Aluminium Sulfate octadecahydrate AR 500g CAS 7784-31-8
11701-500g

Specification: 

Assay............98.0%min.
Cl ................0.004% max
H.M (as Pb)...0.003 % max
NH4 ..............0.01 % max
As .................0.002 % max
Ca ................0.02 % max
Fe .................0.006 % max
K ..................0.2 % max

Conforms to BP

Formula Al2(SO4)3.18H2O
MWT= 666.45
CAS 7784-31-8