All new products
MIL-PRF-5606HMineral oil based "super clean" hydraulic fluid for use with brake and hydraulic systems with synthetic rubber seals. Meets specifications MIL-PRF-5606H. Colored red.
Skydrol LD-4 was also introduced in 1978, and is today the largest selling aviation phosphate ester fluid in the world.
The Skydrol 500 series of fluids has the longest service history among phosphate ester products. The first version, Skydrol 500, was introduced in 1952.