I. Core Product Positioning
The Graphite Sealing Cylinder Gasket is a core component centered around the sealing requirements of internal combustion engines, utilizing high-purity graphite as the key sealing material. It is designed for the complex working conditions of engines under high temperature and high pressure. Leveraging the excellent sealing and temperature resistance properties of graphite, it achieves complete isolation of combustion chamber gases, engine oil, and coolant, eliminating blow-by issues. This provides core support for stable power output, efficient operation, and longevity of engines, and is suitable for various types of engines such as fuel-powered and hybrid engines.
II. Core Features
1.Excellent Sealing and Temperature Resistance
High-density graphite with a purity of ≥99.5% is used as the sealing layer, paired with a low-carbon steel/304 stainless steel support layer. The graphite layer can closely fit the microscopic gaps of the sealing surface, maintaining sealing integrity under instantaneous high temperatures of 1800℃ and peak pressures of 25MPa. The blow-by rate is reduced by more than 65% compared to ordinary material cylinder gaskets, and it can withstand a long-term temperature range of -40℃ to 400℃ without performance degradation.
2.Strong Corrosion Resistance and Medium Resistance
Graphite itself has strong chemical stability. After special treatment, it can withstand long-term erosion from engine oil, ethylene glycol coolant, fuel, and combustion exhaust gas, without swelling or aging after immersion. At the same time, it is resistant to ultraviolet rays and ozone, and its sealing performance degradation rate is less than 3% under complex working conditions.
3.High Adaptive Compensation Capability
The graphite sealing layer has a compression rate of 18% to 22% and a rebound rate of ≥88%. It can automatically compensate for minor deformations of the cylinder block/head caused by temperature changes, as well as unevenness within 0.12mm of the sealing surface during installation. Reliable sealing can be achieved without the need for additional sealant, reducing assembly difficulty.
4.High Precision and Durability
Utilizing CNC laser cutting and precision stamping processes, the dimensional tolerance is controlled within ±0.015mm, ensuring a 100% match between the positioning holes and the engine. The graphite layer and support layer are integrally formed through high-temperature molding, eliminating the risk of delamination. After testing, the engine maintains a sealing pressure retention rate of ≥92% even after 12,000 consecutive starts and stops and 6,000 cumulative operating hours, extending the service life by 90% compared to traditional gaskets.
5.Environmental Protection and Ease of Installation
Graphite material meets RoHS and REACH environmental standards, with no harmful substances released. The edges of the sealing surface are rounded to prevent scratching the cylinder during installation, which can improve assembly efficiency by 30% and reduce manual operation errors.
III. Scope of Application
Application Scenario
Widely applicable to equipment equipped with internal combustion engines, such as passenger vehicles (mid-to-high-end sedans, high-performance SUVs, sports cars), commercial vehicles (heavy-duty trucks, long-distance buses, cold chain logistics vehicles), construction machinery (large excavators, mining loaders, crawler cranes), marine power (ocean-going cargo ships, offshore patrol vessels), generator sets (high-power diesel generators, gas generator sets), and special vehicles (emergency engineering vehicles, military off-road vehicles).
Compatible Engine Types
It is compatible with gasoline and diesel engines that adopt natural aspiration, turbocharging, supercharging, and other intake methods, especially high-end engines with high compression ratio (≥13:1) and high power density (≥40kW/L). It can meet the sealing requirements under harsh working conditions.
IV. Technical Parameters
|
Parameter Category |
Detailed Explanation |
|
Core Material |
Sealing layer: high-density flexible graphite (purity ≥99.5%); Supporting layer: Q235 low-carbon steel / 304 stainless steel |
|
Temperature Adaptation Range |
Long-term operating temperature: -40℃~400℃; instantaneous withstand temperature: ≤1800℃ (duration ≤10s) |
|
Sealing Pressure |
Peak pressure in combustion chamber area: ≥25MPa; sealing pressure of oil passage: ≥5MPa; sealing pressure of coolant passage: ≥3MPa |
|
Size Specifications |
Compatible cylinder diameter: 50mm~160mm (customizable); thickness: 1.0mm~3.2mm (standard specifications: 1.2mm, 1.5mm, 2.0mm, 2.5mm) |
|
Surface Treatment |
The surface of the support layer is galvanized (with a zinc layer thickness of 10μm~15μm) or sprayed with plastic (with a coating thickness of 18μm~22μm), achieving a rust-proof grade that ensures no rusting after 72 hours of salt spray testing |
|
Implementation Standard |
Complies with ISO 9001 quality management system, SAE J200 standard, GB/T 27696-2011 "Technical Conditions for Cylinder Gasket of Internal Combustion Engine", and international environmental protection standards for graphite products |
|
Quality Inspection |
Each batch undergoes 100% helium mass spectrum leak detection (leak rate ≤1×10⁻¹⁰ Pa・m³/s), dimensional inspection, and hardness testing (support layer hardness: HB 185~225) |
|
Shelf Life |
In its original packaging, stored at room temperature (0℃~30℃) and in a dry environment (relative humidity ≤60%), it has a shelf life of 36 months |
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