P-33
High silica core type with intermediate particle size distribution and excellent high temperature stability. Used for DS and SX applications where there are blind passages and core leachability is a concern.

P-77
High silica core type with a very fine particle size distribution. Used for DS and SX applications with very thin cross sections.

K-120
Silica zircon core type with an intermediate particle size distribution and excellent high temperature stability. Used for high temperature preheat processes in equiax casting, for large land-based turbines, and for DS and SX applications where a silica/zircon composition is a better match to the casting process than an all silica composition.

K-275
Small, thin cross section parts where good thermal stability is required. Used for high temperature preheat applications in equiax casting or in DS and SX applications where a silica/zircon composition is a better match to the casting process than an all silica composition.