- silk screen printing
- peel-off lacquer
- carbon prints with coating thickness ≥ 15 μm
For the various fields of applications, we generally use halogen-free solder resists.
Our classic standard coating is the green XV501 HF produced from the company ”Coates” which is cast on the PCB. For other coatings and colours we use a silk-screen printing method.
| Tolerances for luminous exposure: | ≤ 50 μm |
| Bridges between the SMD-pads depending on the final surface: | ≥ 80 μm |
| Plugging of PCBs with filling print without elevations: | up to 0.60 mm |
| Colour pallet: | green (standard) white, yellow, red, blue, black (matt and glossy) |
Carbon print: technical options, layout and tolerances
Carbon print: technical options, layout and tolerances
Carbon is used for keyboard contacts, LCD-contacts and contact plugs.
Due to the fact that carbon is applied via silk-screen printing, the precision is closely tied to the copper thickness. All following data are based on a CU-level of approximately 40 µm.
In order to realise the carbon print, the following layout requirements have to be taken into account:
| Layout requirements | |
|---|---|
| Carbon coating thickness: | 15-30 µm |
| Printing width min. (B): | ≥ 0.30 mm |
| Insulation distance carbon / carbon (K): | ≥ 0.30 mm |
| Insulation distance carbon / copper: | ≥ 0.30 mm |
| Overlapping carbon / copper (M): | ≥ 0.30 mm |
| Distance carbon / solder resist mask (R): | ≥ 0.30 mm |
| Overlapping carbon / solder resist mask: | ≥ 0.40 mm |
| Contour definition of the carbon: | ≤ 0.15 mm |
