This product is a viscous assembly lubricant for components and equipment designed to use Skydrol aviation hydraulic fluids. Approved by airframe manufacturers, MCS 352B lubricates seals during assembly, preventing them from being damaged. It introduces no foreign material into the hydraulic system because it contains no silicone oils, nor any petroleum based products.Industry Approvals Boeing BAC-5001-6, BAC5506 Douglas DACO-DPM5073