Glass materials for capillaries
Fig. 1 Glass materials for capillaries manufactured at Nakahara Opto-Electronics Laboratories, Inc. (NOEL).
Nakahara Opto-Electronics Laboratories, Inc. (NOEL) manufactures and distributes capillaries primarily made of vitreous silica and borosilicate glass (Fig. 1).
There are various types of vitreous silica each having different properties. Typically, the softening temperature of vitreous silica is ~1,700 °C, and hence, vitreous silica exhibits a significantly higher thermal stability in comparison with other glass materials. Transparency is significantly improved in vitreous silica when compared with normal glass materials used for windows, allowing ultraviolet rays to pass through easily. Furthermore, vitreous silica is lead-free, and the levels of impurities such as transition metals and alkali elements are tremendously low, typically in the order of ppm or ppb levels. Therefore, any vitreous silica is considered to exhibit excellent properties for various capillary applications.
However, careful selection of the type of vitreous silica may be necessary in semiconductor and high-power laser applications and for elemental analysis at ultrahigh sensitivities (Fig. 1).
Borosilicate glass exhibits superior heat resistance properties second to vitreous silica. With a softening temperature of 820 °C, borosilicate glass also demonstrates a higher thermal stability than normal glass materials. Typically, borosilicate glass is used as a heat resistance glass often found in laboratory glassware. Capillaries made from borosilicate glass are widely used as fiber arrays to connect optical fibers to optical waveguides, and also used in certain medical applications such as high-precision manipulator for artificial insemination.
NOEL also manufactures capillaries derived from special glass materials such as fluorine-doped silica glass, BK-7 and glasses containing rare earth elements. If you are unsure about what glass materials to use to satisfy your requirements, please feel free to contact us at: Contact Form.
General information on the manufacturing method and properties of vitreous silica and borosilicate glasses are described below: