CAS 7784-18-1 generally identifies aluminum sulfate octadecahydrate, also described as aluminum sulfate 18-hydrate. Its chemical formula is commonly written as Al2(SO4)3·18H2O, and its formula weight is approximately 666.43 g/mol. I recommend confirming the exact hydrate form, assay, appearance, packaging, and regulatory documentation before purchasing because commercial grades and regional descriptions can differ.
This guide explains what CAS 7784-18-1 is, where it may be used, which specifications matter, and how industrial buyers can evaluate a supplier. At Azeal Materials, we support B2B customers by aligning product documentation and supply arrangements with the intended application rather than treating every aluminum sulfate inquiry as the same requirement.
This guide is intended for procurement teams, chemical distributors, water-treatment companies, laboratory users, process engineers, and manufacturers evaluating CAS 7784-18-1. It is especially useful when a buyer has a CAS number but does not yet have a complete technical purchasing specification. The information can also help buyers compare quotations from different suppliers on a like-for-like basis.
CAS numbers identify chemical substances, but they do not by themselves define every commercial requirement. A purchase decision may also depend on hydrate state, aluminum content, sulfate content, insoluble matter, moisture behavior, particle form, packaging, and documentation. For regulated or sensitive applications, the buyer should also obtain and review the current SDS and Certificate of Analysis.
CAS 7784-18-1 is associated with a hydrated aluminum sulfate salt containing aluminum ions, sulfate ions, and crystallization water. The “octadecahydrate” designation indicates 18 water molecules are incorporated into the crystalline formula. This hydrate form should not automatically be treated as interchangeable with anhydrous aluminum sulfate or other aluminum sulfate hydrates.
The material is typically handled as an inorganic salt rather than as an organic solvent or polymer additive. When dissolved in water, aluminum sulfate produces an acidic solution and can undergo hydrolysis, which is relevant to coagulation and other process applications. Actual behavior depends on concentration, water chemistry, temperature, alkalinity, and the grade supplied.
| Parameter | Typical identification or purchasing reference |
|---|---|
| CAS number | 7784-18-1 |
| Common description | Aluminum sulfate octadecahydrate |
| Formula | Al2(SO4)3·18H2O |
| Hydration level | 18 water molecules per formula unit |
| Approximate formula weight | 666.43 g/mol |
| Physical form | Usually supplied as a crystalline or granular solid, subject to grade and processing |
The table provides an identity framework, not a substitute for a batch-specific specification. I advise buyers to check that the CAS number, product name, formula, and hydrate state on the quotation, label, SDS, and CoA are consistent. Any discrepancy should be resolved before order confirmation.
Aluminum sulfate is widely recognized as a coagulant used to destabilize suspended particles and assist floc formation in water-treatment processes. Its performance depends on dosage, pH, alkalinity, temperature, mixing conditions, and the characteristics of the untreated water. A jar test or process trial is therefore more reliable than selecting dosage from a general rule.
Buyers serving municipal, industrial, or process-water applications should pay attention to impurity limits and documentation requirements. The appropriate grade may differ depending on whether the material is intended for general industrial treatment, potable-water-related use, or a specialized process. I recommend stating the treatment application clearly when requesting a quotation.
Aluminum sulfate can be used in selected paper-processing, textile-processing, pigment, and other industrial formulations where aluminum and sulfate chemistry is required. The precise function may include aiding retention, influencing surface treatment, supporting precipitation, or adjusting process chemistry. These uses are application-specific, so the required assay and impurity profile should be agreed with the technical team.
It is not appropriate to assume that a general industrial grade is suitable for every end use. Paper, textile, laboratory, and water-treatment buyers may require different limits for insoluble material, iron, heavy metals, or other trace components. A supplier should evaluate the requested specification against the intended process rather than simply offering the lowest-cost material.
The first selection point is the hydrate form. CAS 7784-18-1 refers to a specific identity, so buyers should distinguish it from other aluminum sulfate entries that may have different hydration states or registry numbers. Physical form also matters because powder, crystals, and granules can behave differently during conveying, storage, dissolution, and dosing.
Buyers should also consider whether the product tends to cake under humidity or extended storage. Aluminum sulfate hydrates contain crystallization water, and storage conditions can influence handling behavior. I recommend requesting packaging guidance and a representative sample when the product will be fed through automated equipment.
