Guide7.3
Acceptance criteria
Blend uniformity is assessed by the spread of results across the samples, usually as the relative standard deviation (RSD).
| Measure | Typical acceptance criterion |
|---|---|
| Individual results | 90.0–110.0% of the mean (or of target) |
| Relative standard deviation | ≤ 5.0% |
| Visual | Uniform colour and texture; no lumps, streaks or segregation |
RSD (%) = (standard deviation ÷ mean) × 100
A low RSD shows a well-mixed blend. Always apply the criteria in the product specification or validation protocol where they differ from the typical values above.
Did this solve the problem?