What Is CAS 7772-99-8? Chemical Identity, Specifications, and SDS

CAS 7772-99-8 needs exact identity verification before it is used to select, purchase, transport, or handle a chemical. Do not assume it identifies sodium thiosulfate: the commonly listed CAS number for anhydrous sodium thiosulfate is 7772-98-7, which differs by one digit. At Azeal Materials, we recommend matching the CAS number to the chemical name, formula, and current supplier SDS before approving a material. Without that match, product specifications and safety guidance cannot be reliably assigned to this identifier.

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Key points at a glance

• Confirm the identity associated with CAS 7772-99-8 against a current SDS and product documentation before ordering.
• Do not substitute a similar-looking CAS number or infer a chemical name from a near match.
• Request a specification, certificate of analysis (COA), and SDS for the exact product and grade being quoted.
• Use the verified SDS—not a generic description—to establish handling, storage, and transport requirements.

Chemical identity: why verification comes first

A CAS Registry Number is an identifier used to distinguish chemical substances. It is not a specification, a grade designation, or a guarantee that two products with similar names are interchangeable. A one-digit transcription error can point to a different record, so buyers should compare the complete number rather than relying on a partial match or a familiar product name.

Do not confuse it with sodium thiosulfate

Sodium thiosulfate is associated with CAS 7772-98-7 in its anhydrous form; its pentahydrate is commonly identified as CAS 10102-17-7. These numbers are not the same as CAS 7772-99-8. If a quotation, label, or web listing pairs 7772-99-8 with “sodium thiosulfate,” ask the supplier to resolve the discrepancy in writing before using the product.

For a dependable identity check, compare at least the CAS number, chemical name, molecular formula, and form stated in the product documentation. The SDS and COA should refer to the same product and grade as the quotation and packaging label. If those records conflict, pause purchasing and request corrected documents rather than guessing which field is accurate.

Functions and application considerations

A chemical’s role in a process depends on its verified identity, composition, grade, and relevant physical and chemical properties. Since the identity associated with CAS 7772-99-8 should be confirmed before assigning a chemical name, it would be unreliable to attribute specific functions or applications to this number alone. Buyers should first establish what substance is being offered, then assess whether its documented properties fit the intended process.

Match the verified material to the application

For industrial use, define the process requirement before requesting a quotation. Record the function the material must perform, any critical purity or impurity limits, the required physical form, and any restrictions on additives or moisture. Share those requirements with the supplier so that the proposed grade can be evaluated against an actual use case rather than a broad product label.

Application approval may also depend on local rules, workplace procedures, downstream product requirements, and transport classification. These factors should be checked using the documentation for the confirmed substance and the destination market. Do not rely on guidance written for a similarly named chemical or a neighboring CAS number.

Specifications to request from a supplier

There is no responsible way to assign a purity, appearance, solubility, or other product specification to CAS 7772-99-8 without first verifying the substance and the offered grade. Specifications can vary by manufacturer, production route, grade, and intended application. Ask for current, product-specific documents and confirm that their product identifier matches the item being quoted.

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Useful specification fields

• Identity: chemical name, CAS number, formula, and any relevant hydrate or physical-form designation.
• Assay: stated concentration or purity, with the measurement basis and test method where available.
• Impurities: limits for contaminants that matter to your process or finished product.
• Physical properties: the properties relevant to handling and use, supported by the supplier’s product documentation.
• Packaging: net mass, packaging material, closure, and any handling constraints.
• Lot documentation: batch or lot number and a COA that corresponds to the supplied material.

To make the units clear, a buyer’s draft specification might use fields such as assay in % w/w, moisture in % w/w, and net package mass in kg. For example, “assay ≥ 98.0% w/w,” “moisture ≤ 1.0% w/w,” and “25 kg net” are illustrative format examples only—not specifications for CAS 7772-99-8 or a claim about an Azeal Materials product. Set actual limits only after identity verification and technical review.

How to read the SDS

An SDS provides hazard, handling, emergency, and regulatory information for a specific substance or mixture. A standard SDS format contains 16 sections, covering topics such as identification, hazards, composition, first aid, firefighting, accidental release, handling and storage, exposure controls, physical and chemical properties, stability, toxicology, ecology, disposal, transport, regulatory information, and other information. Check that the SDS product name and identifier match the product label and quotation.

Practical SDS checks for B2B buyers

1. Compare the SDS identifier and product name with the quotation, label, and COA.
2. Review the hazard classification, required protective measures, and emergency instructions with your EHS team.
3. Check the storage and incompatibility information against your facility’s procedures.
4. Confirm that transport details and regulatory information are suitable for the shipment route and destination.
5. Ask the supplier for a current SDS in a language and format your receiving and compliance teams can use.

An SDS is not a substitute for a technical specification or a COA. It describes safety and related product information, while the specification defines acceptance criteria and the COA reports results for a particular lot when supplied. For controlled purchasing, keep these documents linked to the same product code and order record.

Buyer selection factors and supplier support

Before placing an order, confirm the material identity, grade, intended use, target specification, packaging, delivery destination, and documentation requirements. Ask whether the quoted product is a standard grade or a customized specification, and clarify what evidence is provided for each lot. If you need regulatory or application approval, state that early so the supplier can identify documentation gaps before the order is committed.

Azeal Materials supports B2B chemical sourcing by helping buyers clarify product requirements, review available specifications, and request relevant product documentation. We can discuss the required grade, volume, packaging, destination, and intended application as part of an inquiry. Product availability and document coverage must be confirmed for the exact material requested; no application suitability should be assumed from a CAS number alone.

Conclusion: verify before you specify or buy

The central answer is that CAS 7772-99-8 should not be treated as a confirmed chemical identity until it has been matched to reliable product documentation. In particular, do not confuse it with sodium thiosulfate, whose commonly listed anhydrous CAS number is 7772-98-7. The next step is to obtain a current SDS and specification, then check that the chemical name, CAS number, formula, grade, and product label agree.

For a sourcing review, send Azeal Materials the identifier as written, your required application, target specification, estimated quantity, packaging preference, and delivery destination. We can help clarify the inquiry and identify which product documents are needed before quotation or approval. If any identity detail remains inconsistent, resolve it before ordering, handling, or using the material.