Best quality red rubber. Shore hardness in range 46-55. Bottom diameter moulded on top face. Resistant to dilute acids, alkalis and ammonia.
Bottom Diameter: 13mm
Top Diameter: 16mm
Length: 24mm
Temperature Range: -30°C – 70°C
Pack of 10
Size 13 stoppers are ideal to use with the Pyrex HD NM Conical Flask 50mL or 16mm diameter test tubes.



































