- All of our black rubber stoppers are laboratory grade.
- They contain a high percentage of pure rubber and are resistant to chemical attack.
- Stopper composition ensures resiliency and pliability over a long period.
- Withstands laboratory conditions without hardening.
- The upper working temperature is 212°F.
Fits these Flasks:
- 250ml Pyrex Erlenmeyer Flask
- 250ml Borosilicate Erlenmeyer Flask
- 250ml Borosilicate Florence Flask
- 250ml Borosilicate Filter Flask
- 500ml Borosilicate Florence Flask
See our Rubber Stopper Size Chart for top, bottom and length specs of our other stoppers.