Graphite Mold Supplier: The Industry Leader In High-density Graphite
As a global leading supplier of graphite molds, we have been deeply engaged in the research and development of high-density graphite materials, providing high-precision and highly reliable mold solutions for semiconductor, vacuum furnaces, electronic equipment, and the new energy industry chain. Our core advantage lies in the ultimate performance of high-density graphite: purity up to 99.99% (industry average 99.9%), thermal conductivity of 180 W/m·K (traditional graphite only 120 W/m·K), and thermal expansion coefficient controlled at 3.2 × 10⁻⁶/℃ (far lower than the industry standard 5.0 × 10⁻⁶/℃). Verified by the authoritative National Institute of Standards and Technology (NIST), such molds have a lifespan of over 800 cycles in semiconductor chip packaging, while traditional suppliers' molds typically last only 400 cycles - this means enterprises can reduce 30% of production downtime costs.
.
In scenarios with high requirements such as vacuum furnace heat treatment, 5G radio frequency component manufacturing, and production of new energy battery electrodes, our high-density graphite molds achieve a tolerance of millimeter level (±0.01mm) and a surface roughness of Ra ≤ 1.2μm. For instance, the battery electrode die customized for a certain head lithium battery enterprise remained free of cracks after 1000 vacuum thermal cycle tests, while the competing molds had already developed micro-cracks after 400 cycles. This directly supports the urgent demand of the new energy industry for high-density and high-stability molds.
Why choose us?
As a professional supplier of graphite molds, the key reason why we stand out from our competitors lies in:
Better materials
The graphite has a high density with a purity of 99.99% (impurity content < 0.01%), significantly reducing the defect rate in semiconductor manufacturing;
More usage times
The lifespan of the vacuum furnace application has increased by more than 50% (800 times vs 400 times), meeting the long-term high-load requirements of new energy equipment;
Industry customization depth
For scenarios such as semiconductor lithography and vacuum furnace heat treatment, we provide end-to-end solutions instead of general molds.
Traditional suppliers often experience early mold failure due to material impurities. However, through full-chain quality control (from graphite raw materials to mold cavity processing), we have reduced the failure rate of molds in extreme environments by 65%. In the electronics and electrical field, customers have verified that our molds can reduce the waste rate of battery electrode sheets from 15% to 8%, directly increasing production capacity by 30%.
Traditional suppliers often experience early mold failure due to material impurities. However, through full-chain quality control (from graphite raw materials to mold cavity processing), we have reduced the failure rate of molds in extreme environments by 65%. In the electronics and electrical field, customers have verified that our molds can reduce the waste rate of battery electrode sheets from 15% to 8%, directly increasing production capacity by 30%.
We are always at your service when you need
Choose us, and you choose the most reliable graphite mold supplier in the industry. Based on high-density graphite, we continuously enhance the efficient and precise manufacturing in fields such as semiconductors, vacuum furnaces, and new energy - ensuring that each piece of equipment carries a more enduring innovative power.
active members
years experience
Success Case
Expert team
Why choose us?
1. Super high quality: Comprehensive control over every aspect from materials to processes.
2. Core technology fully controllable: Proficient in key processes such as high-temperature graphitization and purification, supporting 72-hour non-standard customization response.
3. Ultimate quality guarantee: High-purity products reach 5N + purity, resistant to 3000℃ high temperature + strong corrosion, with full batch traceable testing.
4. Uninterrupted full-cycle service: Large-scale production + 5-7 days small-batch delivery, 24-hour technical response + on-site support.
| lassification | specific project | Core requirements/scope | Explanation (adapted to fuel cell requirements) |
| 1. Physical characteristics | |||
| density | 1.80-1.95g/cm ³ (mainstream 1.85-1.90g/cm ³) | Low density → high porosity, easy to leak; Excessive → difficult processing and increased cost, 1.85-1.90g/cm ³ balances performance and cost | |
| Porosity (after immersion) | ≤ 5% (substrate porosity of 15% -20%) | Pores need to be filled by impregnation to prevent hydrogen/oxygen leakage and electrolyte leakage, ensuring the sealing of the fuel cell stack | |
| water absorption rate | ≤1% | Low water absorption rate avoids the impact of material water absorption on conductivity and structural stability | |
| 2. Conductivity and thermal conductivity | |||
| volume resistivity | ≤ 10 μ Ω· m (preferably ≤ 8 μ Ω· m) | Low resistivity reduces current conduction loss, improves stack efficiency, and meets the conductivity requirement of ≥ 180S/cm for the stack | |
| thermal conductivity | ≥120W/(m·K)(25℃) | Quickly conduct the reaction heat of the fuel cell stack, avoid local overheating causing aging of the membrane electrode, and adapt to water-cooled/air-cooled heat dissipation systems | |
| 3. Mechanical properties | |||
