ITEMS IS-IT-I STANDARD TESTIGN RESULT PREMIUM GRADE TOP-QUALITY GRADE QUALIFIED GRADE APPEARANCE WHITE, GLOSSY ELIGIBLE NAOH % MIN 99 98.5 98 98.6 NA2CO3% MAX 0.5 0.8 1.0 0.2 NACL % MAX 0.03 0.05 0.08 0.2 FE2O3 % MAX 0.005 0.008. 25 kg per bag,25 MT per 1*20 container.