This Estonian standard is valid for thermally treated oil shale or its mixtures, where the proportion of oil shale is at least 70 % (hereafter burnt shale or BS). Burnt shale is used as a filler material in plastic. Burnt shale consists of clinker material, free lime, dehydrated calcium sulphate and a mixture of partially caked particles of the previously mentioned components and depending on its fineness is divided into the following product classes:
— Plastic BS – F
— Plastic BS – M
— Plastic BS – C.
The standard establishes the characteristics, required testing methods and a procedure for the evaluation of conformity of burnt shale.