Graphite Packing Reinforced With Inconel Wire

1. Product Core

Graphite Packing Reinforced with Inconel Wire is a high-performance composite sealing product. It uses high-purity expanded graphite (with a carbon content of ≥ 99.5%) as the substrate, and Inconel Wire (mainstream grades: Inconel 625/825) is uniformly embedded through multi-axis weaving and high-temperature curing processes. Its core value lies in integrating the excellent corrosion resistance, temperature resistance, and sealing performance of graphite with the high strength, creep resistance, and high-temperature oxidation resistance of Inconel Wire. This solves the pain points of traditional graphite packing-such as being prone to deformation, having a short lifespan, and poor impact resistance-under the extreme working conditions of "high temperature, high pressure, and strong corrosion", and provides long-term and reliable sealing solutions for key industrial equipment.

2. Technical Parameters

3. Core Features

(1) Superb Mechanical Strength and Creep Resistance

In Graphite Packing reinforced with Inconel wire, Inconel Wire (with a diameter of 0.15~0.3mm) is uniformly distributed at a volume fraction of 15%~25%, which increases the tensile strength of the packing to ≥ 18MPa (80% higher than that of pure graphite packing) and reduces the creep rate to ≤ 0.5%/1000 hours (under the condition of 200℃/15MPa). It can maintain structural stability in long-term high-temperature and high-pressure environments, avoiding sealing failure caused by plastic deformation.

(2) Wide-Range Temperature Resistance and Oxidation Resistance

Temperature resistance in air atmosphere: -200℃~800℃ (the oxidation-resistant coating of Inconel Wire can inhibit high-temperature oxidation);

Temperature resistance in inert atmosphere (nitrogen/argon): -200℃~1200℃, which far exceeds the temperature limit of pure graphite packing (≤ 600℃ in air atmosphere). It is suitable for high-temperature scenarios such as supercritical boilers and aircraft engine auxiliary systems.

(3) Excellent Sealing Performance and Corrosion Resistance

Compression rate: 30%~45%, rebound rate: ≥ 18%, dynamic sealing leakage rate: ≤ 0.05 milliliters/hour (test medium: saturated steam at 150℃, pressure: 20 bar);

The graphite substrate is resistant to corrosion from full-spectrum acids and alkalis (pH 0-14), organic solvents, and molten salts. Inconel Wire is resistant to chloride ion and sulfide corrosion (e.g., high-salt media in offshore oil and gas platforms), with no risk of material brittleness.

(4) Low Friction Coefficient and Long Service Life

The surface of the packing is treated with a polytetrafluoroethylene (PTFE) micro-coating, which reduces the friction coefficient to 0.12~0.15 under dry friction conditions, and the wear rate of the shaft sleeve is ≤ 0.02 mm/1000 hours. Under normal operating conditions, its service life can reach 12,000–18,000 hours, which is more than 50% longer than that of traditional graphite packing, reducing the number of equipment shutdowns and maintenance work.

(5) Strong Engineering Adaptability

Conventional cross-sectional specifications: Square (3mm×3mm~50mm×50mm), Circular (Φ3mm~Φ50mm); customized irregular cross-sections (trapezoidal, wedge-shaped) are supported;

The volume fraction of Inconel Wire can be adjusted according to working conditions (up to 30%) to adapt to sealed chambers of different pressure levels (e.g., low-pressure valves, high-pressure reactors).

 

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4. Application Fields

(1) Power Industry (Core Scenario)

Thermal power: Shaft sealing of supercritical boiler feedwater pumps, flange sealing of turbine condensers-it can withstand high-temperature and high-pressure steam at 540℃/30MPa. The creep resistance of Inconel Wire prevents the packing from long-term compression deformation, and its service life covers one major overhaul cycle of the boiler (about 18 months);

Nuclear power: Sealing of auxiliary pumps in nuclear island cooling systems (e.g., safety injection pumps)-Inconel 625 Wire is radiation-resistant (γ-ray dose ≤ 10⁷ Gy), and graphite is resistant to corrosion in boric acid solution. It meets the RCC-M nuclear-grade material standard and ensures sealing reliability under nuclear safety conditions.

(2) Petrochemical and Oil & Gas Extraction

Chemical industry: Shaft sealing of agitators in high-temperature acid-alkali reactors (e.g., acetic acid synthesis reactors)-it is resistant to corrosion from acetic acid vapor at 280℃/12MPa, and the leakage rate is controlled below 0.03 milliliters/hour to avoid pollution from toxic medium leakage;

Offshore oil and gas: Valve sealing of subsea Christmas trees-inconel 825 Wire is resistant to seawater chloride ion corrosion (no pitting corrosion after soaking in 50℃ seawater for 1000 hours), and graphite is resistant to erosion by crude oil and natural gas, making it suitable for deep-sea high-pressure environments (≤ 40MPa).

(3) Aerospace and High-End Manufacturing

Aviation: Sealing of aircraft engine fuel pumps-it can withstand temperature fluctuations of -50℃~650℃. Inconel Wire is resistant to vibration fatigue (no wire breakage under 1000 Hz vibration), ensuring stable operation of the engine under high-altitude conditions;

Metallurgy: Sealing of flue valves in non-ferrous metal smelting furnaces (e.g., copper smelting converters)-it can withstand 800℃ high-temperature flue gas and splashing molten metal, and the packing has a tear resistance of ≥ 22MPa, avoiding sealing failure at high temperatures and preventing flue gas overflow.

(4) General Industry and Special Fields

Pharmaceutical industry: Door sealing of high-temperature sterilization pots-the graphite substrate meets the FDA 21 CFR Part 177.2600 food-grade standard, with no additive precipitation, and is compatible with GMP clean production requirements;

Shipping industry: Sealing of seawater cooling pumps for ship main engines-inconel Wire is resistant to seawater corrosion, and graphite is resistant to seawater biological adhesion. Its service life exceeds 20,000 hours, reducing maintenance needs during long-distance ship voyages.

5. Supplementary Explanation

(1) Customized Service

We provide customized versions of special-grade Inconel Wire (e.g., Inconel 718, whose creep resistance temperature is increased to 850℃) and high-purity graphite (99.9% purity). We support precision machining with a cross-sectional dimensional tolerance of ± 0.05 mm, making the product suitable for micro-sealing chambers (e.g., aerospace equipment).

(2) Quality Certification

The product has passed ISO 9001 Quality Management System Certification, ASME B16.20 Sealing Standard Certification, and SGS RoHS 2.0 Environmental Testing. Nuclear-grade models have passed RCC-M and ASME BPVC III certifications. We can provide comprehensive third-party testing reports.

(3) Installation and Maintenance

During installation, it is recommended to use a specialized packing cutting tool (to avoid Inconel Wire breakage), and the clearance between the sealing chamber and the shaft sleeve should be controlled at 0.1–0.3 mm;

If slight leakage occurs after long-term use, the sealing performance can be restored by appropriately tightening the gland (torque increment ≤ 5 N·m), without the need for overall replacement.

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