Pure Graphite-PTFE Packing

Pure Graphite-PTFE Packing

Core Features

  • Homogeneous GFO-Style Yarn: Braided from a high-performance yarn where high-purity Graphite is encapsulated within an Expanded PTFE (ePTFE) matrix at the molecular level. Unlike surface-coated packings, the graphite is an integral part of the fiber and will not “wash out” or migrate during service.
  • Superior Thermal Management: The integrated graphite allows the packing to dissipate frictional heat 3 to 5 times faster than pure white PTFE. This prevents “shaft glazing” and thermal expansion issues, even at high peripheral speeds.
  • Self-Lubricating Surface: Features a naturally low coefficient of friction. The expanded PTFE provides the “slickness” needed for smooth rotation, while the graphite acts as a permanent internal dry lubricant.
  • Universal Chemical Immunity: Chemically inert across the almost entire 0–14 pH range. It is resistant to aggressive acids, alkalis, solvents, and corrosive liquors (excluding strong oxidizers like fuming nitric acid).
  • High-Speed Efficiency: Engineered to run significantly cooler than standard synthetic fibers, allowing for shaft speeds up to 25 m/s without the risk of burning or hardening.
  • Excellent Dimensional Stability: The expanded fiber structure is highly compressible and conformable, filling microscopic surface irregularities in the stuffing box while resisting “cold flow” and extrusion.

At Kriloha Ltd., we recognize that in high-velocity rotating equipment, “Heat” is the ultimate predator. A packing that retains heat will eventually destroy both itself and the shaft it is meant to protect. The Kriloha Pure Graphite-PTFE Packing is our engineered answer for “Cool-Running” performance. As a premier global provider of industrial seals, Kriloha Gaskets has mastered the Multi-Lock Braid technology required to turn graphite-integrated ePTFE into a high-performance thermal barrier.

The engineering of our Pure Graphite-PTFE series is based on Internal Heat Transfer. By locking the graphite inside the expanded PTFE fibers, we create a “Thermal Highway.” As the shaft spins, the heat is pulled away from the contact surface and dissipated through the packing rings. At Kriloha, we utilize a specialized Silicone-Free break-in lubricant in our yarns to ensure a safe, cool startup without contaminating sensitive process fluids.

Manufacturing this packing at Kriloha involves strict Fiber-Density Verification. We ensure the braid is dense enough to prevent leakage but flexible enough to conform to slightly worn or out-of-round shafts. Whether you are sealing a high-speed chemical transfer pump or a large-scale wastewater mixer, Kriloha Pure Graphite-PTFE Packing provides the mechanical invincibility and thermal stamina your facility demands. By choosing Kriloha Ltd., you are investing in a “High-Velocity” technology that significantly extends your Mean Time Between Failures (MTBF).

Primary Use Cases

  • High-Speed Centrifugal Pumps: The “gold standard” for pumps handling chemicals, wastewater, and cooling water where heat dissipation is the primary concern.
  • Chemical Agitators & Mixers: Providing a long-life, low-maintenance seal for large-diameter shafts in the chemical and pharmaceutical industries.
  • Paper & Pulp Refiners: Handling “white liquor,” “black liquor,” and stock lines where thermal stability and chemical resistance are mandatory.
  • Condensate & Boiler Feed Pumps: Capable of handling hot water and steam cycles without the hardening or brittleness associated with inferior fibers.
  • General Industrial Maintenance: Often used as a “Universal Service” packing to reduce inventory, as it can effectively replace multiple specialized packings across a plant.
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FAQs

What is the difference between this and “GFO” packing?

“GFO” is a specific brand of yarn. Kriloha’s Pure Graphite-PTFE uses the same engineering principle: graphite is integrated into the expanded PTFE fiber rather than just coated on the outside. This ensures the lubricant stays for the life of the packing.

Is this packing “Shaft-Friendly”?

Absolutely. It is one of the most hardware-friendly packings available. It can be used on 316 Stainless Steel shafts without the need for expensive hardened sleeves or chrome plating.

Can I use this for concentrated Nitric Acid?

It is resistant down to pH 0. However, for highly concentrated oxidizing acids (above 90% concentration), the graphite component may react. In those rare cases, Kriloha recommends our Pure White PTFE filament packing.

Does it require a large “leak-off” for cooling?

Because of its superior thermal conductivity, this packing requires much less cooling water than standard packings. A slow, steady drip (approx. 8–10 drops per minute) is usually sufficient to maintain a cool seal.

How do I install Graphite-PTFE Packing?

Cut the packing into rings with a 45° miter joint. Stagger the joints by 90°. During startup, tighten the gland nuts finger-tight. As the pump reaches operating speed, adjust slowly until the desired leak rate is achieved.

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