Quick Answer: The Red Rubber Stoppers Solid 13mm are solid red rubber bungs, 13 mm across the bottom and 16 mm across the top, sized for a 50 ml conical flask or 18 mm diameter test tubes.
Last updated: October 2026
Key Features
Solid red rubber with a Shore hardness of 46-55
Bottom diameter 13 mm, top diameter 16 mm, length 24 mm
Bottom diameter moulded on the top face
Size 13: suits a 50 ml conical flask or 18 mm test tubes
Technical Specifications
Specification
Value
Size
13
Bottom diameter
13 mm
Top diameter
16 mm
Length
24 mm
Shore hardness
46-55
Bung type
Solid, rubber
About This Product
Solid rubber stoppers for closing glassware in the laboratory. The size 13 stopper is suited to a 50 ml conical flask or to test tubes of 18 mm diameter. Its red rubber has a Shore hardness in the 46 to 55 range, and the bottom diameter is moulded on the top face. Export supply of the Red Rubber Stoppers Solid 13mm can be arranged to laboratories and schools in Cameroon, Barbados, Bulgaria, Benin, Jamaica and Ghana.
Frequently Asked Questions
Q1. Which glassware does a size 13 stopper fit? Size 13 stoppers are suited to the 50 ml conical flask or to test tubes with an 18 mm diameter.
