GOST 2409-1980 Refractory materials and articles. Method of water absorption, bulk density, apparent and true porosities determination*, 1980-12-22 Update
GOST 2642.0-1986 Refractories and refractory raw materials. General requiremetns for methods of analysis*, 1986-12-22 Update
GOST 2642.1-1986 Refractories and refractory raw materials. Method for the determination of hygroscopic moisture*, 1986-12-22 Update
GOST 2642.2-1986 Refractories and refractory raw materials. Methods for the determination of mass change ignition*, 1986-12-22 Update