Not every buyer needs every test. However, a clear specification prevents disputes caused by different calculation bases, such as reporting assay on an as-received basis versus a dry basis. If a limit is critical to your process, place it in the purchase specification instead of relying only on a general product name.
If you want to learn more, please visit our website Azeal Materials.
Start by describing what the material must do in your process. A water-treatment buyer may prioritize coagulation performance and impurity control, while a distributor may prioritize consistent documentation, packaging, and export readiness. A laboratory or formulation user may require smaller pack sizes and tighter identification control.
Confirm that the requested product is specifically CAS 7784-18-1 and aluminum sulfate octadecahydrate. Do not compare quotations only by the words “aluminum sulfate,” because different hydrates, concentrations, and commercial forms may be listed under similar descriptions. Ask suppliers to show the CAS number and formula on technical documents.
Separate essential requirements from preferences. Essential requirements might include assay, insoluble matter, a maximum iron level, or a defined particle size, while preferences may include color, bag style, or delivery location. This approach allows suppliers to quote accurately without adding unnecessary cost.
Review the SDS for hazard communication, storage, personal-protection, and incompatibility information. Aluminum sulfate solutions are acidic, and contact with incompatible materials or unsuitable equipment can create operational problems. Your technical and safety teams should approve the handling method before routine use.
The price of CAS 7784-18-1 can vary with assay, hydrate form, physical form, packaging, order quantity, destination, freight conditions, and documentation requirements. A quotation without a defined quantity and delivery location is usually indicative rather than final. Buyers should compare the delivered cost, not only the ex-works or unit price.
Minimum order quantity and lead time depend on available inventory, production scheduling, packaging format, and export arrangements. For a trial, I suggest asking whether a sample or smaller evaluation quantity is available before committing to a full commercial shipment. For recurring demand, provide an estimated annual volume and preferred delivery schedule so the supplier can propose a more realistic supply plan.
A reliable supplier should be able to identify the material clearly and provide documentation that matches the quoted product. I recommend checking whether the supplier can provide a current SDS, batch-specific CoA, packing information, and a defined quality specification. The supplier should also explain how it manages changes in raw materials, manufacturing location, packaging, or test methods when those changes could affect the product.
For international procurement, evaluate export experience, document accuracy, communication speed, and ability to coordinate freight and customs requirements. Do not treat a low price as proof of better value if the shipment has unclear specifications or inconsistent batch documentation. A short technical exchange before ordering can reduce the risk of receiving a product that is chemically similar but unsuitable for the intended process.
These mistakes are avoidable when the buyer uses a written specification and requests a document package before shipment. If the product is being introduced into a new process, I also recommend conducting a controlled trial and recording the operating conditions. Supplier data can support the decision, but process validation remains the buyer’s responsibility.
At Azeal Materials, we approach CAS 7784-18-1 as a technical sourcing project rather than a simple catalog transaction. We can discuss the required hydrate form, application, quantity, packaging, destination, and documentation before preparing a quotation. This helps us determine whether the requested material should be supplied as a standard grade or evaluated against additional customer specifications.
For qualified inquiries, we can coordinate product information such as the chemical identity, specification framework, SDS, CoA requirements, packing options, and shipment planning. Availability, MOQ, lead time, and final commercial terms must be confirmed for each order because they depend on the requested grade and logistics. We do not recommend using one specification for every application.
CAS 7784-18-1 is generally identified as aluminum sulfate octadecahydrate, a hydrated inorganic aluminum salt used in water treatment and selected industrial processes. The correct purchasing decision depends on more than the CAS number: buyers should confirm the hydrate form, technical limits, physical characteristics, documents, packaging, quantity, and destination. These details determine whether a quotation is genuinely comparable and suitable.
As a next step, prepare a short inquiry containing your required CAS number, end use, quantity, target specification, packaging preference, delivery location, and documentation needs. Send those details to Azeal Materials for a product and supply review. We can then help you evaluate the appropriate grade, request the relevant technical documents, and develop a practical quotation for CAS 7784-18-1.
If you are looking for more details, kindly visit CAS:7784-18-1.