Low thermal expansion glass for sealing/coating

Disclosed is a sealing/coating material which does not contain lead oxide or alkali metal oxide, can be fired at a relatively low temperature, has excellent acid resistance, and has a relatively low coefficient of thermal expansion. A sealing/coating glass which does not substantially contain lead oxide or alkali metal oxide, and which contains, in mol%, 30-55% of SiO2, 1-17% of Al2O3, 2-28% of B2O3, 0-14% of ZnO, 5-25% in total of at least one of MgO and CaO, and 0-12% of Bi2O3, the total content of SiO2 and B2O3 being 50 mol% or more. 本发明公开了一种不含氧化铅或碱金属氧化物、可以在较低温度下烧成、耐酸性优异、热膨胀系数较低的封接/被覆用材料。一种封接/被覆用玻璃，其实质上既不含氧化铅也不含碱金属氧化物，以摩尔％计含有SiO2：30～55％、Al2O3：1～17％、B2O3：2～28％、ZnO：0～14％、MgO和CaO中的至少1种：合计5～25％、Bi2O3：0～12％，且SiO2和B2O3的合计含量在50摩尔％以上。