Product Overview
What is Graphite-PTFE Hybrid Packing?
Graphite PTFE hybrid packing is a braided gland packing that integrates expanded graphite lubrication with PTFE matrix or PTFE-coated yarns. The hybrid design delivers a balance of excellent chemical compatibility (from PTFE), reduced friction and shaft protection (from graphite), plus improved high-temperature performance compared with PTFE-only packings. It is engineered for demanding pump, valve and rotating shaft applications where both chemical resistance and thermal stability are important.
Typical Constructions
-
PTFE yarn core with graphite impregnation — excellent chemical resistance + lubricity.
-
Graphite-coated PTFE braid — improved temperature endurance and lubrication film.
-
Multi-strand PTFE/graphite blend yarn braid — balanced mechanical strength and low friction.
-
Reinforced core options (aramid/nylon core + PTFE/graphite wrap) — for higher pressure/abrasion environments.
Key Features & Buyer Benefits
-
Low friction & reduced shaft wear — graphite film reduces running friction; PTFE prevents chemical attack.
-
Extended temperature window — typical operating up to ~300°C (grade dependent) with short excursions higher in non-oxidizing atmospheres.
-
Broad chemical compatibility — strong resistance to hydrocarbons, solvents and many acids/alkalis (check datasheet for oxidizers).
-
Low leakage & tight sealing — suitable for vacuum, high pressure and steam applications when installed correctly.
-
Available forms — pre-formed valve rings, full spools (cut-to-length), pump kits and OEM packaging.
-
Electrical behavior — depending on graphite loading, offers partial conductivity for static dissipation where required.
Applications
Applications-
Centrifugal, rotary and gear pumps handling hot oil, steam, hydrocarbons and chemicals.
-
Gate, globe, ball and check valve stems (pre-formed ring sets).
-
Thermal fluid circulation pumps and hot oil systems.
-
Refinery, petrochemical and chemical processing plants.
-
High-temperature process equipment, mixers and agitators.
-
Vacuum and low-outgassing applications (special low-ash grades).
Technical Specifications (typical / conservative values)
Values vary by formulation. Always request the material datasheet for the specific grade you plan to buy.
-
Base materials: PTFE matrix + expanded natural graphite / graphite impregnation; optional reinforcement (aramid/nylon).
-
Construction: Square braid (8-strand or 12-strand) or multi-ply braid.
-
Recommended continuous temperature range: −200°C to +260°C for PTFE-dominant grades; −200°C to ~300°C for graphite-enhanced grades (some grades tolerate short excursions to ~350°C in non-oxidizing atmospheres).
-
Maximum recommended pressure: up to 15 MPa (150 bar) depending on gland design and reinforcement.
-
Maximum shaft speed: up to 15 m/s (application dependent).
-
pH compatibility: approx. 0–14 for many hybrid grades; avoid concentrated oxidizers without testing.
-
Electrical conductivity: low to moderate (depends on % graphite).
-
Standard spool lengths: 5 m, 10 m, 20 m (custom lengths available).
-
Pre-formed valve ring sets: Standard 3-ring sets by stem diameter.
-
Testing & certification: ISO 9001 production; MSDS, batch test reports and leakage/run test data available on request.
Common Sizes (industry standard / real-world)
Square cross-section sizes (metric / imperial):
-
3.0 mm (≈1/8″)
-
4.0 mm (≈5/32″)
-
5.0 mm (≈3/16″)
-
6.0 mm (≈1/4″)
-
8.0 mm (≈5/16″)
-
10.0 mm (≈3/8″)
-
12.0 mm (≈1/2″)
Valve pre-formed ring set examples (typical):
-
1/4″ stem → 3 rings × 3.0 mm
-
1/2″ stem → 3 rings × 6.0 mm
-
3/4″ stem → 3 rings × 8.0 mm
-
1″ stem → 3 rings × 10.0 mm
Advantages — Why Choose Graphite-PTFE Hybrid Packing
-
Balanced performance: Combines PTFE chemical resistance with graphite’s lubrication and heat tolerance.
-
Lower lifecycle cost: Longer runtime and reduced shaft replacement vs poorer performing packings.
-
Versatile: Works in steam, hot oils, hydrocarbons and many chemical services.
-
Low friction: Reduces operating temperature and energy loss.
-
Easy retrofit: Direct replacement for PTFE or graphite packings in many pumps/valves.
-
Customizable: Impregnation level, core material and spool format tailored to job specs.
Comparison: Graphite-PTFE Hybrid vs Other Packings
| Property / Material | Graphite-PTFE Hybrid | Pure PTFE Packing | Pure Graphite Packing | Aramid (Kevlar®) Packing |
|---|---|---|---|---|
| Temperature capability | High (~260–300°C) | Moderate (~260°C) | Very high (up to ~550°C, non-oxidizing) | Moderate (~250°C) |
| Chemical resistance | Excellent | Excellent | Good (watch oxidizers) | Good (hydrocarbons) |
| Shaft wear | Low | Very low | Low | Low–medium |
| Abrasion resistance | Medium | Low | Medium | High |
| Leakage control | Very good | Good | Very good | Good |
| Conductivity | Low–moderate | Non-conductive | Conductive | Non-conductive |
| Best for | Mixed chemical + high temp duties | Highly corrosive chemistries | Extreme temp / steam | Abrasion / high mechanical stress |
Selection tip: Choose Graphite-PTFE Hybrid when you need both chemical compatibility (PTFE) and high-temp/low-friction lubrication (graphite). For ultra-high temp in inert atmospheres choose pure graphite; for extreme chemical corrosives choose PTFE-dominant grades.
Installation & Best Practices
-
Inspect shaft/stem for scoring; recommended surface finish Ra ≤ 0.8 µm.
-
Install as full sets (do not mix old/new or different materials).
-
Initial gland compression: snug but not over-tight — run and then re-tighten progressively to control leakage.
-
For steam/hot oil: allow controlled run-in leakage and re-adjust after 1–2 hours of operation.
-
Use lantern rings or flush ports where necessary for cooling and contamination removal.
-
For vacuum service, request low-ash/low-outgassing grade.
FAQ
Q: What is the minimum order quantity (MOQ)?
A: Typical MOQ is 30–100 kg per SKU. We accept smaller sample/trial orders — contact sales with size/grade.
Q: What is your lead time?
A: Stock items: 3–7 business days. Custom or pre-formed kits: 7–21 business days depending on volume.
Q: Do you provide samples and test reports?
A: Yes — sample coils or pre-formed valve kits available (buyer covers courier). Material certificates, MSDS and test data are provided on request.
Q: Can you supply pre-formed valve rings and pump packing kits?
A: Yes — we offer pre-formed valve ring sets, pump kits, and OEM labeling/packaging.
Q: Is this suitable for steam service?
A: Many graphite-PTFE hybrid grades are suitable for steam up to the specified temperature limit; request grade specific datasheet for exact service temperature and recommended gland setup.
Q: Can you customize impregnation, core and packaging?
A: Yes — graphite loading, PTFE ratio, core reinforcement, spool length and packaging can be customized. Provide operating temperature, media, pressure and shaft speed for best match.
Q: How should the packing be installed to minimize shaft wear?
A: Use correct gland follower, maintain even compression, prefer PTFE-dominant grades or graphite film for polished shafts, and avoid over-tightening.
Q: What about export & shipping documentation?
A: We provide COO, commercial invoice, packing list, MSDS and test certificates. Custom documents (COA, third-party reports) available on request.
Q: Payment terms?
A: T/T, L/C at sight, PayPal for small orders. Negotiable terms for larger or repeat business.
