Potter-Elvehjem Tissue Grinders with PTFE Pestle and Graduated Glass Tube
![Potter-Elvehjem Tissue Grinders with PTFE Pestle and Graduated Glass Tube](https://krackeler.com/tt/lg/graphics/0186/jpg/885510-1.jpg)
A graduated tube and a finely machined PTFE pestle comprise this popular style. Radial serrations on the lower portion of the pestle deliver the homogenate into the cylindrical portion of the tube. Graduations are fused into the glass. Replacement components are available and completely interchangeable. Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements.
- 4mL tubes have a clearance of 0.003-0.005" between pestles and tubes
- 10mL tubes have a clearance of 0.004-0.006" between pestles and tubes
- 30mL tubes have a clearance of 0.005-0.007" between pestles and tubes
- 55mL tubes have a clearance of 0.006-0.009" between pestles and tubes