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SET JSC

1 "Hristo Botev" Blvd.

BG-7018  Rousse

Tel.: +359 82 88 66 00

Fax: +359 82 88 66 88

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Visitors: 5659482
 
Protective mask Print
Protective Photo-masks (PETERS)
TypeCharacteristics 
 Colour: 
ELPEMER SD2467SM-DGdark green 
ELPEMER SD2467SM-YGlight green (yellow-green) 
ELPEMER SD2497SM-SGwhite 
ELPEMER SD2457SM-SMblue 
ELPEMER SD2447SM-SMblack 
ELPEMER SD2437SM-DGred 
 Standard: IPC-SM-840C, Class H and T
Hardness7H
Permittivity93kV/mm
Surface resistance1014 W.cm
Internal resistance1016 W.cm
Epoxy mask (PETERS)
TypeCharacteristics 
 SD2468 NB-M/21Colour: 
green 
standardIPC-SM-840C Class H
Permittivity111kV/mm
Surface resistance1014 W.cm
Adhesion to Cuvery good
Adhesion to Sn/Pbvery good
Resistance to HALvery good
Protection during wave-solderingexcellent
 SD2494 NB-SMColour: 
white 
Standard  IPC-SM-840C, Class H
Permittivity111kV/mm
Surface resistance1014 W.cm
Adhesion to Cuvery good
Adhesion to Sn/Pbvery good
Resistance to HALvery good
Protection during wave-solderingvery good
UV mask (PETERS)
TypeCharacteristics 
 SD2368 UV-SM-DGColour 
green 
Standard  IPC-SM-840C, Class H
Permittivity103kV/mm
Surface resistance1014 W.cm
Adhesion to Cuexcellent
Adhesion to Sn/Pbvery good
Resistance to HALvery good
Protection during wave-solderingvery good

 

The protective mask covers the whole PCB surface except for the pads, on which either electronic components will be assembled, or the pads should remain uncovered for some other reason. The minimum spacing between the photomask and a pad is 0.1 mm, or 0.3mm if epoxy or UV mask is applied. Vias are filled in by epoxy mask (for example when the PCB is fixed by vacuum before testing after assembly). The below pictures shows the conditions, under which the vias can be filled in:

 

 
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