Alkali-free glass

The present invention relates to an alkali-free glass having a strain point of 700 DEG C to 740 DEG C (inclusive), a density of 2.6 g/cm3 or less, a Young's modulus of 90 GPa to 100 GPa (inclusive), an average thermal expansion coefficient of 30 * 10 /K to 39 * 10 /K (inclusive) at 50 DEG C to 350 DEG C (inclusive), a temperature T2 at which the glass viscosity reaches 102 dPa.s of 1590 DEG C to 1690 DEG C (inclusive), and a temperature T4 at which the glass viscosity reaches 104 dPa.s of 1350 DEG C or less, the glass has a glass surface devitrification temperature (Tc) of less than T4 + 80 DEG C, a specific modulus of 36 MN m/kg or more, and a prescribed glass composition. 本发明涉及一种无碱玻璃，所述无碱玻璃的应变点为700℃以上且740℃以下，密度为2.6g/cm3以下，杨氏模量为90GPa以上且100GPa以下，50℃～350℃下的平均热膨胀系数为30×10-7/K以上且39×10-7/K以下，玻璃粘度达到102dPa·s时的温度T2为1590℃以上且1690℃以下，玻璃粘度达到104dPa·s时的温度T4为1350℃以下，玻璃表面失透温度(Tc)小于T4+80℃，比模量为36MN·m/kg以上，并且具有规定的玻璃组成。