Product Overview
Black PTFE graphite gland packing is a graphite-impregnated PTFE braided packing designed for rotary and static sealing in pumps, valves, agitators, and reactors. Supplied in square cross-sections from 3 mm to 50 mm, this black PTFE graphite gland packing combines the chemical inertness of PTFE with the solid lubricity of graphite.
Unlike packing with abrasive fillers, the graphite dispersion in the PTFE yarn acts as a solid lubricant. The result is a black PTFE graphite gland packing with a low friction coefficient of µ 0.04–0.08, which significantly reduces shaft and sleeve wear in centrifugal pumps, mixers, plunger pumps, and rotary shafts.
Key Benefits of Black PTFE Graphite Gland Packing
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Low friction coefficient, µ 0.04–0.08 — reduces shaft and sleeve wear
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Excellent chemical compatibility — resists almost all media across pH 0–14
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Wide temperature range — from -200 °C to +280 °C (-328 °F to +536 °F)
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No abrasive filler — graphite functions as a solid lubricant
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Long shelf life — no aging or cure date limit; will not harden, oxidize, or degrade in storage
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Flexible supply — standard 3–50 mm square sections; non-standard sizes available
Applications
This black PTFE graphite gland packing is suitable for:
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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 |
| Friction coefficient | µ 0.04 – 0.08 |
| Color | Black |
| Available sizes | 3 mm – 50 mm square; spools or custom-cut lengths |
| Applicable standard | JB/T 6626; equivalent performance to API 622 packing type criteria |
Chemical Compatibility
This black PTFE graphite gland packing resists water, steam, oils, solvents, organic and inorganic acids, and alkalis.
Do not use with:
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Molten alkali metals, such as sodium and potassium
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Fuming nitric acid
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Elemental fluorine
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Strong oxidizing agents
Contact with these media will rapidly destroy the PTFE matrix.
Installation & Maintenance Notes
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Low thermal conductivity
Because black PTFE graphite gland packing 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. -
Cold flow tendency
PTFE cold-flows under sustained gland load. Do not over-tighten the gland follower.
Follow the step-by-step PTFE Packing Installation Guide for torque values and compression limits. -
Shelf life
No aging or cure date limit. The black PTFE graphite gland 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, and composition reports 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, e.g., 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 & Shipping
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Primary packaging: packing wound on a spool, sealed in PE bag
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Secondary packaging: spools placed in corrugated carton; standard net weight 10 kg or 25 kg
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Tertiary packaging: 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
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Lead time: orders under 500 kg: 7–15 working days; FCL: 15–20 working days
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
FAQ
What is black PTFE graphite gland packing used for?
It is a compression packing for sealing rotary and static equipment such as centrifugal pumps, valves, agitators, mixers, and reactors in chemical, food, and marine service.
What is the maximum temperature and pressure for this packing?
Temperature range: -200 °C to +280 °C (-328 °F to +536 °F).
Dynamic pressure: up to 2.0 MPa (20 bar).
Static pressure: up to 5.0 MPa (50 bar).
Is black PTFE graphite gland packing suitable for food applications?
It is used in food processing equipment. Direct food-contact compliance must be verified according to local regulations.
What media should be avoided?
Molten alkali metals, fuming nitric acid, elemental fluorine, and strong oxidizing agents.
How should I install black PTFE graphite gland packing?
Do not over-tighten the gland follower because PTFE cold-flows. Maintain a controlled leak rate of 10–20 drops per minute or use an external flush. Refer to the 聚四氟乙烯填料安装指南》.
What is the MOQ for custom sizes?
Non-standard sizes: 30 kg per size.
Tailor-made specifications: 50 kg.
Custom packaging: 100 kg.
Request a Quote
For reliable, low-friction sealing in demanding chemical and marine applications, choose black PTFE graphite gland packing. Contact our sealing engineers for pricing, technical datasheets, samples, or third-party test reports.
