477-1

Chesterton 477‑1 is a high-performance carbon fiber packing made with low-modulus filament yarn and inorganic blocking agents to resist gas and liquid penetration. Treated with a molybdenum-based corrosion inhibitor, it offers strong sealing with reduced stem pitting and wear.

Rated for extreme conditions—up to 1,050°F, 3,600 psi in stationary service, and pH 0–13—it provides low friction, fast break-in, and long service life. Ideal for pumps and valves in demanding industrial environments.

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Product Features

✔ Strong, yet pliable, continuous filament carbon yarn
✔ Unique inorganic blocking agent inhibits gas/liquid penetration
✔ Molybdenum-based corrosion inhibitor protects against stem pitting

Technical Data ↓

  • Virtually all pumps and valves against most solvents, gases, and  other liquids

  • Low modulus carbon fiber

  • 3.2 ( 0.125 inch )

  • 25.4 ( 1 )

  • 3600 PSIg ( 250 BARg )

  • 200 PSIg ( 14 BARg )

  • 15 m/s ( 3000 fpm )

  • 1050 °F ( 565 °C )

  • 13 pH

  • Except with strong oxidizers

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