VDI 3400 refers to the texture standard developed by the Association of German Engineers (VDI).
It is mainly processed by electric discharge machining (EDM) during mold processing, but it can also be completed by traditional texture methods of chemical etching.
There are 45 levels for VdI 3400 texture,from VDI 3400 #0 to #45 (RA 0.10 μm to RA 18.00 μm), but the most commonly used textures are the following 12 item.
VDI 12, VDI 15, VDI 18, VDI 21, VDI 24, VDI 27
VDI 30, VDI 33, VDI 36, VDI 39, VDI 42, VDI 45
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