  Highly porous small bodies are thought to have been ubiquitous in the early
solar system. Therefore, it is essential to understand the collision process of
highly porous objects when considering the collisional evolution of primitive
small bodies in the solar system. To date, impact disruption experiments have
been conducted using high-porosity targets made of ice, pumice, and glass, and
numerical simulations of impact fracture of porous bodies have also been
conducted. However, a variety of internal structures of high-porosity bodies
are possible. Therefore,laboratory experiments and numerical simulations in the
wide parameter space are necessary.
  In this study, high-porosity targets of sintered hollow glass beads and
targets made by mixing perlite with hollow beads were used in a collision
disruption experiment to investigate the effects of the mixture on collisional
destruction of high-porosity bodies. Among the targets prepared under the same
sintering conditions, it was found that the targets with more impurities tend
to have lower compressive strength and lower resistance against impact
disruption. Further, destruction of the mixture targets required more impact
energy density than would have been expected from compressive strength. It is
likely that the perlite grains in the target matrix inhibit crack growth
through the glass framework. The mass fraction of the largest fragment
collapsed to a single function of a scaling parameter of energy density in the
strength regime ({\Pi}_s) when assuming ratios of tensile strength to
compressive strength based on a relationship obtained for ice-silicate
mixtures.
