—— Product Specifications ——

—— Product Detail ——

• • Product Overview

    Aluminum sulfate, commonly known as alum, is an inorganic salt with the molecular formula Al₂(SO₄)₃ and a molecular weight of 342.15 g/mol (anhydrous). This white crystalline powder or granules is one of the most widely used industrial chemicals globally, with the anhydrous form being highly hygroscopic and readily absorbing moisture from the air.

    Aluminum sulfate serves as a cornerstone chemical in water and wastewater treatment as a primary coagulant for removing suspended solids, turbidity, and phosphates. It is also extensively used in the paper industry as a sizing agent, in textile dyeing as a mordant, and in various other industrial applications including pH adjustment, catalyst preparation, and as a crosslinking agent in polymer chemistry.

    Synthetic Process

    Aluminum sulfate is manufactured through the following main routes:

    • Bauxite digestion method: Bauxite ore (containing aluminum hydroxide) is digested with concentrated sulfuric acid at elevated temperatures (100-150°C). The resulting solution is filtered to remove insoluble impurities, concentrated, and crystallized to obtain the product. A significant byproduct of this reaction is silica, which is removed by filtration.

    • Aluminum hydroxide method: High-purity aluminum hydroxide is reacted with sulfuric acid in a controlled exothermic reaction. This method yields a higher purity product suitable for reagent-grade applications.

    • Aluminum metal method: Metallic aluminum is dissolved in sulfuric acid, producing hydrogen gas and aluminum sulfate solution, which is then concentrated and crystallized.

    Mechanism of Action / Application Principles

    • Water Treatment Coagulation: When dissolved in water, aluminum sulfate hydrolyzes to form aluminum hydroxide [Al(OH)₃] flocs. These positively charged flocs neutralize the negative surface charges of suspended particles and colloids, causing them to agglomerate and settle. Optimal coagulation occurs at pH 6.0-7.5. The hydrolysis reaction is: Al₂(SO₄)₃ + 6H₂O → 2Al(OH)₃↓ + 3H₂SO₄

    • Paper Sizing: Aluminum sulfate reacts with rosin size to form insoluble aluminum resinate, which precipitates onto cellulose fibers. This hydrophobic coating improves paper's resistance to water penetration, enhances print quality, and increases sheet strength.

    • Textile Mordant: As a mordant, aluminum sulfate forms coordination complexes with natural dye molecules, fixing dyes to fibers and improving color fastness.

    • pH Adjustment and Crosslinking: Used as a pH adjuster in various processes and as a crosslinking agent for anionic polymers (e.g., polyacrylic acid) in hydrogel formation.

— C ompany Profile ——

Jinan Topfull Chemical Co., Ltd. is an international company rooted in China, specializing in the export of chemical products.

Our company is committed to making every effort to provide ideal chemical products to potential customers worldwide, including but not limited to: organic/inorganic reagents, biological reagents, plant extracts, pharmaceutical intermediates, active pharmaceutical ingredients (APIs), reference standards, reference substances, peptides, and more. Meanwhile, we have established long-term and stable cooperative relationships with university laboratories and off-campus research institutions, enabling us to offer tailored product services based on customers' actual needs.

We currently support customized services for most product categories, with supply quantities ranging from milligram (mg), gram (g) to kilogram (kg) levels, as well as wholesale. Product purity covers the full spectrum from 90% to 99.9%, providing customers with one-stop convenient services.

To date, our products have been exported to developed countries such as the United States, Australia, Canada, Mexico, as well as EU member states including France, Germany, and many other countries and regions such as Nigeria, Ghana, Southeast Asia, and other parts of Asia. Our product quality and services have consistently received high praise.

Looking ahead, our company will continue to serve as a bridge connecting China and the world, delivering high-quality products and services to global customers.

—— Q&A ——

Q1: How to confirm the product quality before placing orders?
A: By sending you available samples. Or if you have special requirements for the goods, we can prepare samples according to your requirements for confirmation.

Q2: Can you supply free samples?
A: Yes, we can provide a free sample, but the shipping cost will be paid by the customers. You can either pay the shipping cost or arrange a courier to collect the samples.

Q3: How do you treat quality complaints?
A: All our products are strictly tested by our QC and confirmed by QA; unqualified material will not be released to customers. If any quality problem is confirmed to be caused by us, we will replace the goods or refund your payment immediately.

Q4: What is your MOQ? Is there a discount?
A: For highvalue products, our MOQ starts from 1g and generally starts from 10g. For other lowprice products, our MOQ starts from 100g and 1kg.
Q: Is there a discount?
A: Yes, for larger quantities, we always support with better prices.

Q5: How to start orders or make payments?
A: You can send us your Purchase Order (if your company has one), or just send a simple confirmation by email or via Trade Manager. We will then send you a Proforma Invoice with our bank details for your confirmation, and you can make payment accordingly. If you have other preferred payment methods, we are open to discussion and negotiation.