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Kimble™ Kontes™ Potter-Elvehjem Tissue Grinders, PTFE Pestle and Unground Glass Tube

To progressively ground the sample into smaller pieces

Manufacturer: kimble™  8860000021

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Catalog No. K8860000021


Description & Specifications


Diameter (Metric) Shaft 6mm
Capacity (English) 0.16 oz.
Diameter (English) Shaft 0.23 in.
Capacity (Metric) 5mL
Clearance (English) 0.004 to 0.006 in.
Clearance (Metric) 0.1 to 0.15mm
Includes PTFE pestle and ungrounded Glass tube
Length (English) Pestle 8.46 in.
Length (English) Tube 5.51 in.
Length (Metric) Pestle 215mm
Length (Metric) Tube 140mm
Tube Diameter (English) Outside 0.59 in.
Tube Diameter (Metric) Outside 15mm
Capacity 0.16 oz., 5mL

Tissue grinders produce homogenates by a combination of shearing and compression actions. The tissue sample is progressively ground (sheared) into smaller pieces at the rounded and of the pestle as the spinning pestle is lowered into the tube. As the pestle is forced lower into the tube, the sample is displaced and forced between the straight outside wall of the pestle and the inside wall of the tube, compressing the tissue cells untill they rupture. When the tube is pulled away from the pestle, a slight vacuum is created that pulls the sample back past the compression area, resulting in an additional homogenization stroke.

The degree of homogenization is controlled by the clearance between the pestle's and tube's cyclindrical section (radial distance usually 0.002 to 0.003 inches), the rotational speed of the pestle and the number of compression strokes made.

  • Sizes 21 to 24 have radial serrations on the lower portion of the pestle to deliver the homogenate into the cylindrical portion of the tube
  • Clearance between pestles and tubes is 0.004 to 0.006 in.
  • Replacement components are available and completely interchangeable
  • The lower portion of the pestle is round shaped
  • Ground glass pestle versions are suited for connective tissues
  • PTFE pestle versions are used with softer tissues