| 摘要 |
<p>An infrared absorbing glass for a reed switch which has a transmittance for an infrared ray having a wavelength of 1050 nm of 10 % or less at a thickness of 0.5 mm and has a chlorine content of 150 ppm or less. It is preferred that the glass has a coefficient of thermal linear expansion of 85 to 100 x 10-7/°C in the temperature range of 30 to 380 °C. It is more preferred that the glass has the following composition: SiO¿2? 60 to 75 %, Al2O3 1 to 10 %, B2O3 0 to 10 %, RO 3.5 to 10 % (R is one or more elements selected from the group consisting of Ca, Mg, Ba, Sr, Zn), Li2O 0.5 to 5 %, (Na2O + K2O) 8 to 17 %, Fe3O4 2 to 10 %, all percentages being based on the weight of the glass. This infrared absorbing glass can be suitably used for sealing a reed switch which uses a magnetic wire rod made from a Fe-Ni alloy (52 alloy).</p> |
