Design rules

There are a number of conditions that have to be taken into account in the etching process.

Material thickness

  • General: 0.003 - 1.5 mm.
  • Titanium standard up to and including 0.5 mm.
  • Other thicknesses are available on consultation.


  • Standard up to gross 550 x 550 mm.
  • Larger dimensions are available on consultation.


  • Standard +/- 10% of the material thickness with a minimum of +/- 0.01 mm.
    This can however vary depending on the material and configuration.
  • Special hole tolerances, for example H7, are etched as standard on undersize so that they can be reamed to size.
  • We always use nominal dimensions as a starting point.

Dam and slot width

  D = dam G = slot/hole
iron, carbon steel, stainless steel etc. 1 T 1,2 T
nickel 1,25 T       1,5 T
copper, bronze, brass, beryllium copper etc.   0,8 T 1,1 T
Gold 1,5 T 2 T
Aluminium 1,3 T 1,5 T
molybdenum, silver 0,8 T 1,1 T
Titanium 1,25 T 1,5 T

The minimum feasible dam and slot width is largely determined by the material thickness as follows:

  D = dam G = slot/hole
< 0,1 mm 1,2 T 1,2 T
0,1 - 0,2 mm   0,1 mm 1,1 T
> 0,2 mm 0,15 mm    1 T

Internal and external corner radius

  R1 R2
< 0,1 mm ≥ 0,75 T    ≥ 1 T   
0,1 - 0,2 mm   ≥ 0,75 T ≥ 1 T
> 0,2 mm ≥ 0,75 T ≥ 1 T

Etching profiles

biconvex biconcave depth etching convex spits



Connection tabs 

  • Etching takes place in sheets in which products can be configured both separately and with connection tabs.
  • It is preferable to etch with connection tabs: this is more efficient and gives a higher dimensional accuracy. Here you can choose between connecting and recessed connection tabs.



  • In addition, etching can take place separately if connection tabs are not an option. This is more laborious and gives a somewhat larger tolerance field.





Etchform happily provides you with a suitable offer. Please use our form to request a quotation.

Request quotation