Patinas for Metal Artists
Barometric Pressure and Humidity
Photo Processes and Formulas
Science Experiments
Laboratory Procedures
Biodiesel Processing
All of our black rubber stoppers are laboratory grade.
These rubber stoppers contain a high percentage of pure rubber and are low in free sulfur. The stopper composition ensures resiliency and pliability over a long period and will withstand laboratory conditions without hardening.
The upper working temperature of these black rubber stoppers is 212°F.
Fits these Flasks:
250ml Pyrex Erlenmeyer Flask 250ml Bomex Erlenmeyer Flask 500ml Bomex Erlenmeyer Flask 250ml Bomex Florence Flask 500ml Bomex Florence Flask
Test Tube Brush, 9 inches Cat. No. - NC-1645 $1.85
Polyethylene Test Tube Rack, 12 place Cat. No. - NC-9503 $5.95
Pyrex Test Tube 20x150mm Cat. No. - NC-0996 $1.85
Splash Goggles, Adult size Cat. No. - NC-2591 $4.95