Impact resistance of one pint glasses
| Glass type | Batch size | Mean (SD) impact resistance (J) | No intact after 1st attempt | No intact after 2nd attempt |
|---|---|---|---|---|
| N/A = not applicable. | ||||
| Trial annealed | 10 | 1.77 (0.15) | 2 | 0 |
| Trial toughened | 10 | 1.38 (0.22) | 3 | 2 |
| Alternative toughened | 10 | N/A | 10 | 9 |