Here's some information from a Polish university about the casting technology used in Poland for the production of T-72M1 turrets.
This information is available because of the efforts of Jarosław Wolski, known online as "Militarysta". We've had several long discussions about the composition and physical properties of the "Kvartz" filler inside the turrets of T-72A and T-72M1 tanks and the method of constructing the turrets (it was mostly him educating me). We know that the composite filler of the T-72A/M1 turret is embedded inside the turret cheek cavities during the casting process of the turret itself, and that the "Kvartz" filler is a sintered ceramic block that acts as a casting insert during this casting process. We know that the "Kvartz" blocks are made by sintering quartz sand with several additives at a temperature of 1,200°C at high pressure, but without knowing the ingredients of the compound, accurate estimations of its physical properties were not possible. Until this information becomes publicly available, this document will remain one of the best sources.
Original document obtained and photographed by Piotr Zbies, an engineer. Translations by Jarosław:
- Second Column (grain matrix), last row
- Third Column (binding material), last row
- Fourth Column (additives), last row
"grafit lub mielone elektrody 3÷10" = graphite or ground electrodes 3÷10
"woda do uzyskania wymaganej zawartości wilgoci" = water to obtain the required moisture content
- Fifth Column (moisture content in % of mass), last row
How closely this corresponds to other T-72M1 and T-72A turrets is hard to determine. I'd say that it depends on how much technology transfer occurred when Poland bought the licence for the T-72M1 and if they had to make significant modifications to adjust the technology to suit their manufacturing capabilities.