Braided packing made from PTFE yarn with graphite dispersion. Designed for rotary and static sealing in pumps, valves, agitators, and reactors. Supplied in square cross-section from 3 mm to 50 mm.
Applications
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Centrifugal pumps
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Mixers and agitators
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Reciprocating plunger pumps
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Valves and expansion joints
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Rotary shafts in chemical, food, and marine service
Technical Specifications
| Parameter | Value |
|---|---|
| Material grade | PTFE yarn, graphite-impregnated |
| Braid structure | Square braid with corner construction; diagonal/interlock braid available on request |
| Temperature range | -200 ℃ to +280 ℃ (-328 ℉ to +536 ℉) |
| Pressure – dynamic | 2.0 MPa (20 bar) |
| Pressure – static | 5.0 MPa (50 bar) |
| pH range | 0 – 14 |
| Max linear speed | Rotary: ≤10 m/s; reciprocating: ≤2 m/s |
| Density | 1.55 ±0.10 g/cm³ |
| Suitable media | Water, steam, oils, solvents, organic/inorganic acids, alkalis — except strong oxidizers |
| Forbidden media | Molten alkali metals (sodium, potassium), fuming nitric acid, elemental fluorine, strong oxidizing agents |
| Available sizes | 3 mm – 50 mm square; spools or custom-cut lengths |
| Color | Black |
| Applicable standard | JB/T 6626; equivalent performance to API 622 packing type criteria |
Key Performance Notes
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Low friction coefficient (µ 0.04–0.08). Reduces shaft/sleeve wear. No abrasive filler; graphite functions as solid lubricant.
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Chemical compatibility. Resists almost all media across pH 0–14. Three critical exceptions: molten alkali metals, fuming nitric acid, and elemental fluorine — contact will rapidly destroy the PTFE matrix.
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Low thermal conductivity. The material conducts heat poorly. A controlled leak rate of 10–20 drops per minute, or an external flush, is required to carry friction heat away from the stuffing box.
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Cold flow tendency. PTFE cold-flows under sustained gland load. Gland follower must not be over-tightened. Follow the step-by-step <a href=”/installation-guide”>PTFE Packing Installation Guide (PDF)</a> for torque values and compression limits.
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Shelf life. No aging or cure date limit. PTFE/graphite packing does not harden, oxidize, or degrade during storage.
Certifications & Compliance
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ISO 9001:2015 – Quality management system, certified by Beijing United Intelligence Certification Co., Ltd..
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RoHS 2011/65/EU – Lead, mercury, cadmium, Cr(VI), PBBs, PBDEs below threshold limits.
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Third-party test reports (friction, chemical resistance, composition) – available on request.
Customization & Private Label (OEM/ODM)
| Custom option | MOQ | Sample lead time | Sample cost |
|---|---|---|---|
| Non-standard size (e.g., 5.8 mm, 12.7 mm) | 30 kg per size | 3–10 working days | Charged; refunded with first mass order |
| Tailor-made specification (density, graphite content) | 50 kg | 5–15 working days | Charged |
| Custom packaging (private-label spool, box) | 100 kg | 3 working days for layout approval | No extra tooling charge |
Packaging & Container Loading
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Primary: Packing wound on a spool, sealed in PE bag.
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Secondary: Spools placed in corrugated carton. Standard carton weight: 10 kg or 25 kg net.
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Tertiary: Cartons strapped on fumigated ISPM 15 heat-treated wooden pallet.
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Pallet dimensions: 1100×1100 mm or 1200×1000 mm as required.
Quality Control
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Incoming PTFE yarn inspection (linear density, graphite content, twist).
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In-line braiding density monitoring with automatic optical checks.
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Batch traceability: every spool carries a unique lot number linked to raw material, production date, and in-process data.
Lead Time & Shipping
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Orders under 500 kg: 7–15 working days after order confirmation.
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Full container loads (FCL): lead time confirmed upon PO review; typical 15–20 working days.
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Trade term: FOB Shanghai (Incoterms 2020). EXW, CIF available on request.
