... , papermakin, printing and dyeing pharmacy, soap, etc.Standard of identity: Caustic Solid GB209-2006.Details name of specification /gradesodium hyroxide by ... %≤0.0040.0060.0080.010.02Standard of identity of flaky caustic soda flakes: name of specification\ grademembrance processdiaphragrn processNaOH %≥9996.0Na2CO3 %≤1 ... %, 99%, etc 4. Appearance: Flakes, Pearl (white or light blue) Caustic Soda