- All of our black rubber stoppers are laboratory grade.
- They are made of solid natural rubber that stays pliable over a long period of time.
- Ideal for use with non-aggressive or concentrated solutions. Low sulfur content.
- Withstands laboratory conditions without hardening.
- Working temperatures from –25 to 70°C (–13 to 158°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.