| compressive strength | ≥ 60MPa (preferably ≥ 80MPa) | Resist the assembly pressure of the fuel cell stack (usually 0.5-1.0MPa) to prevent deformation or rupture | |
| Shore hardness (HS) | ≥ 60 (after immersion) | Improve surface wear resistance, reduce friction loss with membrane electrodes, and extend service life | |
| fracture toughness | ≥1.2MPa·m¹/² | Avoid brittle fracture during processing or use, and adapt to frequent start-up and shutdown conditions of the reactor | |
| 4. Chemical properties | |||
| Fixed carbon content | ≥ 99.95% (high-purity grade), preferably ≥ 99.99% | Low impurities (ash content ≤ 5ppm) prevent corrosion products from contaminating the membrane electrode, ensuring a 5000-8000 hour service life of the fuel cell stack | |
| ash content | ≤ 5ppm (preferably ≤ 3ppm) | Impurities (Fe, Si, Al, etc.) can catalyze the degradation of membrane electrodes and need to be strictly controlled | |
| corrosion resistance | Resistant to 0.5-2.0mol/L H ₂ SO ₄ (80 ℃) and 100% humidity environment, without corrosion or leaching | Adapt to the acidic operating environment of fuel cells, with no performance degradation after long-term use | |
| 5. Processing accuracy | |||
| flatness | ≤ 0.02mm/m (preferably ≤ 0.015mm/m) | Ensure a tight fit with the membrane electrode, reduce contact resistance, and prevent gas leakage | |
| dimensional tolerance | ± 0.03mm (critical dimension) | Adapt to the assembly accuracy requirements of the distribution stack to avoid sealing failure caused by dimensional deviations | |
| Channel machining accuracy | Channel width/depth tolerance ± 0.02mm, surface roughness Ra ≤ 0.8 μ m | Uniformly distribute hydrogen/oxygen to reduce fluid resistance and improve stack reaction efficiency | |
| 2, Characteristics of graphite material | 1. Core Features | High purity, high density, low porosity, excellent electrical and thermal conductivity, strong chemical stability, good corrosion resistance | Directly matching the core requirements of "leakage prevention, low loss, and long life" for fuel cells |
| 2. Feature adaptability | -High purity → corrosion-resistant and free from impurity pollution; -High density → low porosity leakage prevention; -High conductivity and thermal conductivity → reduce energy loss | The one-to-one correspondence between characteristics and technical parameters is the basis for meeting the operating conditions of fuel cells | |
| 3. Limitations and improvements | High brittleness and weak impact resistance → strength is improved by impregnating resin/metal; High processing difficulty → Optimizing CNC technology | Limitations need to be addressed through material selection and processing to adapt to actual usage scenarios | |
| 3, Selection criteria | 1. Substrate type | Prioritize isostatic pressed graphite (with good isotropy) and exclude molded graphite (with anisotropy affecting conductivity and heat conduction) | Isostatic pressure graphite ensures uniform performance in various areas of the fuel cell stack, avoiding local heating or poor conductivity |
| 2. Key indicators of substrate | Fixed carbon ≥ 99.95%, ash content ≤ 5ppm, density 1.85-1.90g/cm ³, porosity 15% -20% | The performance of the substrate directly determines the final quality of the bipolar plate, and strict control of the source material selection is required | |
| 3. Selection of impregnating materials | -Conventional scenario: Phenolic resin (low cost, mature process); -Mid to high end scenarios: epoxy resin (with excellent temperature resistance); -High power scenario: Copper/Tin (enhances strength and thermal conductivity) | Based on user needs, phenolic resin is suitable for medium power and cost sensitive scenarios, accounting for over 80% of the market share | |
| 4. Material selection verification | A substrate testing report (fixed carbon, ash content, density) and a post impregnation performance testing report (porosity, corrosion resistance) are required | Ensure that the material selection meets the supply chain access standards of fuel cell manufacturers | |
| 4, Processing requirements | 1. Core process | CNC precision machining → vacuum pressure impregnation → curing treatment → surface polishing → factory inspection | Each process affects the final performance, and impregnation and processing accuracy are key control points |
| 2. Key processing parameters | -CNC machining: spindle speed 10000-15000rpm, feed rate 50-100mm/min; -Immersion process: Vacuum degree ≤ 0.095MPa, temperature 160-180 ℃, insulation 2-4 hours; - Surface treatment: Ra ≤ 0.8 μ m | Optimize processing parameters to reduce edge breakage and cracks, and ensure uniform pore filling through impregnation parameters | |
| 3. Key process requirements | -Channel processing: using ball end milling cutters to avoid sharp corners (to prevent stress concentration); -Immersion: resin solid content of 30% -40%, ensuring penetration depth | The design of the flow channel affects gas distribution, and the impregnation quality determines the anti leakage performance | |
| 4. Testing standards | Factory inspection items: density, porosity, resistivity, flatness, dimensional tolerance, airtightness (gas permeability ≤ 1 × 10 ⁻⁸ cm ²/s) | ||
Hot Tags: fuel cell bipolar plate, China fuel cell bipolar plate manufacturers, suppliers, factory, die casting magnesium aluminum alloy mold, 3d graphite molds, high pressure die casting mold, hydrogen fuel cell plates, large graphite mold, graphite ingot mould
