MECNME Expanded Graphite Jointing Gaskets

MECNME premium expanded graphite jointing gaskets are high‑performance sheet‑based sealing components, manufactured from high‑purity exfoliated graphite material. The standard product grade adopts 98% pure exfoliated graphite as the core raw material, delivering stable sealing performance across diverse general‑industry working conditions. For extremely demanding working environments such as nuclear‑related facilities, MECNME provides an upgraded variant produced from 99.8% high‑purity graphite. This high‑purity formulation minimizes impurity content, reduces the risk of medium contamination, restricts the release of trace harmful substances, and fully meets the strict material qualification requirements of the nuclear industry for sealing gaskets.

MECNME graphite jointing gaskets stand out among non‑metallic sheet gaskets mainly for their extremely broad applicable temperature window, one of the most prominent product advantages. The material retains stable physical and chemical properties under ultra‑low‑temperature cryogenic conditions, and can also sustain long‑term service under high‑temperature thermal exposure. Such wide temperature adaptability enables the gaskets to cope with frequent temperature swings, thermal shock and alternating hot‑cold cycles that frequently occur in real‑world plant operations. Unlike many polymer‑based gasket materials that will age, harden or lose resilience under extreme temperatures, MECNME graphite jointing gaskets maintain basic compressibility and sealing integrity without rapid performance degradation.

Handling and processing convenience represents another practical merit of MECNME graphite jointing gaskets. The sheet‑form structure allows customers to easily cut and fabricate gaskets into custom shapes on‑site according to flange outlines. Simple hand‑cutting or mechanical die‑cutting processes are feasible for small‑and‑medium‑size pieces, bringing great flexibility for maintenance work and emergency on‑site gasket replacement. It is worth noting that large‑dimension cut gaskets possess relatively low structural rigidity. Without auxiliary support during transportation, lifting and installation, deformation, bending or local cracking may take place. Therefore adequate supporting measures shall be adopted for large‑size gaskets in carriage and fitting procedures to avoid mechanical damage and guarantee final assembly quality.

Technical Specifications of MECNME Graphite Jointing Gaskets

• Density: 0.7‑1.0 g/cm³. Adjusted density balances compressibility and structural stability, preventing excessive creep while reserving sufficient deformation capacity to fill flange surface micro‑defects.
• Compressibility (tested per ASTM F36A): 30%. Under proper bolt pre‑load, the gasket can deform adequately to conform to minor irregularities of flange sealing faces.
• Recovery (tested per ASTM F36A): ≥ 10%. Certain elastic recovery capacity is reserved after compression, helping maintain sealing stress when equipment suffers thermal expansion or bolt relaxation.
• Maximum working pressure: 40 bar. Suitable for medium‑pressure flange joints in process pipelines and equipment.
• Operating temperature range: ‑240 ~ +550 °C. Adaptable to cryogenic cold‑medium pipelines, steam systems and high‑temperature process equipment.
• Chemical pH resistance range: 0‑14. Exhibits excellent corrosion resistance toward most acids, alkalis, solvents and steam media, covering most common chemical‑process working fluids.

Dimensional Standards & Customisation

MECNME graphite jointing gaskets are available to conform to mainstream global gasket standards, including ASME B 16.21 and DIN 2690, covering most standard‑size flanges widely used in petrochemical, power, energy and general process industries. Beyond standard dimensions, MECNME supports fully customised non‑standard dimensions and special outlines. According to customers’ drawings, field‑measured flange parameters or unique equipment requirements, gaskets can be tailor‑made for special‑shaped joints, large‑diameter non‑standard flanges and maintenance‑oriented replacement parts.

Typical Application Scope

MECNME high‑purity graphite jointing gaskets find extensive deployment across power plants, petrochemical facilities, chemical processing, heat‑supply systems and nuclear‑grade projects. They are widely used for flange sealing of pipelines, vessels, heat exchangers and various process equipment. Thanks to comprehensive temperature resistance, broad pH compatibility and convenient processing performance, they serve as reliable general‑purpose non‑metallic sealing solutions for both routine production maintenance and special high‑spec industrial projects. When selecting grades, users may choose the conventional 98%‑purity type for ordinary working conditions and specify the 99.8% high‑purity grade for nuclear‑industry and other high‑purity‑required scenarios.