Mold-Tech texture (different draft for imperial & metric, geometry)

"Dear S.Y.,
How are you?  Great hearing from  you.  Indeed I remember your kind support in HK. I have commented
it to my team  there and in my next trip to China we will for sure have a good chat while  having dinner and drinks. Your kindness is such that is not very usual these  days so a big thank you from me! 

As for your request  what your  customer is requesting is for you to plan a draft reserve for a texture with  0,004 depth, with MT (Mold-Tech) reference number not yet defined. What is not  clear is whether he is working in imperial or metric system and thus please make  sure you confirm before proceeding.
Below the different draft recommendation for  imperial and metric:

Texture depth vs draft:
1.  If Imperial:  0,004 inches = 0,1 mm = aprox. 100  microns
     Recommended draft in  favorable shrinkage conditions:
     9  degrees  (1,5 degrees for natural demoulding + 1 degree per each 13 microns depth)
2. If metric:  0,004 mm = aprox. 40  microns
    Recommended  draft in  favorable shrinkage conditions:
    4,5  degrees  (1,5 degrees for natural demoulding + 1 degree per each 13 microns  depth)

Please check below sketch. It shows  draft needs versus shrinkage conditions. If the part has a
geometry that shrinks  on to the grained surfaces than our recommendation is to double the minimum recommended draft.
Hope to see you soon. All the best  until then!
 Paulo Vilaca, Mold-Tech, Standex Engraving Group"