Testing that Reaches the World
Clark Laboratories | Hardgrove Grindability Index (HGI)
Analysis for Quality, Environmental Compliance, and Commercial Value
What is HGI Testing?
The Hardgrove Grindability Index (HGI) measures the relative ease with which coal or petroleum coke can be pulverized.
The test provides an index value used to evaluate milling performance and grinding energy requirements.
Why HGI Testing Matters
Grindability directly affects:
- Pulverizer performance
- Mill capacity
- Energy consumption
- Particle size distribution
- Combustion efficiency
Materials with higher HGI values are easier to grind and typically require less energy during processing.
Industries Using HGI Testing
- Power Generation
- Cement Manufacturing
- Refining
- Industrial Boilers
- Commodity Trading
Clark Testing provides HGI testing to support fuel selection, process optimization, and equipment performance evaluations.
› Proximate Analysis Testing
Fuel quality analysis including moisture, ash, volatile matter, and fixed carbon.
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› Sulfur Analysis Testing
Sulfur testing for emissions compliance and product specification verification.
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› Ultimate Analysis Testing
Elemental analysis of carbon, hydrogen, nitrogen, sulfur, and oxygen.
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› BTU & Calorific Value Testing
Measure energy content for fuel valuation and combustion performance.
Why Choose Clark Testing for HGI Testing?
For more than three decades, Clark Testing has provided independent fuel characterization and laboratory testing services for industrial customers throughout North America. Our experienced team delivers accurate Hardgrove Grindability Index (HGI) testing to help customers evaluate fuel handling characteristics, optimize milling operations, and improve overall process efficiency.
Reliable grindability data is essential for selecting fuels, predicting pulverizer performance, controlling operating costs, and maintaining consistent combustion conditions. Clark Testing performs HGI testing using recognized industry methodologies, providing dependable results that support both operational and commercial decision-making.
Clark Testing Advantages
- Independent Third-Party Laboratory
- Experienced Coal, Coke, and Fuel Specialists
- Fast Turnaround Times
- Fuel Performance Evaluation Expertise
- Process Optimization Support
- Commercial Fuel Quality Verification
- Reliable Analytical Results
- Responsive Technical Service
Whether you are evaluating petroleum coke, coal, or other solid fuels, Clark Testing provides the accurate grindability data needed to support equipment performance, fuel procurement, combustion efficiency, and operational reliability.
› Hardgrove Grindability Testing
Evaluate grindability to optimize milling and fuel handling.
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› CRI and CSR Testing
Assess coke reactivity and strength for blast furnace optimization.
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› Ash Fusion Testing
Determine ash melting behavior and slagging potential.
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› Trace Metals Analysis
Analyze nickel, vanadium, mercury, and other trace elements.
Need Petroleum Coke Testing?
Request a quote or speak with a Clark Testing specialist about your project.