The large dimensions of the future X-ray telescopes, with diameters ranging from 3.5 m and up to several meters, will
require the adoption of segmented optics and hence the development of new technologies for their manufacturing.
These technologies are based on lightweight materials and structures to comply with the mass constrains imposed by the
launcher. The Astronomical Observatory of Brera (INAF-OAB) is involved in the development of a glass shaping
technology for the production of grazing incidence segmented optics to be employed onboard the next generation of Xray
Observatories. This technique, named "Hot slumping technology with pressure", is based on the viscosity change of
the glass with the temperature: by applying a suitable thermal cycle the viscosity of the glass is decreased enough to
allow its slumping on a mould so to replicate its shape without significantly degrade its surface finishing. Following this
replication approach, it is possible to obtain, with the same mould, a number of equal mirror segments that will be
integrated and aligned in the telescope aperture so to create a mirror shell in configuration Wolter I. The entire study
has been financed by ESA in the context of the International X-ray Observatory (IXO) mission with the aim of
developing a back-up technology for the IXO mirror manufacturing. The study started in 2009 and it is scheduled to
finish in 2012 with the production of representative module prototypes, named POC and XOU_BB. After a brief review
of past results, this paper reports the latest advancement in the slumping of Schott glass D263 foils on Fused Silica and
Zerodur moulds and its status as for summer 2011.