| Glass Sample | Starting glass composition (mol%) | Ratio O/P | DR (g/cm2∙min) | Tg (˚C) | TC (˚C) | TC-TG | pH | |||
| CoO | Na2O | CaO | P2O5 | (±5˚C) | ±0.5 | |||||
| S0 | 0 | 25 | 25 | 50 | 3 | (5.40 ± 0.20) × 10−5 | 377 | 505 | 128 | 6,2 |
| S1 | 5 | 20 | 25 | 50 | (1.69 ± 0.20) × 10−5 | 405 | 524 | 119 | 6,6 | |
| S2 | 10 | 15 | 25 | 50 | (4.83 ± 0.20) × 10−6 | 434 | 555 | 121 | 8,4 | |
| S3 | 15 | 10 | 25 | 50 | (1.55 ± 0.20) × 10−6 | 455 | 570 | 115 | 8,6 | |
| S4 | 25 | 0 | 25 | 50 | (8.60 ± 0.20) × 10−7 | 528 | 661 | 133 | 8,8 | |