Full Length Standard Taper Glass Stoppers
Pennyhead stoppers can be used with laboratory glassware such as flasks and separatory funnels.
- Sizes Standard Taper 10/30 through Standard Taper 19/38 are solid
- Sizes Standard Taper 24/40 and larger are hollow
- Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements