Met Coal Quality Parameters Explained: CSR, CRI, Ash, Sulfur and VM
Met coal contracts compress complex coke-making behavior into a handful of lab parameters. CSR and CRI often drive premium pricing as much as ash and sulfur limits.
Metallurgical coal buyers rarely purchase coal in isolation. They purchase expected coke plant performance. That is why CSR and CRI appear beside ash, sulfur, phosphorus, and volatile matter in nearly every met coal specification sheet.
Core parameters and why they matter
- CSR (coke strength after reaction): indicates coke ability to withstand blast furnace conditions
- CRI (coke reactivity index): lower values generally preferred for stable furnace operation
- Ash: affects slag volume, coke yield, and impurity carry-through
- Sulfur: influences environmental compliance and coke quality penalties
- Volatile matter (VM): helps classify coal rank and coking behavior
A single out-of-spec parameter may be manageable through blending at a coke plant. Multiple borderline parameters together can destroy value quickly. Traders evaluating met cargoes should read COA results in combination, not as isolated pass/fail checks.
Need an independent coal cargo, quality, transaction, or demurrage review?
Request a CoalSense Preliminary Risk Screen to organize vessel, quality, and contract facts before exposure escalates.
Request a CoalSense Risk Screen