Classes of SRF according to ISO 21640:2021
| Classification characteristics | Statistical measures | Unit | Classes | ||||
|---|---|---|---|---|---|---|---|
| 1 | 2 | 3 | 4 | 5 | |||
| NCV (economics) | mean | MJ/kg | ≥25 | ≥20 | ≥15 | ≥10 | ≥3 |
| Cl (technological) | mean | % in mass (dm) | ≤0.2 | ≤0.6 | ≤1.0 | ≤1.5 | ≤3 |
| Hg (environmental) | median | mg/MJ | ≤0.02 | ≤0.03 | ≤0.05 | ≤0.10 | ≤0.15 |
| 80th percentile | mg/MJ | ≤0.04 | ≤0.06 | ≤0.10 | ≤0.20 | ≤0.30 | |
| mean | MJ/kg | ≥25 | ≥20 | ≥15 | ≥10 | ≥3 | |
| mean | % in mass (dm) | ≤0.2 | ≤0.6 | ≤1.0 | ≤1.5 | ≤3 | |
| median | mg/MJ | ≤0.02 | ≤0.03 | ≤0.05 | ≤0.10 | ≤0.15 | |
| 80th percentile | mg/MJ | ≤0.04 | ≤0.06 | ≤0.10 | ≤0.20 | ≤0.30 | |
Note(s): dm = dry matter
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