QDZRT Graphite supplies isostatic, molded and extruded synthetic graphite as billets or custom-machined parts. Use this reference to compare QDZRT Graphite material grades by supply window, then confirm dimensions, the required property combination and drawing requirements with our team.
Typical / reference properties unless a minimum or maximum value is explicitly stated. Final order specifications are confirmed by grade and batch.
| Material Grade | Bulk DensityBulk Density (ASTM C559 / C838)(g/cm³) | Grain SizeAverage / Maximum Grain Size | Flexural StrengthFour-Point Flexural Strength (ASTM C651)(MPa) | Compressive StrengthCompressive Strength (ASTM C695)(MPa) | Shore HardnessScleroscope / Shore Hardness (HSD) | ResistivitySpecific Electrical Resistivity (ASTM C611)(μΩ·m) | Thermal ConductivityThermal Conductivity at 20°C(W/(m·K)) | CTECoefficient of Thermal Expansion (CTE, 20–100°C)(×10⁻⁶/K) | AshAsh Content / Purity (ASTM C561 / DIN 51903) | Supply Range Note |
|---|---|---|---|---|---|---|---|---|---|---|
| DJY-T01 | 1.72 g/cm³ | — | 30 MPa | 65 MPa | 40 | 10–13 μΩ·m | 100 W/(m·K) | 5.0 ×10⁻⁶/K | 500 ppm | Typical / reference properties unless a minimum or maximum value is explicitly stated. Final order specifications are confirmed by grade and batch. |
| DJY-T02 | 1.90 g/cm³ | — | 55 MPa | 105 MPa | 55 | 8–10 μΩ·m | 135 W/(m·K) | 3.6 ×10⁻⁶/K | 500 ppm | Typical / reference properties unless a minimum or maximum value is explicitly stated. Final order specifications are confirmed by grade and batch. |
| DJY-T03 | 1.76 g/cm³ | 8 μm | 40 MPa | — | 40 | 12–16 μΩ·m | — | — | — | Typical / reference properties unless a minimum or maximum value is explicitly stated. Final order specifications are confirmed by grade and batch. |
| DJY-T04 | 1.88–1.92 g/cm³ | 2 μm | 60 MPa | 125 MPa | 75 | 10–14 μΩ·m | 110 W/(m·K) | 3.9 ×10⁻⁶/K | — | Typical / reference properties unless a minimum or maximum value is explicitly stated. Final order specifications are confirmed by grade and batch. |
| MY-T01 | 1.80 g/cm³ | — | 40 MPa | 80 MPa | 45 | 8–10 μΩ·m | 125 W/(m·K) | 4.9 ×10⁻⁶/K | 500 ppm | Typical / reference properties unless a minimum or maximum value is explicitly stated. Final order specifications are confirmed by grade and batch. |
| MY-T02 | ≥1.758 g/cm³ | 14–20 μm | ≥119 MPa | ≥352 MPa | ≥113 | ≤33.63 μΩ·m | ≤65 W/(m·K) | 6.4 ×10⁻⁶/K | — | Typical / reference properties unless a minimum or maximum value is explicitly stated. Final order specifications are confirmed by grade and batch. |
| MY-T03 | 1.84 g/cm³ | 8–12 μm | 53.75 MPa | 106.6 MPa | 56 | 11.8 μΩ·m | 156 W/(m·K) | 4.4 ×10⁻⁶/K | — | Typical / reference properties unless a minimum or maximum value is explicitly stated. Final order specifications are confirmed by grade and batch. |
| JY-T01 | ≥1.72 g/cm³ | Coarse | ≥14 MPa | ≥34 MPa | — | ≤8.5 μΩ·m | — | — | ≤0.3% | Typical / reference properties unless a minimum or maximum value is explicitly stated. Final order specifications are confirmed by grade and batch. |
| JY-T02 | ≥1.72 g/cm³; 1.74 g/cm³ (Typical) | ≤0.8 mm | ≥13.5 MPa; 15.5 MPa (Typical) | ≥32 MPa; 38 MPa (Typical) | — | ≤9.0 μΩ·m; 8.5 μΩ·m (Typical) | ≥120 W/(m·K); 140 W/(m·K) (Typical) | ≤2.8 ×10⁻⁶/K; 2.4 ×10⁻⁶/K (Typical) | ≤0.2%; 0.10% (Typical) | Typical / reference properties unless a minimum or maximum value is explicitly stated. Final order specifications are confirmed by grade and batch. |
Use the test method specified by the drawing, purchase specification or agreed CoA. Similar property names can produce different values when specimen geometry, orientation or test method changes.
