ISO viscosity grade

a number indicating the nominal viscosity of an industrial fluid lubricant at 40°C (104°F) as defined by ISO Standard 3448. For example, an unused ISO 68 grade product would be expected to show a viscosity at 40°C of 68 cSt, plus or minus 10% (6.8 cSt). This pattern is maintained throughout the ISO viscosity grading system.

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