If you struggle with persistent leaks or premature packing failure in low-speed rotating equipment, you’re not alone. Many industries, including pulp and paper, face the same frustration: packings that compress too quickly, lose adjustment, and require maintenance long before scheduled downtime.

That challenge is exactly why we developedStyle 7413 Mechanical Packing — a packing designed not just to survive the harshest operating environments, but to thrive in them.

Below, we’ll break down the story behind 7413, what makes it different, and why so many facilities now rely on it for long-term, dependable sealing performance.

The Challenge: Build a Packing That Lasts 18 Months

Years ago, SealRyt was approached by Andritz, the world’s largest manufacturer of fiberline and pulp mill equipment. They had a problem that no one had been able to solve:

They needed mechanical packing that could reliably last for 18 months.

At the time, the industry benchmark for these applications was one year… on a good day.

In real-world conditions, packings often compressed too quickly, equipment ran out of adjustment, and leaks began well before the next scheduled shutdown.

Andritz wanted a packing that would break the limits - and a company that would stand behind its solution with a warranty.

Challenge accepted.

Why Traditional Packings FailFaster in Fiberline Equipment

Most fiberline rotating equipment — including high-pressure feeders, low-pressure feeders, outlet devices, and top separators— uses large cross-section packings, often around 7/8" or larger.

Larger cross-sections create a unique problem:

More space = more air inside the braid.

That trapped air leads to:

●     Higher compressibility

●     Faster wear

●     More frequent adjustments

●     Premature leaks

Many manufacturers try to fix this by adding fillers or lubricants to occupy the voids, but these materials are softer and less dense than carbon or graphite — which only accelerates the compressibility issue.

The SealRyt team knew the solution wasn’t just better materials… it required a better architecture.

The Breakthrough: A Packing BuiltFrom the Inside Out

To solve the problem, SealRyt rebuilt Style7413 from the ground up focusing on four key areas:

1. Pre-Twisted Yarns (at a Precise Rate)

Every yarn used in 7413 is pre-twisted before weaving. This increases density and stability long before the yarns ever enter the braider.

2. Controlled Tension on Every Yarn

By applying a carefully calibrated series of weights, SealRyt ensures every yarn is pulled under uniform tension — resulting in a tightly packed, consistent braid.

3. A Highly-Dense, Engineered Core

Instead of treating the packing as a single structure, SealRyt broke it down into four quadrants, optimizing density and symmetry within each one.

This quadrant-based approach ensures:

●     Maximum compression resistance

●     Even load distribution

●     Reduced internal movement

●     Dramatically extended service life

4. Proven Materials, Perfectly Arranged

There’s no exotic ingredient list here — just high-quality carbon and graphite, strategically positioned to deliver performance where it matters most.

The magic isn’t what it’s made of.

It’s how it’s made.

The Result: 18 Months… and inMany Cases, 5 Years of Performance

The SealRyt team not only met the 18-month target, we exceeded it. Some facilities using Style 7413 have seen up to five years of continuous service on the same packing set.

Andritz got the packing they needed. The industry got a new standard.

Not Just for Pulp & Paper

While 7413 was born from fiberline challenges, it didn’t take long for other industries to notice.

Today, the packing is widely used in:

●     Chemical processing

●     Mining

●     Power generation

●     Any application with large, slow-rotating equipment

If your operation demands resilience and longevity, Style 7413 delivers.

Why Style 7413 Works So Well

In simple terms: It is incredibly dense, incredibly resilient, and incredibly consistent.

By focusing on the manufacturing process, we created a packing that resists the compression and deformation that plaguetraditional braided packings in large cross-sections.

When you need a packing that won’t let you down, this is the one.

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