we have the best quality and price Caustic soda pearl is white spherical grain which is one of the basic ... chemical materials, and the high purity caustic soda pearl is the upgrade product of the solid caustic soda ... pearl.Testing result:NaOH: 99.4%, Na2CO3:0.27%, NaCl:0 ... medicine, food, rayon, petroleum and war industry etc. Caustic soda pearl