**ELLOR®+ EDM Graphite Grades**

ELLOR®+ EDM Graphite Grades

Electrical Discharge Machining (EDM) – The full range of isostatic ELLOR® grades, from universal to ultra-fine grain graphite, is dedicated to electrical discharge machining, also known as Spark Machining or Die Sink EDM. ELLOR® is a globally recognized leading brand.

ELLOR® offers the most comprehensive range of EDM graphite grades on the market. With support from our experts, you can select the ideal grade for your project.

EDM Applications:

• Deep cavity mold manufacturing

• Forging dies

• Die-casting molds

• Injection molding tools

• Turbine production

Key Factors in Selecting the Right Graphite Grade:

1. Wear Resistance (WR):
How long can the electrode maintain its detailed surface during sparking?

• High wear resistance means fewer electrodes are needed, reducing production costs.

• Under the same machining parameters, coarse-grain graphite wears faster than fine-grain graphite.

2. Metal Removal Rate (MRR):
How quickly does the graphite electrode remove material during EDM?

• Generally, larger grain graphite results in faster material removal.

• Fine-grain graphite removes less metal per spark but provides a smoother surface finish.

3. Surface Finish:
How smooth should the workpiece surface be?

• Fine-grain graphite is ideal for achieving very fine, smooth finishes, with surface roughness down to 0.4 Ra (µm).

• This is especially beneficial for complex shapes, where final manual finishing would be time-consuming and costly.

4. Machinability:
How easily can the graphite electrode be machined into detailed shapes?

• Graphite quality can vary; for precision electrodes, ultra-fine grain graphite is essential.

• The machining time of the electrode depends on:

  • The grain size of the graphite

  • The strength of the graphite

  • The complexity of the electrode geometry

With ELLOR®+, Mersen provides custom-fit EDM graphite solutions for every machining need—from roughing to finishing—ensuring efficiency, precision, and surface quality.

Universal Fine-Grain Graphite Grades

Ellor® 18
Universal fine-grain grade. Medium-density graphite ideal for roughing operations with minimal time and cost.

• Best suited for pre-machining rough cuts

• Recommended for aluminum die casting molds

Ellor® 20
Universal fine-grain grade for both roughing and finishing operations. Ideal for plastic injection mold production.

• High material removal rate shortens machining cycles

• Excellent machinability

• Best choice for achieving medium surface finishes

Ellor® 25
Universal super-fine grain grade with higher density for better surface quality. Its mechanical properties ensure extended electrode life.

• Good metal removal rate

• Excellent strength and wear resistance

• Easy to machine

• Excellent surface finish: 1.6 Ra (µm)

Exceptionally Super-Fine Grain Grades

Ellor® 30
Exceptional super-fine grain grade. Offers better surface finish and lower electrode wear.

Ellor® 40
Exceptional super-fine grain grade. Delivers excellent surface quality with minimal wear.

Ellor® 50
Exceptional super-fine grain grade. Very fine structure and high density allow for precise detail machining and remarkable surface finish, while minimizing electrode wear.

• Outstanding surface finish: 0.56 Ra (µm)

• Excellent strength and wear resistance for detailed and fine surface structures

• High metal removal rate (MRR)

• Preferred material by phone manufacturers

Premium Ultra-Fine Grain Grade

Ellor® DS4
Premium-grade ultra-fine grain graphite. Designed for applications demanding exceptional surface finishing, strength, and wear resistance.

• Exceptional surface finish: 0.4 Ra (µm)

• Superior strength and wear resistance, ideal for complex and fine features