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NX Series High-Purity, Fine-Grained Molded Graphite Blocks | High-Temperature and Corrosion-Resistant Industrial Graphite Materials

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NX Series High-Purity, Fine-Grained Molded Graphite Blocks | High-Temperature and Corrosion-Resistant Industrial Graphite Materials

Jiangxi Ningheda New Material Co., Ltd. specializes in the production of high-purity molded graphite blocks with a density of 1.78–1.90 g/cm³, ash content ≤0.06%, and grain size of 25 μm. These products are suitable for precision industrial applications such as EDM electrodes, sintering dies for cemented carbide, heating elements for vacuum furnaces, and single-crystal silicon pulling in the semiconductor industry. Directly supplied from an ISO 9001-certified factory, we support custom orders, with a minimum order quantity of 1 piece and 24-hour quoting.

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Modelo:
Customized
Marca do Produto:
NHD

Product Description

▍Product Description

Ningheda molded graphite blocks are high-performance synthetic graphite materials specifically designed for demanding industrial environments. Through advanced processes—including formulation and mixing, high-pressure molding, carbonization, and high-temperature graphitization—we have achieved a highly uniform and isotropic internal structure.

Unlike traditional extruded or vibration-molded graphite, our NX series of molded graphite blocks utilize a 25μm fine-grain formulation. This enhances material strength and machining precision while maintaining high-temperature resistance, corrosion resistance, and thermal shock stability. The blocks can withstand prolonged exposure to ultra-high-temperature environments and erosion by acidic and alkaline media, providing customers with stable and reliable long-term performance.

To meet the diverse needs of various industrial applications, we offer three standard models: NX603, NX604, and NX605. Customers can select the appropriate model based on key parameters such as density, strength, and ash content, or request customized specifications. We provide purification, modification, and custom machining services tailored to specific requirements.

Raw graphite billet, fine grain molded structure, ready for custom machining

Standard Molded Graphite Block

Long Rectangular Graphite Block

Two high-density graphite cubes stacked, isotropic fine grain, density 1.85-1.90 g/cm³

Custom Size Graphite Block

▍Product Advantages: Why Choose Ningheda Molded Graphite Blocks?

Areas of Strength	Performance of the Ningheda NX Series	Actual value to users
Structural isotropy	Three-directional density deviation <3%	During EDM machining, electrode wear is uniform, resulting in higher precision of the mold cavities.
Fine-grained structure	Average grain size: 25 μm	Surface roughness Ra ≤ 3.2 μm; suitable for direct use in precision mold cavities
Precise density grading	Available in three sizes: 1.78, 1.85, and 1.90	Select the most cost-effective solution based on operating conditions to avoid over-purchasing
Ultra-high purity; customizable	Standard ash content ≤ 0.06%; can be purified to 30 ppm	Suitable for ultra-high-purity applications such as semiconductors and monocrystalline silicon for photovoltaics
Large-scale molding capability	Maximum dimensions: 1500 × 600 × 200 mm	Reducing Seams to Improve Thermal Field Uniformity in Large Vacuum Furnaces
Fully automated process control	End-to-end ISO 9001 quality control from raw materials to finished products	High batch-to-batch consistency reduces customers' costs for incoming inspection

▍Detailed Technical Specifications

We offer three different density grades to meet varying precision requirements:

Parameter Items	Unit	NX603 (Standard Type)	NX604 (High-Density Type)	NX605 (Ultra-High-Density Type)
Average particle size	μm	25	25	25
Bulk density	g/cm³	≥ 1.78	≥ 1.85	≥ 1.90
Compressive strength	MPa	≥ 70	≥ 80	≥ 90
Flexural strength	MPa	≥ 35	≥ 38	≥ 42
Resistivity	μΩm	≤ 12	≤ 11	≤ 10
Shore hardness	HSD	50	55	60
Ash content	%	≤ 0.06	≤ 0.05	≤ 0.03

Note: The above data are standard values. For non-standard custom orders or special purification requirements, please consult our technical engineers.

