Specification: F 52~53 % min Al 12~13% min Na 32~33% max Sio2 0.25~0.36% max Fe2o3 0.05~0.08% max So42- 0.6~1.0% max Cao 0.15~0.20% max P2o5 0.02~0.03% max H2o 0.20~0.40% max In 50kgs or 1000 kgs plastic woven bag lined with high-pressure plastic film, or according to customer's requirements.