Dear sir,
we produce high quality synthetic red iron oxide with specification as below :
Fe2O3% 98~99
Water Soluble Matter max. %            0.001
RetentionOn.045mm (325mesh)sieve, max. Approx.%                           0.15
Moisture Content%                     0.3
Oil Absorption(ml/100gms)ASTM D 1483     20~26
Apparent Density(gr/cm3)ASTM D 792       0.01
LossOn heating% ASTM D 3175           0.6
Particle shape                     Spherical
pH                                7
and so we can supply 2500mesh( less than 5um)
this product is best for painting usage
please feel free to contact us for more information and sample
my e-mail is  
thanks alot
soltani