# High-density graphite

High-density graphite (isostatic, molded or vibration-molded) for precision parts, industrial blocks, and CNC machining in Mexico.

Source: https://esgraf.com/en/materials/technical-graphite/high-density

**High-density graphite** is technical graphite bought as a single family for precision parts, industrial blocks, EDM electrodes and CNC machining: the specific process — isostatic / isomolded, molded or vibration-molded — is chosen by part size, volume, isotropy and tolerance, not as separate catalogs.

The **typical ranges** in the technical panel reflect the reference isostatic grade (≥1.78 g/cm³); molded and vibration-molded sit in lower bands (see below). The exact value is confirmed at quote according to the application.

Inventory and CNC in García, N.L.

## Isostatic graphite (isomolded)

Synthetic graphite obtained by cold isostatic pressing (CIP) and graphitization. Fine grain (4–25 µm), near-isotropic properties and excellent machinability for **EDM**, vacuum crucibles, semiconductors and precision CNC parts.

| Property | Typical range |
| --- | --- |
| Apparent density | 1.80–1.90 g/cm³ |
| Open porosity | 10–14 % |
| Flexural strength | 35–60 MPa |
| Thermal conductivity | 100–150 W/m·K |
| Ash content | <0.1 % |

Formats: blocks, plates, cylinders and bar; CNC to drawing.

## Molded graphite

Produced by cold molding and sintering/graphitization. Typical formats: **blocks, discs and rings** for crucibles, nozzles, refractories and large electrodes when the fine grain of isostatic graphite is not critical. Die-molding reference: SGL **HMR** (wheel molds; ~1.65 g/cm³, 0.8 mm grain).

| Property | Typical range |
| --- | --- |
| Apparent density | 1.65–1.78 g/cm³ |
| Grain size | 0.5–4 mm |
| Flexural strength | 13–35 MPa |

For fine-detail EDM, isostatic is usually preferred; molded covers crucibles, nozzles and medium-to-large format electrodes.

## Vibration-molded graphite

Consolidated by vibration and particle-size compaction. Intended for **large blocks**, large-format electrodes and crucibles when the fine grain of isostatic graphite is not required.

| Property | Typical range |
| --- | --- |
| Apparent density | 1.66–1.85 g/cm³ |
| Grain size | 0.5–8 mm |
| Flexural strength | 15–28 MPa |

Reference: SGL MKUN.

## Glossary — isostatic vs isomolded

On the shop floor and in Mexican specifications, **isostatic graphite** and **isomolded graphite** are usually commercial synonyms for the same fine-grain CIP material. Commercial grades, impregnations and supply formats are specified on this datasheet and at quote.

See also [extruded graphite](https://esgraf.com/en/materials/technical-graphite/extruded) and [EDM graphite](https://esgraf.com/en/materials/technical-graphite/edm).

## Technical properties

| Property | Value |
| --- | --- |
| Apparent density | 1.78–1.90 g/cm³ |
| Flexural strength | 39–90 MPa |
| Grain size | 4 µm – 8 mm |
| Thermal conductivity | 60–150 W/m·K |
| Open porosity | 6–14 % |

## Also known as
- Isostatic graphite
- Isomolded graphite
- Molded graphite
- Vibration-molded graphite

## Advantages
- High density and machinability
- Dimensional stability
- Low ash content
- Formats from precision parts to large blocks

## Presentations
- Blocks
- Plates
- Cylinders
- Discs and rings

## Brand cross-reference

| Brand | Comparable grades |
| --- | --- |
| MERSEN | 2114, 2124, 2191, 2204, C50, 2235 |
| SGL Carbon | R6510, R6650, R6660, R6710, R4340, R4500, R4550, R4710, R4800, SIGRAFINE, HMR, MKUN |
| Graphite India | GLI A11, GLI A21, GLI A22, DXN, XN, DXT |
| Nippon Graphite | IGS743, IGS744, IGS603, IGS644, IGS652, IGS844, IGS895, GS-203, GS-203R |
| Toyo Tanso | IG-11, IG-43, ISO-68, ISO-63, TTK-4, TTK-5 |
| Entegris POCO | TM, AXF-5Q, AXM-5Q, AXZ-5Q, ZXF-5Q |
| GRAFTECH | ATJ |
| UCAR | ATJ |

Indicative reference by family and typical properties. It implies neither authorized distribution nor certified equivalence; it is confirmed in technical review.

## Frequently asked questions

### What is isostatic or isomolded graphite?

It is technical graphite compacted by cold isostatic pressing (CIP) and then graphitized. In the industry it is also called isomolded. It offers more uniform properties, fine grain (µm) and good machinability for EDM and precision parts.

### Are isostatic and isomolded the same thing?

In Mexican commercial practice, yes — both terms usually refer to the same type of fine-grain CIP material.

### How does it compare with extruded or molded graphite?

Isostatic prioritizes uniformity and fine grain. Extruded stands out in rods and tubes; molded in large parts with less critical requirements.