- Heat transfer
ISO 6743-12 QB
Heat transfer fluids for closed heating circuits, mineral and synthetic oils for duties up to 320–340 °C, in process plant, presses and thermal oil boilers.

ISO 6743-12 QB
ISO 6743-12 QB
ISO 6743-12 QC
ISO 6743-12 QB

DIN 51522
ISO 6743-12 Q
DIN 51522 Q

For other machines, or not specific to one.
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