

• Surface roughness
• Poor dispersion
• Defects in films and coatings

---

✔ The Ideal Scenario: Narrow Distribution

A “narrow PSD” means:

• Most particles fall within a tight size range
• Minimal deviation from target size

---

Industrial Benefits

• Smooth surface finish
• Better packing density
• Consistent processing

---

Advanced Insight

Suppliers using modern classification systems can maintain identical PSD curves across batches—this is a key indicator of process control.

---

3. Optical Properties: Controlling Cost Through Color

In many applications, GCC is not just a filler—it is a cost optimization tool.

---

✔ Brightness (Ry or L Value)

• High-quality GCC: 96% – 98% brightness

---

✔ Whiteness Index

Measures how close the material is to pure white.

---

Why Optical Properties Matter

High brightness allows partial replacement of Titanium Dioxide, one of the most expensive components in coatings and plastics.

---

Business Impact

• Reduced pigment consumption
• Lower formulation cost
• Improved product appearance

---

4. Oil Absorption: The Efficiency Multiplier

Oil absorption is one of the most overlooked yet financially critical parameters in Mineral Quality Analysis.

---

✔ What It Measures

The amount of liquid (resin or binder) required to wet the powder surface.

---

✔ Target Outcome

• Low and consistent oil absorption

---

Why It Matters

High oil absorption results in:

• Increased resin consumption
• Higher production cost
• Reduced formulation efficiency

---

Performance Insight

Particles with smoother surfaces and controlled morphology typically exhibit lower oil absorption.

---

5. Moisture Content: The Invisible Risk Factor

Moisture is often underestimated—but its impact can be severe.

---

✔ Acceptable Range

• Target: ≤ 0.2%

---

Risks of High Moisture

• Bubble formation in plastics
• Voids and structural defects
• Poor adhesion in coatings
• Processing instability

---

Operational Impact

Even small increases in moisture can:

• Disrupt production lines
• Increase rejection rates
• Reduce product reliability

---

Best Practice

Always verify moisture data in the TDS and confirm drying capabilities with the supplier.

---

6. Surface Treatment: Coated vs. Uncoated GCC

The TDS should clearly specify whether the material is surface-treated.

---

✔ Coated GCC

Typically treated with stearic acid.

Benefits

• Improved dispersion in polymers
• Reduced melt viscosity
• Enhanced compatibility with plastics

---

✔ Uncoated GCC

Preferred for:

• Water-based paints
• Paper applications
• Construction materials

---

Procurement Insight

The correct choice depends entirely on your application—not price or availability.

---

7. Reading Between the Lines: Identifying Red Flags

A professional Mineral Quality Analysis goes beyond reading numbers—it involves evaluating credibility.

---

⚠ Warning Signs in a TDS

1. Vague Ranges

• Example: “Brightness: 90% – 98%”
• Indicates poor process control

---

2. Missing Data

• No silica or moisture values
• Suggests incomplete transparency

---

3. Outdated Reports

• Old test data
• Lack of batch-specific validation

---

4. No PSD Curve

• Only average size provided
• Hides distribution variability

---

Key Insight

A reliable supplier provides precise, recent, and complete data—not generalized claims.

---

8. The Role of Certification and Documentation

A high-quality TDS should be supported by recognized standards such as those set by the International Organization for Standardization.

---

✔ Supporting Documents

• Certificate of Analysis (COA) per batch
• ISO 9001 compliance
• REACH documentation (for EU markets)

---

Why It Matters

Documentation ensures:

• Traceability
• Accountability
• Consistency

---

Quick Reference: TDS Evaluation Checklist

---

Common Mistakes When Reading a TDS

Even experienced professionals can overlook critical details:

• Focusing only on price, not specifications
• Ignoring PSD distribution
• Overlooking impurity levels
• Assuming consistency without proof
• Accepting incomplete documentation

Avoiding these mistakes can significantly improve production outcomes.

---

Conclusion: From Data to Decision

A Technical Data Sheet is more than a document—it is a decision-making tool that directly influences your product’s success.

By mastering Mineral Quality Analysis, you gain the ability to:

• Select the right material with confidence
• Prevent costly production issues
• Optimize formulations
• Protect your equipment and investment

The difference between average and exceptional manufacturing often lies in how well you understand your raw materials.

If you want to eliminate uncertainty and make data-driven sourcing decisions, it is time to work with a supplier who values transparency and precision.

Choose a partner who provides:

• Complete and accurate TDS documentation
• Verified laboratory data
• Consistent batch performance
• Full technical support

Upgrade your Mineral Quality Analysis capabilities today—and turn every specification into a competitive advantage.