P19.2
Emulsion Stability — Centrifuge Test
Procedure 24 of 40 · Chapter 19 · §19.1.2
1 table 0 notes
Table 1
| Parameter | Test method | Acceptable range | Notes |
|---|---|---|---|
| Cationic active matter | P19.1 (ISO 2871-1) | % of declared value | Declared value = formulation target (typically 5–20 % w/w) |
| pH, neat product | ISO 4316, 25 °C | 2.5 – 4.0 | Lower pH ensures esterquat hydrolytic stability; pH > 4.5 risks microbial growth |
| Viscosity | Brookfield LVT, spindle #2, 30 RPM, 25 °C | 50 – 800 cP | Accommodates pourable liquids to thicker concentrates |
| Emulsion stability (CI) | P19.2 (3,000 RPM, 30 min) | % | > 5 % indicates phase separation risk on storage |
| Thermal stability | 45 °C, 28 days | CI change %; no visible separation | Accelerated shelf-life indicator |