Duramax Ultra-X lasts over 5 times longer than other packing.

Ultra-X is a high performance, non-asbestos, compression packing that is engineered specifically for the marine industry. Its excellent lubricity and high thermal conductivity keeps shafts running cool at all speeds. Unlike flax and other packing materials, once Ultra-X is installed you never need to worry about it again, virtually eliminating maintenance.

What is Duramax Ultra-X High-Performance Packing?

It is a braided hydrophobic fiber packing. A unique, patented manufacturing technology encapsulates graphic particles and impregnates specialized lubricants into its expanded PTFE strands. Unlike competitors’ packing that blends graphite particles between strands during the braiding process.

Benefits of Ultra-X High Performance Packing

  • Stays pliable-will not harden or become brittle
  • Easy to install and remove for repacking
  • Grease-free installation - east to cut, and conforms easily
  • High tensile strength - not consumed in use
  • Self-lubricating - virtually needs no water to lubricate
  • Virtually eliminates maintenance, shaft scoring and replacement

Duramax Ultra-X always runs cool, even at high shaft speeds.

Ultra-X transfers frictional heat to stuffing box, which functions as a heat sink. In contrast, flax packing acts as an insulator, trapping frictional heat that can cause shaft damage and loss of seal.
heat transfer

Available in 18 Standard Sizes.

Ultra-X grouping
  • Duramax Ultra-X comes packed standard on spools of: 1, 3, 5 and 10 pounds.
  • Bulk spools of 25 and 35 pounds are also available.
  • Custom size packing is available upon request.
pdf   Duramax Ultra-X Brochure
pdf3 Ultra-X_ESP
pdf   Duramax Ultra-X Installation
Duramax® is a registered trademark of Duramax Marine® LLC.
Ultra-X® is a registered trademark of Duramax Marine® LLC.

.Duramax Ultra-X meets environmental requirements
Keeps bilge free of contaminants. Virtually needs no water for lubrication, and it doesn’t shrink- practically eliminating stuffing box drip. Helps eliminate overboard pumping of polluted bilge water and contaminates.

.Complete Duramax system for optimum journal life and performance.
  • Johnson Duramax Heavy-Duty Stuffing Box
  • Johnson utless Bearings
  • Ultra-X High-Compression Packing
Ultra-x and Stuffing Box
About Johnson Stuffing Boxes