The present study focuses on the blast wave parameters of pentaerythritol tetranitrate (PETN) with silicon rubber (SR) as a binder. It is able to change the mass, the shape and density of explosives. In this study, in order to confirm the effect of the binder on the strength of blast waves, the mixing ratio was changed as PETN/SR=50/50, 70/30, 100/0 wt.%. Blast wave pressures were measured in free air and on a rigid surface. The experimental results indicate that the PETN/SR explosives can detonate even only 1g of PETN/SR=70/30 wt.%. In addition, the mixing ratio was found not to affect the blast waves parameters, which indicates that the silicon rubber had no significant effect on the blast wave. Both the experimental and numerical results indicate that the blast wave parameters can be estimated to a sufficient degree of accuracy based only on the PETN mass.