CAS 10043-01-3 · Primary Coagulant · NSF/ANSI 60 Available
Aluminum Sulfate
Al₂(SO₄)₃ · MW 594.32 g/mol · Filter Alum
Chemical & Filtration Products of Texas supplies aluminum sulfate — commonly known as alum — to water treatment facilities, municipalities, and industrial operations across Texas. Available in liquid solution and dry granular form, our alum is sourced from top-tier manufacturers and ships with full SDS documentation and lot traceability on every order. We serve facilities from Fort Worth to Houston, Dallas-Fort Worth, San Antonio, and Austin with drum, tote, and bulk tanker delivery options to match your volume requirements.
Formula
Al₂(SO₄)₃
pH (1%)
3.0–4.0
Effective pH
5.5–8.0
Form
Dry Granular / Liquid
Chemical Formula
Al³⁺ ions hydrolyze in water to form aluminum hydroxide floc that captures suspended particles
Safety & Regulatory
- NFPA Health
- 1 — Slight hazard
- NFPA Flammability
- 0 — Non-flammable
- NFPA Reactivity
- 0 — Stable
- OSHA PEL (Al dust)
- 15 mg/m³ (total)
- DOT Classification
- Not regulated (dry); Class 8 (liquid, high conc.)
- NSF/ANSI 60
- Certified grades available for potable water
- Incompatibilities
- Strong bases, strong oxidizers
- Special Note
- Acidic solution — corrosive to concrete over time
Grades & Packaging
Available Grades
Pack Sizes
Physical & Chemical Properties
| Molecular Formula | Al₂(SO₄)₃ · 14H₂O |
| Molecular Weight | 594.32 g/mol (hydrate) |
| CAS Number | 10043-01-3 |
| Physical Form | White/cream granules (dry) or colorless liquid |
| Melting Point | 86.5 °C (decomposes, hydrate) |
| Flash Point | Non-flammable |
| Density | 1.62 g/cm³ (dry); 1.33 g/cm³ (48% liquid) |
| pH (1% solution) | 3.0–4.0 |
| Solubility | 364 g/L at 20 °C |
| Effective pH Range | 5.5–8.0 (coagulation) |
| Aluminum Content | ~8.1% Al (dry granular) |
| Odor | Odorless |
Industrial Applications
Drinking Water Clarification
The most widely used coagulant in municipal water treatment — alum destabilizes colloidal particles and natural organic matter, forming settleable aluminum hydroxide floc. NSF/ANSI 60 certified grades are required for potable water applications.
Wastewater Treatment
Coagulant for removing suspended solids, turbidity, and phosphorus from municipal and industrial wastewater. Alum is particularly effective for phosphorus removal, achieving effluent levels below 0.1 mg/L when properly dosed.
Paper Manufacturing
Sizing agent and retention aid in paper production — alum precipitates rosin size onto cellulose fibers, improving water resistance. Also used as a drainage aid and to control pitch deposits in paper mills.
Soil Amendment
Acidifying agent for alkaline soils — alum lowers soil pH and provides available aluminum and sulfate. Used in horticulture for acid-loving plants and in turf management for pH correction.
Lake & Pond Management
Phosphorus inactivation treatment for eutrophic lakes — alum binds dissolved phosphorus in the water column and sediment, reducing algae growth and improving water clarity. Widely used in lake restoration programs.
Fire Retardant
Component of fire retardant formulations for wood and textiles — aluminum sulfate decomposes at elevated temperatures to release water and aluminum oxide, providing flame-retardant properties.
Why Source Alum from Texas-Chem?
- 35+ years supplying coagulants to Texas water utilities and industrial customers
- NSF/ANSI 60 certified grades for potable water treatment
- Dry granular and 48–50% liquid solution available
- Bags, super sacks, bulk dry, and tote delivery options
- Competitive pricing backed by top-tier producer relationships
- Same-day quotes for standard quantities