GOST 9147-1980 Laboratory porcelain ware and apparatus. Specifications*, 2024-04-19 Update
GOST 9736-1991 Electric apparatus of direct transformation for measuring non-electrical values. General technical requirements and methods of tests*, 2024-04-19 Update
ISO 6245:1982 Petroleum products — Determination of ash*, 1982-11-01 Update
GOST 1461-1975 history
2023GOST 1461-2023 Petroleum and petroleum products. Method of ash test
1975GOST 1461-1975 Petroleum and petroleum products. Method of ash test