A subject for the invention is to provide an alkali-free glass which is
capable of reducing or totally eliminating As.sub.2O.sub.3 and which has
fewer bubble inclusion than that in the prior technology.The invention
relates to an alkali-free glass which comprises SiO.sub.2 in an amount of
from 40 to 70% by weight; Al.sub.2O.sub.3 in an amount of from 6 to 25%
by weight; B.sub.2O.sub.3 in an amount of from 5 to 20% by weight; MgO in
an amount of from 0 to 10% by weight; CaO in an amount of from 0 to 15%
by weight; BaO in an amount of from 0 to 30% by weight; SrO in an amount
of from 0 to 10% by weight; ZnO in an amount of from 0 to 10% by weight,
each based on the total amount of said glass, and helium and/or neon in
an amount of from 0.0001 to 2 .mu.l/g (0.degree. C., 1 atm.).