GOST

GOST began as the all-union state standard and survived the union as an interstate one: standards adopted through the CIS-region interstate standardisation council apply across member states, forming a shared technical layer — the region's own harmonisation machinery — while each state also issues national standards (GOST R in Russia, ST RK in Kazakhstan) for its own needs. The corpus covers materials, products, test methods and documentation rules, and remains deeply embedded in the region's specifications, procurement and manufacturing.

Their legal status has inverted over time: once mandatory by default, GOST standards are now generally voluntary, becoming binding through the modern mechanisms — listing under technical regulations, incorporation into law, or citation in contracts. Old instincts die harder than old rules, and the assumption that "it's a GOST, therefore mandatory" persists a generation after it stopped being true.

For international projects the recurring work is equivalence: GOST materials against ASTM or EN grades, GOST test methods against ISO ones. Equivalence tables exist and are approximations; the grades are cousins, not twins, and pressure-boundary and structural applications deserve the comparison at property level, not table level.