Nomex® Fiber Packing (Resilient Rubber Core)

At Kriloha Ltd., we recognize that in the real world, shafts aren’t always perfectly straight and bearings aren’t always new. A rigid packing in a vibrating pump is a recipe for a leak. The Kriloha Nomex® Rubber-Core Packing is our engineered answer for “Dynamic Recovery” sealing. As a premier global provider of braided packings, Kriloha Gaskets has mastered the Co-Extrusion Braiding technology required to fuse a high-tension rubber heart with a heat-resistant Nomex® skin.

The engineering of our Rubber-Core series is based on Mechanical Memory. In a standard stuffing box, once the fibers are compressed, they stay compressed. Our internal Silicone or EPDM core provides an “Active Energizer” that pushes the Nomex® jacket outward against the shaft and the stuffing box wall. At Kriloha, we ensure the rubber core is sized precisely to the cross-section of the braid, providing a uniform “360-degree” seal that adapts to every vibration.

Manufacturing this packing at Kriloha involves strict Compression-Set Testing. We ensure the rubber core won’t “heat-set” or lose its elasticity at the operating temperature of the Nomex® jacket. Whether you are sealing a high-vibration mixer or an aging centrifugal pump, Kriloha Nomex® Rubber-Core Packing provides the mechanical agility and thermal stamina your facility demands. By choosing Kriloha Ltd., you are investing in a “Self-Adjusting” technology that reduces the need for frequent gland tightening.

Primary Use Cases

Worn Centrifugal Pumps: The premier choice for older pumps where shaft “wobble” or slight misalignment makes it difficult to maintain a seal with standard packings.
Large-Diameter Agitators & Mixers: Handling significant shaft “run-out” in chemical processing tanks where the seal must “breathe” with the mechanical movement.
Reciprocating Slurry Pumps: Providing a resilient, shock-absorbing seal for abrasive fluids in municipal wastewater and mining.
Boiler Feed & Condensate Pumps: Maintaining a constant seal in high-vibration thermal systems where pressure surges are frequent.
Paper & Pulp Refiners: Resisting the mechanical stresses of wood pulp processing while providing enough elasticity to handle high-speed rotations.

FAQs

What is the benefit of the Rubber Core over a solid Nomex® packing?

The rubber core allows the packing to recover its shape. If the shaft moves or vibrates, the rubber pushes the packing back into contact with the shaft immediately. A solid packing often stays “crushed,” creating a gap where fluid can leak through.

Does the rubber core melt at high temperatures?

Kriloha uses high-temperature Silicone or EPDM cores that are rated to match the thermal limits of the Nomex® jacket (approx. 250°C–280°C). However, for applications exceeding 300°C, we recommend our Graphite series.

Will this packing score my shaft?

No. Nomex® is a relatively soft aramid fiber, and because the rubber core allows the seal to be maintained at lower gland pressures, there is actually less friction and less wear on your shaft or sleeve.

How do I cut this packing for installation?

Use a very sharp blade to ensure a clean cut through both the Nomex® jacket and the rubber core. A 45-degree miter cut is recommended. It is vital that the ends of the rubber core meet flush to prevent a leak path.

How many rings should I install?

A standard setup usually requires 5 to 7 rings. Because this packing is so resilient, you will find it requires much less adjustment during the initial “break-in” period than a standard fiber packing.