A Gravimetric Determination of Insoluble Impurities and ash Impurities in Propellant-Grade Cellulose Nitrate

摘要

Mixed-solvent alkaline degradation of propellant-grade cellulose nitrate is used to allow gravimetric determinations of insoluble and ash impurities in 10-g samples. The need for such large samples is indicated by the nonhomogeneity of impure cellulose nitrate.nThe standard deviations of measurements for precision were found to be about O.O1% for both the insoluble and the ash im¬purities determination. Tests for accuracy showed standard deviations of 0.03% for the insoluble impurities and 0.01% for the ash impurities when evaluated over the range 0.0-0.6% impurities.