supply of nickel screens for centrifugal machnes supply of nickel screens for centrifugal machnes , pure nickel screen for nhec make nk-1100 / 30 continuous c / f machine chrome thickness 12 micron or above aperture 40 micron , opening area 6.5% or above size :- 0.06 × 0.30 or above × 2.09 mm or above. , opening area 4.2% or above size :- 0.04 × 0.30 or above × 2.09 mm or above. , pure nickel screen for nhec make nk-1503 / 30 continuous c / f machine chrome thickness 12 microns or above. aperture 40 micron , opening area 6.5% or above size- 0.06 × 0.30 or above × 2.09 mm or above , opening area 5.5% or above size- 0.05 × 0.30 or above × 2.09 mm or above , pure nickel screen for krupp make nk-1500 continuous c / f machine chrome thickness 12 microns or above. aperture 40 micron , opening area 6.5% or above size- 0.06 × 0.30 or above × 2.09 mm or above