The Molten Salt composition shall be 60% NaN03 and 40% KN03 (% by weight).

    The total content of impurities shall be that the purity of the sodium nitrate salt is equal or higher than 99.5%.

    The total content of impurities shall be that the purity of the potassium nitrate salt is equal or higher than 99.5%

    Regarding the granule size, 95% of particles shall be between 0.05 and 6 mm and particles greater than 6 mm will be removed prior to transport at site.