To cut capillary tubes, special blades are required, which are made of a material that is harder than glass. Normally, blades with an extremely hard diamond edge are used. However, zirconium oxide blades are a less expensive and convenient alternative. They are also very hard, and can be sharpened easily at any time by simple regrinding. These blades are excellently suited for cutting glass capillaries, as the flat blade can be drawn accurately across the glass surface. Moreover, the capillaries can be parted cleanly at the incision point.
This method can even be used on extremely fine test tubes with wall thicknesses of only 0,01 mm. For convenient and secure use in one hand, the blades can be clamped into our aluminium blade holders. Therefore, we recommend requesting the blade holder as well.