Aluminum sulfate octadecahydrate
SIGALD/11044 - puriss., meets analytical specification of Ph. Eur., BP, 100-110%, 51.0-59.0% Al2(SO4)3 basis
Synonym: Aluminum sulfate hydrate
CAS Number: 7784-31-8
Empirical Formula (Hill Notation): Al2S3O12· 18H2O
Molecular Weight: 666.43
EC Number: 233-135-0
Linear Formula: Al2(SO4)3 · 18H2O
Product Type: Chemical
anion traces | chloride (Cl-): ≤50 mg/kg |
assay | 100-110% |
cation traces | As: ≤3 mg/kg |
Fe: ≤50 mg/kg | |
concentration | 51.0-59.0% Al2(SO4)3 |
form | crystals or chunks |
grade | puriss. |
impurities | residual solvents, complies |
≤0.002% heavy metals (as Pb) | |
≤0.003% ammonium (NH4) | |
≤0.2% sub.not precip.b.NH4OH(SO4) | |
InChI | 1S/2Al.3H2O4S.9H2O/c;;3*1 |
InChI key | KFCWRPFNNIEZRY-UHFFFAOYSA |
pH | 2.5-4.0 (20 °C, 2%) |
quality | meets analytical specification of Ph. Eur., BP |
Quality Level | 200 ![]() |
SMILES string | O=S(O)(O)=O.[AlH2][AlH2]. |
suitability | complies for appearance of solution |
Application: | Aluminum sulfate octadecahydrate is used: • As a trace water source in the synthesis of cancrinite zeolite from geophagic clay. • In the solvent free synthesis of ZSM-5 Zeolites from rice husk silica. • In the preparation of polymeric metal complex dyes. |
General description: | Aluminum sulfate octadecahydrate (Al2(SO4)3.18H2O) is a hydrated aluminum salt. It is used as a catalyst and cross-linker during chemical reactions. Aluminum sulfate octadecahydrate is also used as a coagulating agent/flocculating agent in the purification of drinking water and wastewater treatment plants. It is also used in the paper industry for sizing. |
Symbol | ![]() |
Signal word | Danger |
Hazard statements | H290 - H318 |
Precautionary statements | P280 - P305 + P351 + P338 + P310 |
Hazard Codes | Xi |
Risk Statements | 41 |
Safety Statements | 26-39 |
RIDADR | UN3260 - class 8 - PG 3 - RQ - Corrosive solid, acidic, inorgani |
WGK Germany | WGK 1 |
Flash Point(F) | Not applicable |
Flash Point(C) | Not applicable |
Purity | 100-110% |
UNSPSC | 12352300 |