... Papermaking, Soap Making, Artifical Fiber, Priting e High quality Caustic Soda Flakes, Pearls, Solid, mainly used in Papermaking, Soap Making, Artifical Fiber, ... .086%Fe2O30.005% max.0.004% ItemsStandardResultsNaOH FLAKES99% min.99.20%Na2CO30.8% max.0.78%NaCl0.08% max.0 ... bag with plastic inner.Solid: packing in 200kg and 250kg new steel drums.Loading: 25MT for one 20ft. container. Caustic Soda Flake