ISO 12152:2012

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Lubricants, industrial oils and related products — Determination of the foaming and air release properties of industrial gear oils using a spur gear test rig — Flender foam test procedure

ISO 12152:2012 is an international standard that outlines a test method to determine the foaming and air release properties of industrial gear oils, specifically using a single-stage spur gear rig to simulate real gearbox conditions; essentially, it provides a standardized way to evaluate how much an industrial gear oil foams under pressure and how quickly it can release trapped air.