Makeup Egg,Spongebob Egg,Makeup Egg Sponge,Sponge Egg DONGGUAN YACAI COSMETICS CO.,LTD. , https://www.yacaicosmetic.com1,4-piperazine diethyl sulfonate sesqui-sodium salt; piperazine-N,N-bis(2-ethanesulfonic acid) CAS number: 100037-69-2C8H16.5N2Na1.5O6S2=335.34 grade: BR content: ≥ 99.0% heavy metal: ≤0.0001% Moisture: ≤0.5% trait: white powder. PH6.1-7.5; pKa6.7-6.9 (25 ° C), soluble in water use: biochemical research. Biological buffer preservation: RT