Technical specifications of grey board for spiral and parallel tubes
         
         
  MINIMUM   MAXIMUM
  Cenpa M4 Cenpa M5 Cenpa M4 Cenpa M5
Substance gr/m² 120 250 300 500
Bulk cm³/gr 1,57 1,3 1,57 1,57
Scott bond J/m² 230 200 300 700
Burst index kPa:gr/m² 1 0,8 1,80 1,80
Reel width in mm 60 70 2350 2450
Internal diameter in mm 70 76 200 152
External diameter in mm 800 1100 1400 1500
         
         
Working width 2.350mm 2.450mm    
         
M4=Machine 4        
M5=Machine 5