CAS 25655-41-8 Povidone-Iodine: Uses, Specifications, and Buying Guide

CAS 25655-41-8 identifies povidone-iodine (PVP-I), a complex of iodine and povidone used primarily as an antiseptic active ingredient. For B2B buyers, the key purchasing decision is not simply the product name: it is whether the grade, available-iodine content, documentation, packaging, and regulatory status match the intended application. We recommend confirming the target market and finished-product requirements before comparing quotations. This guide explains common uses, specification points, and practical supplier checks so you can prepare a more complete inquiry to NKY Group or another qualified supplier.

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Key Takeaways

• CAS 25655-41-8 refers to povidone-iodine, an iodine–povidone complex used in antiseptic products and related formulations.
• Available-iodine content is a critical grade attribute; a commonly referenced range for PVP-I raw material is 9–12% by weight, but buyers should verify the applicable monograph and supplier specification.
• Finished-product concentration and raw-material iodine content are different measurements and should not be treated as interchangeable.
• Before ordering, align grade, test methods, documents, packaging, destination-market requirements, quantity, and delivery expectations.

Who This Buying Guide Is For

This guide is intended for pharmaceutical and healthcare product manufacturers, procurement teams, distributors, and importers evaluating povidone-iodine as a raw material. It is also relevant to formulation and quality teams that need to translate a finished-product target into a supplier specification. The appropriate grade depends on the product category and applicable regulations, so this guide is not a substitute for a validated formulation or regulatory review. Buyers should confirm suitability with their quality and regulatory personnel.

What Is Povidone-Iodine?

Basic concept and function

Povidone-iodine is an iodine complex formed with povidone, also called polyvinylpyrrolidone (PVP). The complex serves as a carrier for iodine, which is the source of its antiseptic activity. PVP-I is commonly used in topical antiseptic preparations, although the permitted uses and product claims depend on the finished formulation and the market in which it is sold. It should not be assumed that one raw-material grade is suitable for every application.

CAS 25655-41-8 is associated with the complex rather than a simple small-molecule ingredient with one fixed molecular formula. As a result, buyers commonly assess the material using defined quality attributes, especially available iodine, rather than relying on CAS identity alone. A product label such as “povidone-iodine” also does not by itself establish its grade, purity, or regulatory acceptability. These details need to be confirmed in the current specification and supporting documents.

Common Uses and Application Matching

Typical application areas

Povidone-iodine is used in topical antiseptic products, including certain skin-preparation and wound-care formulations. Depending on local rules and the product design, it may also be used in other healthcare or institutional antiseptic products. The final application determines the required grade, formulation compatibility, labeling, and testing. Buyers should avoid selecting a raw material based only on a general application description.

Finished products may be supplied in different forms, such as solutions, ointments, or other formulated preparations. A commonly encountered formulation example is a 10% w/v povidone-iodine solution, often described as providing approximately 1% w/v available iodine; actual composition and labeling vary by product and market. This is a finished-product example, not a specification for the raw material. When discussing concentration, state whether you mean PVP-I content, available iodine, or another assay basis.

Matching the material to your project

For a regulated pharmaceutical or healthcare application, begin with the finished-product dossier, pharmacopoeial requirements, and destination-market rules. For a non-pharmaceutical use, establish the required technical properties and any restrictions that apply to the product category. In either case, confirm that the supplier’s grade and analytical methods align with your internal acceptance criteria. If you are changing suppliers or grade, assess the change through your established quality process.

Specifications Buyers Should Review

Core quality attributes

Available iodine is one of the most important specification items for povidone-iodine. A commonly referenced range for PVP-I raw material is 9–12% w/w available iodine, but the exact acceptance range depends on the applicable pharmacopoeia, grade, and buyer specification. Do not treat this range as a guarantee for every commercial product. Ask the supplier to identify the test method, reporting basis, and batch result shown on the certificate of analysis.

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Other attributes may include appearance, identification, assay or available-iodine result, moisture or loss on drying, pH where specified, and impurity or microbiological requirements where applicable. The relevant tests depend on the grade and governing standard, so not every item will apply to every purchase. Confirm whether results are reported on an “as is” or dried basis, where relevant. Clear alignment on methods and limits helps prevent disputes during incoming inspection.

Documents and packaging

Before placing an order, request the current product specification and a representative certificate of analysis, then confirm which documents will accompany the shipment. Depending on your market and quality system, you may also need a safety data sheet, origin information, manufacturing details, or other supplier declarations. Do not assume that a document is available or that it satisfies a specific regulatory requirement until it has been reviewed. Packaging should be assessed for product protection, handling, storage, labeling, and compatibility with your receiving process.

Selection Framework for B2B Buyers

1. Define the application. State whether the material is intended for a regulated finished product, a non-pharmaceutical product, or another use.
2. Set the grade and specification. Identify the governing standard, available-iodine range, test methods, and any additional acceptance criteria.
3. Check documentation and market fit. Confirm that the supplier can provide the documents your quality and regulatory teams require, and review local import or product rules.
4. Confirm commercial details. Request pricing by quantity, packaging options, minimum order quantity, production or dispatch timing, shipping terms, and quote validity.
5. Evaluate before scaling. Where appropriate, arrange a sample or qualification order and assess it through your normal incoming and formulation controls.

Pricing and lead time are quote-specific rather than fixed properties of CAS 25655-41-8. They may depend on grade, order volume, packaging, destination, documentation needs, and current supply conditions. Provide those details in the initial inquiry to help suppliers return a comparable quotation. If your project has a fixed launch date, ask the supplier to distinguish estimated production time from transit time.

Supplier Evaluation Checklist

Questions to ask before ordering

• Can you confirm the product identity, grade, available-iodine specification, and applicable test methods?
• Can you provide a current specification and a batch-specific certificate of analysis for the shipment?
• Which packaging formats, minimum order quantities, and order sizes are available for this grade?
• What is the estimated lead time, and what assumptions does that estimate include?
• Can the supplier support the documentation and shipping information required for your destination market?
• How are changes to specification, manufacturing, or documentation communicated to customers?

Compare suppliers on documented fit, not on price alone. A lower quotation may not be comparable if the grade, assay basis, packaging, or included documents differ. Ask for clarification when a specification uses a different test method or reports iodine on a different basis. Keep the approved specification and agreed commercial terms linked to the purchase order.

Common Buying Mistakes to Avoid

One frequent mistake is confusing the percentage of povidone-iodine in a finished product with the percentage of available iodine in the raw material. Another is requesting “pharmaceutical grade” without naming the applicable standard or the tests that matter for the project. Buyers can also overlook destination-market requirements, document review, or the need to qualify a material change. Defining these points before requesting prices makes supplier responses easier to evaluate.

How NKY Group Can Support Your Inquiry

At NKY Group, we can discuss your CAS 25655-41-8 sourcing requirements and help clarify the information needed for a product and commercial review. Share your intended application, target specification, required documents, destination, quantity, packaging preference, and requested delivery schedule. We can then assess the inquiry and confirm the relevant product and supply details available for your requirement. Final suitability should be determined against your approved specification and applicable regulations.

Conclusion and Next Steps

CAS 25655-41-8 identifies povidone-iodine, but the CAS number alone does not define the right grade for a purchase. Buyers should match the application to an agreed specification, verify available-iodine content and test methods, review documentation, and confirm MOQ, pricing, and lead time for the required destination. The commonly referenced 9–12% w/w available-iodine range is a useful point for discussion, not a substitute for the grade-specific specification. To request a quotation from NKY Group, prepare your target grade, required documents, quantity, packaging, destination, and delivery expectations.