prEN IEC 61039:2023

This International Standard establishes the detailed classification of the N family (insulating liquids) that belongs to class L (lubricants, industrial oils and related products) in accordance with ISO 8681 and ISO 6743-99, affecting product categories that include products derived from petroleum processing, synthetic chemical products and synthetic and natural esters.
This standard applies to unused liquids. For liquids in service, additional testing may be required to ensure compliance with this standard.