US-1 dielectric oil is a primary alternative for the recently discontinued ExxonMobil Norpar™ 15.
US-1’s formulation is designed to meet the specifications and performance characteristics of Norpar 15. The advantage of switching to US-1 is that many users have found that it can be mixed with Norpar 15 so that existing Norpar 15 users will not be required to purchase new oil for their operation or require disposal prior to starting up with US-1.