| Physical Property Parameter | ASTM Standard | ISO / DIN Standard | Units | Engineering Significance |
|---|---|---|---|---|
| Bulk Density / Apparent Density | ASTM C559-16(2020) / ASTM C838-16(2023) | — | g/cm³ | C559 covers bulk density by physical measurements of manufactured carbon/graphite articles; C838 covers as-manufactured shapes. Record the method used on the test report or CoA. |
| Flexural Strength — Four-Point Loading | ASTM C651-20 | ISO 12986-2:2014 (four-point); ISO 12986-1:2014 (three-point) | MPa | C651 uses four-point loading for manufactured carbon/graphite at room temperature. ISO 12986-1 and -2 are standards for carbon materials used in aluminium production; Part 1 uses three-point loading and Part 2 uses four-point loading for carbon/solid graphite. |
| Flexural Strength — Three-Point Loading | ASTM D7972-14(2020) | ISO 12986-1:2014 | MPa | ISO 12986-1 uses a three-point method for carbon and solid graphite. Use the same specimen geometry, orientation and bending method when comparing strength values. |
| Compressive Strength | ASTM C695-21 | — | MPa | Compares graphite used under compressive loading. Specimen geometry and material orientation must be controlled for meaningful comparisons. |
| Electrical Resistivity | ASTM C611-21 | — | μΩ·m | Important for EDM and electrical-heating applications. Material orientation and temperature affect the reported value. |
| Coefficient of Linear Thermal Expansion | ASTM E228-22 | — | 10⁻⁶/K | Relevant to thermal cycling, assemblies with metals and dimensional change across temperature. |
| Thermal Diffusivity — Flash Method | ASTM E1461-13(2022) | — | mm²/s | E1461 directly measures thermal diffusivity. Thermal conductivity is calculated from diffusivity, density and specific heat. |
| Ash Content | ASTM C561-23 | — | ppm or % | C561 provides a practical ash estimate for commercially available graphite and is not intended for purified graphite. For high-purity graphite, define the required elemental impurity limits and analytical method in the purchase specification. |
We use service conditions, drawing requirements, target properties, available billet sizes and purchasing requirements to narrow the available material options before quotation.
Prioritize grain size, density, flexural strength, electrical resistivity, machinability and electrode detail.
Define carbon content or impurity limits, purification route, particle/ash controls, cleaning, packaging and the required test method.
Define atmosphere, maximum temperature, thermal cycle, electrical resistivity, mechanical loading and oxidation exposure.
Prioritize thermal cycling, chemical compatibility, density, strength, size availability, cleaning and operating atmosphere.
Review thermal behavior, oxidation exposure, strength, surface finish, dimensional stability and metal compatibility.
Define fluid, pressure, temperature, mating surface, wear/friction requirement, permeability and dimensional tolerances.
Send the 2D/3D drawing, quantity, operating conditions, material properties and inspection requirements for DFM and quotation.
Not automatically. Two graphite grades with similar density can still differ in grain structure, anisotropy, mechanical strength, electrical resistivity, thermal properties, purification level, and raw graphite block dimensions. We match customer requirements property-by-property to identify the suitable QDZRT Graphite material grade from our factory production.
Yes. For high-purity graphite applications, state the required fixed carbon content, elemental ash limits, and verification method. Our quotation defines the purification route, testing protocols, and CoA document scope.
Yes. State the material, required specification, test items, CoA/TDS fields and third-party testing requirements in the inquiry. The quotation defines the technical review and document scope.
No. Compare density together with grain size, forming route, flexural/compressive strength, electrical resistivity, thermal expansion, ash/purity requirements, anisotropy and available graphite blank size. Similar density does not establish grade equivalence.
No. The published values are typical supply windows for preliminary selection. Confirm the required combination of properties, block size, test items and any document requirements in the quotation or purchase specification.
Send your application requirements, operating environment, or existing material drawing. QDZRT Graphite engineers evaluate mechanical, thermal, and purity parameters to recommend the optimal factory-direct graphite grade.