The base
material used by Kelan in all of the
printed circuits manufactured
is glass fibre with epoxy resin (FR4),
with copper laminates of 17,
35 and 70 micrometres. Other materials
may be used if requested.
These standard circuits are finished
in 63/37selective tin/lead,
with a photosensitive mask and printing of components.
Graphite contacts may be used for
keys, peelable ink
and golden finishes for connectors.
The degree of complexity of a printed circuit
depends fundamentally on the number of layers,
,minimum drilling diameter,
the slot width and the seperation
between slots.
| |
Minimum drilling diameter |
Minimum corona for external layers |
Minimum corona for internal signal layers |
Minimum insulation for internal earth layers |
Minimum gap between the mask and pad |
Minimum conductor width |
Minimum space between conductors |
| Class 3(Simple face) |
0,7
mm.
0,028 inch. |
0,3
mm.
0,012 inch. |
N/A |
N/A |
0,25
mm.
0,010 inch. |
0,3
mm.
0,012 inch. |
0,
3 mm.
0,012 inch. |
| Class 4 |
0,5
mm.
0,020 inch. |
0,25
mm.
0,010 inch. |
0,30
mm.
0,012 inch. |
0,35
mm.
0,014 inch. |
0,2
mm.
0,008 inch. |
0,2
mm.
0,008 inch. |
0,2
mm.
0,008 inch. |
| Class 5 |
0,3
mm.
0,012 inch. |
0,2
mm.
0,008 inch. |
0,25
mm.
0,010 inch. |
0,3
mm.
0,012 inch. |
0,15
mm.
0,006 inch. |
0,15
mm.
0,006 inch. |
0,15
mm.
0,006 inch. |
The customer decides whether the circuits
are to be supplied as simple parts
or machine cut boards
or"scored" for mounting on
SMD component insertion equipment. METALIZED DUAL FACE
In FR4 with varying thicknesses of: 0.5;
0.8; 1.0; 1.2; 1.6; 2.0; 2.4 and 3.2 mm. The standard thickness is
1.6 mm.
MULTI-LAYERED
Up to 8 FR4 layers of thicknesses varying from
0.8 mm. to 2.0 mm depending on the
number of layers and their construction.
PROTOTYPES
Express manufacture of prototypes in
5 working days. |
