P18.6
Flowability — Angle of Repose and Carr Index
Procedure 16 of 40 · Chapter 18 · §18.1.6
1 table 0 notes
Table 1
| Carr Index (%) | Hausner Ratio | Flow Character | Powder Detergent Implication |
|---|---|---|---|
| 0–10 | 1.00–1.11 | Excellent | Free-flowing; ideal for automatic filling and dispensing |
| 11–15 | 1.12–1.18 | Good | Suitable for most packaging operations; minimal flow aid required |
| 16–20 | 1.19–1.25 | Fair | Acceptable with minor glidant addition; monitor for segregation |
| 21–25 | 1.26–1.34 | Passable | Requires flow aid (0.5–2% fumed silica); check bulk handling |
| 26–31 | 1.35–1.45 | Poor | Significant flow aid required; risk of bridging in hoppers |
| 32–37 | 1.46–1.59 | Very poor | Difficult to process; reformulation or granulation recommended |
| >38 | >1.59 | Extremely poor | Not suitable for commercial powder processing |