VDI 3400 Mold Texture and Drafting Angle

VDI 3400 texture for plastic injection mold

Bayer Plastics has some good Information about surfaces and injection molding available on their web- Site.
According to a (German) Document the VDI 3400 surfaces correspond to the following Ra / Rz Values and require the following drafting angles:

VDI3400RaRzDA-PADA-PCDA-ABS
120.40 1.50 0.5 1.0 0.5
150.56 2.40 0.5 1.0 0.5
180.80 3.30 0.5 1.0 0.5
211.12 4.70 0.5 1.0 0.5
241.60 6.50 0.5 1.5 1.0
272.24 10.50 1.0 2.0 1.5
303.15 12.50 1.5 2.0 2.0
334.50 17.50 2.0 3.0 2.5
366.30 24.00 2.5 4.0 3.0
399.00 34.00 3.0 5.0 4.0
4212.50 48.00 4.0 6.0 5.0
4518.00 69.00 5.0 7.0 6.0

DA-PA = Drafting Angle for Polyamide
DA-PC = Drafting Angle for Polycarbonate
DA-ABS = Drafting Angle for Acrilnitrile-Butadiene-Styrol

glass reinforced materials require more drafting.

VDI 3400 Table
In the following, you can determine the roughness for your application according to VDI 3400 table.

VDI3400  0-45µm µinchN3-N10ISO1302 Rt µm
00.10 4N3 
10.11 4.4  
20.12 4.8  
30.14 5.6  
40.16 6.4  
50.18 7.2N4 
60.20 8  
70.22 8.8  
80.25 10  
90.28 11.2  
100.32 12.8  
110.35 14N5 
120.40 16 1.6
130.45 18  
140.50 20  
150.56 22.4 3.2
160.63 25.2  
170.70 28  
180.80 32N65
190.90 36  
201.00 40  
211.12 44.8  
221.26 50.4  
231.40 56  
241.62 63 12
251.80 72N7 
262.00 80  
272.20 88 16
282.50 100  
292.80 112  
303.20 125N820
313.50 140  
324.00 160  
334.50 180 25
345.00 200  
355.60 224  
366.30 250N937
377.00 280  
388.00 320  
399.00 360 46
4010.00 400  
4111.20 448  
4212.60 500N1060
4314.00 560  
4416.00 640  
4518.00 760 85

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