Expandable Pure Graphite Packing

I. Product Core

Expandable Pure Graphite Packing is made from natural flake graphite with a carbon content of ≥99.5% as the raw material, and it is a flexible sealing packing produced through high-temperature expansion (expansion ratio: 200-300 times), compression molding, and precision cutting processes. Its core value lies in leveraging the natural temperature resistance and expansion properties of graphite to achieve "self-compensating sealing" via slight compression and expansion in dynamic sealing scenarios. This addresses the pain points of traditional sealing materials-such as easy leakage and short service life under high/low temperature and high-pressure conditions-and meets the dynamic/static sealing requirements of equipment across multiple industries.

II. Technical Parameters

III. Core Features

Ultra-high Purity & Environmental Friendliness: Free of additives like resin and fibers, it has an ash content of ≤0.5%, sulfur content of ≤300ppm, and chlorine content of ≤50ppm. It complies with food-grade (FDA 21 CFR Part 177.2600) and pharmaceutical-grade sealing standards, with no harmful substances leached, making it suitable for clean working conditions.

Excellent Expansion & Sealing Performance: It has an initial expansion ratio of 200-300 times and can achieve secondary micro-expansion under preheating conditions of 80-120℃. With a compression rate of 35%-50% and a rebound rate of ≥15%, it can automatically compensate for wear on the sealing surface. The medium leakage rate is ≤0.1ml/h (test medium: water; pressure: 10bar).

Extreme Environment Resistance: Its temperature resistance range is -200℃~600℃ (in air atmosphere) and -200℃~3000℃ (in inert atmosphere). It can withstand a maximum static pressure of 30MPa and a dynamic sealing linear speed of ≤15m/s, and is stably compatible with various media such as oil, acid, alkali, and steam (pH 0-14).

Convenient Installation & Adaptability: Regular cross-sectional specifications include square (3mm×3mm~50mm×50mm) and circular (Φ3mm~Φ50mm), with support for custom special cross-sections. No pre-treatment is required-it can be directly filled into the sealing cavity-and it is adaptable to irregular sealing structures of equipment such as pumps, valves, and agitators. Its installation efficiency is 30% higher than that of traditional packing.

Long Service Life & Low Maintenance: Under standard operating conditions, its wear rate is ≤0.1mm/1000h, and its normal service cycle can reach 8000-12000h. Frequent replacement is not needed, significantly reducing equipment downtime and maintenance costs.

 

 

IV. Application Fields

Petrochemical Industry: Expandable Pure Graphite Packing is used for shaft seals and flange seals of crude oil transfer pumps, residual oil heat exchangers, and acid-alkali reactors. It can withstand high-temperature media (≤450℃) and corrosive fluids, preventing medium leakage and pollution.

Power Industry: Suitable for the dynamic sealing of steam turbine condensate pumps in thermal power plants and circulating water pumps in nuclear power plants. It maintains sealing reliability under high-pressure (≤25MPa) and low-temperature (-40℃~150℃) conditions, meeting the long-cycle operation requirements of power equipment.

Food & Pharmaceutical Industry: Used as a sealing material for juice homogenizers and pharmaceutical liquid mixing tanks. It meets cleanliness standards, with no additive migration, avoiding contamination of food or pharmaceutical liquids and complying with GMP production regulations.

New Energy Industry: Applied for sealing lithium battery slurry mixing tanks and hydrogen electrolyzers. It resists electrolyte corrosion and hydrogen environments while meeting low impurity leaching requirements, ensuring the safe operation of new energy equipment.

General Industrial Field: Suitable for roller sealing in printing and dyeing equipment and drying cylinder sealing in paper machines. It maintains stable sealing performance even in hot and humid environments (temperature: 80-120℃; humidity: ≥85%), reducing equipment failures.

V. Supplementary Information

Customized versions-impregnated with PTFE (to enhance wear resistance) or coated with metal mesh (to strengthen structural integrity)-can be provided according to customer needs, adapting to more complex working conditions.

The product has passed ISO 9001 quality management system certification and SGS environmental testing, and we can provide third-party testing reports upon request.

We offer supporting services such as sealing cavity design suggestions and installation guidance to help customers optimize the performance of their sealing systems.

V.Key Optimization Notes

Term Consistency: Unified industrial terms (e.g., "temperature resistance" instead of mixed "temperature tolerance/resistance"; "rebound rate" instead of "rebound ratio") to align with international technical standards.

Grammar & Clarity: Fixed dangling modifiers (e.g., revised "Using... flexible sealing packing is made" to "Made from... this product is a flexible sealing packing") and clarified ambiguous references (e.g., "This product" instead of vague "It") for readability.

Professionalism: Refined expressions like "pharmaceutical liquid mixing tanks" (instead of "liquid medicine mixing tanks") and "impurity leaching" (instead of "impurity precipitation") to match food/pharmaceutical and material science contexts.

Format Uniformity: Standardized chapter numbering (Roman numerals) and table headers (e.g., "Item" instead of "project"; "Specification Range" instead of "Indicator range") to meet English technical document norms.

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