This capillary tube, made of borosilicate glass, has a diameter of 1.15 mm and length 75 mm. The thickness of the glass is 0.25 mm. Both ends of the tube are open. It is used to transport fluids in very small amounts in experiments like Paper chromatography. Pack of 100.

To seal one end of the tube, put the end of the tube in the flame of a burner by constantly rotating it. Hold the end of the tube vertically in the hottest part of the flame to avoid bending.