| Concentration of boric acid (%) | Viscosity (poise) | ||
| PH PVA | FH PVA | M PVA | |
| 0 | 271 | 226 | 3 |
| 0.5 | 300 | 322 | 4 |
| 1 | 472 | 358 | 4 |
| 1.5 | 600 | 568 | 4 |