| Cat. No. | Shape | Cone |
| 1220/1 | Hexagonal | B 10 |
| 1220/2 | Hexagonal | B 12 or B 14 |
| 1220/3 | Hexagonal | B 19 |
| 1220/4 | Hexagonal | B 24 |
| 1220/5 | Hexagonal | B 29 |
| 1220/6 | Hexagonal | B 34 |
| 1220/7 | Penny Head | B 40 |
| 1220/8 | Penny Head | B 45 |
| 1220/9 | Penny Head | B 50 |
| 1220/10 | Penny Head | B 55 |
Hollow Glass Stopper
Hollow Glass Stoppers are designed for securely sealing laboratory glassware such as flasks, bottles and reaction vessels. The hollow construction reduces weight while maintaining strength and durability. Manufactured from high-quality borosilicate glass, these stoppers offer excellent resistance to heat and chemicals. Their precision-ground surface ensures a tight, reliable fit, making them suitable for routine laboratory, research and educational applications.
