Item        Specifications  
Zinc oxide% more than        99.7        99.5        99.0        95.0
Metal (zinc dollars)% less than        None        None        0.02        0.03
Lead oxide (as Pb)% less than        0.037        0.04        0.05        0.07
Copper oxide (copper dollars)% less than        0.0002        0.0004        0.0005        0.0007
Manganese oxide (in terms of manganese)% less than        0.0001        0.0001        0.0001        0.0001
Hydrochloric acid insoluble matter% less than        0.012        0.015        0.02        0.025
Loss on ignition% less than        0.2        0.2        0.2        0.2
Water-soluble matter% less than        0.1        0.2        0.3        0.5
105  volatile substances% less than        0.3        0.4        0.5        0.8
Specific surface area (m2 / g) more than        50        45        44        40
Sieve residue (um)        4-20        4-50        4-50