P17.5
Density and Specific Gravity — Hydrometer, Digital Densitometer, and Pycnometer Methods
Procedure 5 of 40 · Chapter 17 · §17.1.6
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Table 1
| Feature | Method A: Hydrometer | Method B: Digital Densitometer | Method C: Pycnometer |
|---|---|---|---|
| Standard | ASTM D1298, ISO 3675 | ASTM D4052, ISO 12185 | ASTM D1217, ISO 3507 |
| Sample volume | 500 mL | 1–2 mL | 10–50 mL |
| Precision (repeatability) | ±0.0005 g/cm³ | ±0.0001 g/cm³ | ±0.00002 g/cm³ |
| Temperature control | ±0.25°C water bath | ±0.02°C internal Peltier | ±0.1°C water bath |
| Measurement time | 15–30 min | 1–3 min | 30–60 min |
| Viscosity limit | 15 000 mm²/s | 15 000 mm²/s | 5 000 mm²/s |
| Operator skill | Moderate | Low (automated) | High |
| Capital cost | Low | High | Low |