Non-ferric Aluminum Sulfate CAS 10043-01-3
Non-ferric Aluminum Sulfate Enquiries
Non-ferric Aluminum Sulfate, also known as iron-free alum, is a commercial grade description; please specify the maximum iron content your application requires. Its molecular formula is Al₂(SO₄)₃·xH₂O, and its molecular weight is 342.15 (for the anhydrous form, Al₂(SO₄)₃). The grade name does not confirm zero iron or suitability for a sensitive application; review the proposed product specification and COA.
It appears as a white solid—in flake, granular, or powder form—or a colorless, transparent liquid. It has a specific gravity of 1.69, absorbs moisture easily, and can agglomerate. Its dehydration temperature is 86.5°C. The substance is soluble in water, acid, and alkali, but is insoluble in alcohol. An aqueous solution of non-ferric aluminum sulphate is acidic and has a characteristic flavor that is both acidic and astringent. When heated to 530°C, it begins to decompose, with the process completing at 860°C, leaving γ-Al₂O₃ as the final decomposition product.
Product Specification
Existing catalogue values below are reference information pending confirmation, not an agreed supply specification. Send your required content, impurity limits and reporting basis; confirm the actual product against its COA and SDS.
| Items | First Grade |
| Appearance | White Flake/Granular |
| AL2O3 % | ≥17.0 |
| Fe % | ≤0.005 |
| PH (1% solution) | ≥3.0 |
| Water insoluble % | ≤0.1 |
| Pb % | ≤0.001 |
| As % | ≤0.0004 |
| Hg % | ≤0.00002 |
| Cr % | ≤0.001 |
| Cd % | ≤0.0002 |
Applications of Non-ferric Aluminum Sulfate
Non-ferric aluminium sulfate is a versatile chemical used across various industries due to its effectiveness as a coagulant and flocculant. Its main applications include:
Water Treatment: Used as a primary coagulant in water purification and wastewater treatment to remove suspended particles, heavy metals, and phosphorus.
Paper Manufacturing: It functions as a sizing agent, a retention and drainage aid, and a filling and binding agent to improve the quality, brightness, and ink receptivity of paper.
Other Industrial Uses: It is also used in the processing of uranium dioxide, as a catalyst carrier, in fire-fighting foam, as a flame retardant for insulation materials, as a refractory additive, and as a raw material for artificial gems. Additionally, it's used in the textile industry as a mordant for dyeing and printing, in leather tanning, with any food-related application requiring separate product-specific suitability and documentation checks.
Packaging and Size
The forms and sizes illustrated below are catalogue references. Please state your preference; actual availability requires confirmation.
Related Articles
Purchase Enquiry Checklist
Please include the following in the existing inquiry form:
- Intended application and required physical form.
- Required maximum iron content, with units and reporting basis; required Al2O3/content, insolubles and other impurity limits.
- Quantity and unit; packaging preference.
- Destination port and any delivery requirements for review.
- Required documents, such as the product SDS, batch COA and any application-specific approvals.
Requested specifications, packaging, availability, delivery terms and documents are subject to confirmation for the proposed supply.
Drinking-water, food or other regulated-use suitability is not confirmed by this page and requires product-specific documentation.
To discuss these requirements, please contact us.
