VDI 3400 Mold Texture and Drafting Angle

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

VDI3400	Ra	Rz	DA-PA	DA-PC	DA-ABS
12	0.40	1.50	0.5	1.0	0.5
15	0.56	2.40	0.5	1.0	0.5
18	0.80	3.30	0.5	1.0	0.5
21	1.12	4.70	0.5	1.0	0.5
24	1.60	6.50	0.5	1.5	1.0
27	2.24	10.50	1.0	2.0	1.5
30	3.15	12.50	1.5	2.0	2.0
33	4.50	17.50	2.0	3.0	2.5
36	6.30	24.00	2.5	4.0	3.0
39	9.00	34.00	3.0	5.0	4.0
42	12.50	48.00	4.0	6.0	5.0
45	18.00	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  0-45	µm	µinch	N3-N10	ISO1302 Rt µm
0	0.10	4	N3
1	0.11	4.4
2	0.12	4.8
3	0.14	5.6
4	0.16	6.4
5	0.18	7.2	N4
6	0.20	8
7	0.22	8.8
8	0.25	10
9	0.28	11.2
10	0.32	12.8
11	0.35	14	N5
12	0.40	16		1.6
13	0.45	18
14	0.50	20
15	0.56	22.4		3.2
16	0.63	25.2
17	0.70	28
18	0.80	32	N6	5
19	0.90	36
20	1.00	40
21	1.12	44.8
22	1.26	50.4
23	1.40	56
24	1.62	63		12
25	1.80	72	N7
26	2.00	80
27	2.20	88		16
28	2.50	100
29	2.80	112
30	3.20	125	N8	20
31	3.50	140
32	4.00	160
33	4.50	180		25
34	5.00	200
35	5.60	224
36	6.30	250	N9	37
37	7.00	280
38	8.00	320
39	9.00	360		46
40	10.00	400
41	11.20	448
42	12.60	500	N10	60
43	14.00	560
44	16.00	640
45	18.00	760		85