VDI 3400 Texture Standards
The VDI 3400 standard (Verein Deutscher Ingenieure) provides a comprehensive range of EDM textures. These finishes are achieved through controlled electrical discharge machining for consistent, repeatable results.
EDM Texture Process
VDI textures are created using electrical discharge machining (EDM), which produces consistent, uniform surface patterns that are highly repeatable across multiple molds.
Precise Control
Each VDI grade corresponds to a specific Ra (roughness average) value, allowing precise specification and quality control for your exact surface requirements.
Wide Range
From fine VDI 12 (near-polish) to coarse VDI 45 (heavy texture), we offer the full spectrum of VDI finishes to match any functional or aesthetic requirement.
| VDI Grade | Ra Value | Description | Typical Application |
|---|---|---|---|
| VDI 12 | 0.40 μm | Light polish finish | Semi-gloss surfaces |
| VDI 15 | 0.56 μm | Fine matte finish | Low gloss cosmetic parts |
| VDI 18 | 0.80 μm | Light texture | Satin finish products |
| VDI 21 | 1.12 μm | Light sandblast | Matte textured surfaces |
| VDI 24 | 1.60 μm | Medium sandblast | Standard textured finish |
| VDI 27 | 2.24 μm | Fine EDM texture | Uniform matte texture |
| VDI 30 | 3.15 μm | Medium EDM texture | Industrial textured parts |
| VDI 33 | 4.50 μm | Standard EDM texture | Grip surfaces, handles |
| VDI 36 | 6.30 μm | Coarse EDM texture | Rough matte, functional |
| VDI 39 | 9.00 μm | Heavy EDM texture | Deep texture, non-slip |
| VDI 42 | 12.50 μm | Very coarse texture | Maximum grip surfaces |
| VDI 45 | 18.00 μm | Extreme texture | Special industrial use |
Need Help Selecting the Right Finish?
Our engineering team can recommend the optimal SPI or VDI finish based on your part function, material, and aesthetic requirements. We also offer custom texturing including Mold-Tech patterns.