Ultra-high purity graphite block, ash content ≤30ppm, light gray color for semiconductor use

High Purity Molded Graphite Block

Oversized graphite stock material, max dimension 1500mm, for large furnace components Large Size Graphite Stock Block

Precision-cut matched graphite block set, tight tolerance ±0.05mm, paired components

Precision Machined Graphite Block

▍Product Applications and Benefits

EDM (Electrical Discharge Machining): With a fine-grained structure, it offers high machining precision and low material loss, making it ideal for precision molds and complex cavity machining. It provides excellent electrode consistency, thereby improving machining efficiency.
Heat Treatment Industry: Excellent thermal stability and minimal deformation make it suitable for use as heat treatment fixtures and jigs, compatible with equipment such as vacuum furnaces and atmosphere furnaces.
Chemical Processing Equipment: Outstanding corrosion resistance enables the manufacture of components such as reactors, heat exchangers, and seals, making it suitable for acidic and alkaline environments, ensuring safe and stable operation.

Precision wire EDM machining process using high-quality graphite electrode to cut hardened metal parts with sparks

EDM Electrode Machining

Industrial heat treatment furnace interior showing red-hot metal components being processed, utilizing durable graphite heating elements and insulation

High-temperature heat treatment

Large scale chemical processing plant infrastructure featuring corrosion-resistant graphite heat exchangers and piping systems for acid recovery

Corrosion-Resistant Chemicals

▍Product Shipping and Delivery

Items	Details
Packaging Method	Export-grade fumigation-free wooden crates, lined with moisture-proof plastic film and shock-absorbing foam; each crate includes a label (product name, specifications, net weight, gross weight, batch number)
Shipping Method	Sea freight (full container load/less than container load), air freight, international express (DHL/FedEx/UPS)
Port of Departure	Port of Shanghai, Port of Tianjin (as specified by the customer)
Delivery time (excluding the time required to apply for an export license)	Standard products: 7–15 days; Custom processing: 15–25 days; Large quantities or special specifications: subject to confirmation upon consultation
Terms of Trade	FOB, CIF, CFR, EXW, DDP (negotiable)
Payment Methods	T/T (50% prepayment, balance due before shipment); L/C (for large orders); payment terms are negotiable for long-term partners

Export Experience: Ningheda’s products are exported to more than 30 countries, including Germany, the United States, Japan, South Korea, India, and Russia. We are well-versed in the customs clearance documentation requirements of these countries (such as Certificates of Origin, Form E, and Material Safety Data Sheets).

▍FAQ

Q1: What is the difference between molded graphite blocks and isostatic graphite blocks? Which one should I choose?
A: Molded graphite is produced using unidirectional or bidirectional compression, making it suitable for manufacturing block-shaped products with similar dimensions and offering good value for money. Isostatic graphite is produced using 360° uniform compression, resulting in superior isotropy, but it is 30–50% more expensive.
Selection Recommendations: For general-purpose EDM electrodes, sintering dies, and continuous casting dies, molded graphite is sufficient. For extreme applications such as semiconductor wafer pulling, isostatic graphite is recommended. Ningheda offers both processes; please provide specific operating conditions so our technical team can make a recommendation.
Q2: Are you a genuine manufacturer?
A: Yes. Jiangxi Ningheda New Materials Co., Ltd. operates a 70,000-square-meter modern factory and is an ISO 9001-certified direct manufacturer. We have a complete production line covering everything from raw material processing to the finishing of finished products; we are not a trading company.
Q3: What is your minimum order quantity (MOQ)? Do you provide samples?
A: We accept orders starting from a single unit. We also offer free samples (within standard dimensions of 100x100x100mm); you only need to cover the international shipping costs. For complex custom samples, we charge a basic material and processing fee, but this can be offset against the cost of a subsequent formal order upon negotiation.
Q4: Can your graphite materials be further purified?
A: Yes. Although the standard ash content is already very low, we can further purify it to 30 ppm for specific semiconductor applications.
Q5: What should I do if I find cracks or defects in the graphite block after receiving it?
A: We conduct rigorous factory inspections. If the product is damaged during shipping, please take photos immediately and contact us; we will assist you in filing a claim with your insurance company. If the issue is due to a product defect, we promise to replace the item free of charge or issue a refund.