Alkali-free glass and application of alkali-free glass to substrates of flat-panel displays

The invention discloses alkali-free glass. The alkali-free glass comprises, by weight, 100 parts of SiO2, 25-45 parts of Al2O3, 1-10 parts of MgO, 2-15 parts of CaO, 1-5 parts of TiO2 and 0.5-5 parts of V2O5. An R which is computed by the aid of a formula of R=0.206w*(Al2O3)+0.4w*(MgO)-0.007w*(CaO)+0.2w*(TiO2)+0.143w*(V2O5) is 7.5-12. The alkali-free glass has the advantages that the alkali-free glass is high in chemical stability, accordingly, the problem of deterioration of the surface quality of glass of glass substrates due to thinning procedures in the prior art can be solved, glass substrates can have target thicknesses by the aid of thinning treatment on the premise that the quality of the glass substrates is guaranteed, and flat-panel display glass can be lightened and thinned; the alkali-free glass has a high strain point and high Young's modulus and is excellent in performance and wide in application range.