CAS 25655-41-8 is povidone-iodine, commonly abbreviated as PVP-I. It is a complex of iodine and povidone, also known as polyvinylpyrrolidone or PVP. Unlike simple elemental iodine, the povidone component helps carry and release iodine in a controlled manner, which is why PVP-I is widely used in antiseptic and disinfectant formulations. At Yuking, I help industrial and commercial buyers evaluate povidone-iodine by identity, available iodine content, physical form, application, documentation, and supply requirements.
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Povidone-iodine should not be treated as one completely uniform commercial material. Product performance can vary according to available iodine concentration, dosage form, formulation ingredients, packaging, and applicable market requirements. Buyers should therefore confirm the exact grade and specification before approving a supplier or using the material in a finished product.
CAS 25655-41-8 identifies povidone-iodine, an iodine complex formed with povidone. Povidone is a water-soluble polymer that can associate with iodine and help maintain iodine in a usable formulation. The iodine is the principal antimicrobial component, while the polymer influences solubility, handling, and release behavior.
Povidone-iodine is generally supplied as a brown to dark-brown solid, powder, or solution, depending on the commercial grade. Its color is related to iodine content and formulation conditions, but color alone is not sufficient for quality approval. I recommend reviewing the certificate of analysis, product specification, safety documentation, and intended-use requirements together.
The primary function of PVP-I is to provide available iodine in a water-compatible complex. When the formulation is diluted or applied, iodine can be released from the complex and contribute to antimicrobial activity. The actual performance depends on concentration, contact time, organic load, pH, temperature, formulation design, and the target market’s regulatory requirements.
A second function is formulation convenience. Compared with handling elemental iodine alone, a povidone-based complex is generally easier to incorporate into many aqueous products. The polymer can also support product stability and reduce some handling difficulties, although each formulation still requires compatibility and stability testing.
One of the most important purchasing points is the difference between product concentration and available iodine. A commonly marketed povidone-iodine grade is described as containing approximately 10% available iodine, but commercial specifications can differ and must be confirmed on the supplier’s documentation. The term “10% povidone-iodine” may refer to the concentration of the ingredient in a solution rather than 10% available iodine, so the wording should be checked carefully.
For procurement, I recommend asking whether the stated value refers to available iodine, iodine assay, or the concentration of a finished solution. This distinction affects dosage calculations, product labeling, cost comparisons, and regulatory review. It also prevents buyers from comparing two products that use different concentration conventions.
Povidone-iodine is commonly considered for topical antiseptic formulations, surgical or procedural preparation products, and certain healthcare-related disinfectant applications. It may also be used in veterinary and institutional products where iodine-based antimicrobial chemistry is appropriate. The final use must comply with the rules of the destination market and the product category.
In addition, PVP-I may be evaluated for laboratory, industrial, and specialty formulation work. These uses can require different controls for purity, trace metals, moisture, microbial quality, packaging, or solution stability. I do not recommend assuming that a material suitable for one application is automatically suitable for another.
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The correct specification depends on the application, but several parameters are important in nearly every technical review. Available iodine is usually the leading identity and performance parameter, while moisture, appearance, solubility, residue, and packaging affect processing and storage. I recommend requesting a current specification sheet and a batch-specific certificate of analysis before placing a production order.
| Specification Area | Why It Matters | Buyer Review Point |
|---|---|---|
| Available iodine | Indicates the usable iodine level in the material | Confirm the test method, target range, and whether the value is reported as a percentage |
| Appearance | Supports basic batch identification and handling inspection | Confirm whether the grade is powder, solid, or liquid and define acceptable color variation |
| Moisture or loss on drying | Can affect powder flow, weighing, storage, and formulation consistency | Request the specified limit and test method |
| Solubility | Influences processing and final product uniformity | Check the recommended solvent, temperature, concentration, and mixing conditions |
| Microbial and chemical controls | May be critical for healthcare, personal-care, or regulated applications | Define the required limits before supplier qualification |
Useful numerical information should always be read in context. For example, available iodine may be expressed as a percentage, moisture may be limited to a specified percentage, and shelf life may be stated in months under defined storage conditions. These figures are not interchangeable across suppliers, so I advise buyers to compare the full specification rather than one headline number.
The first distinction is between a solid PVP-I raw material and a pre-diluted solution. Solid material can provide greater flexibility for downstream formulation, while solution grades may reduce processing steps but increase shipping weight and impose additional storage considerations. The best choice depends on plant equipment, formulation concentration, order volume, and the buyer’s quality system.
A second distinction concerns application grade and documentation level. A buyer developing a regulated healthcare product may need more extensive analytical and traceability information than a buyer conducting laboratory screening. I can help organize the inquiry around the intended use without assuming that a single grade will meet every market’s requirements.
Iodine-containing materials should be protected from excessive heat, moisture, and incompatible chemicals. Packaging should be selected according to the physical form, transportation route, order quantity, and expected storage period. Buyers should follow the supplier’s safety data sheet and product-specific storage instructions rather than relying only on general chemical-handling practices.
Supplier selection should begin with identity confirmation: CAS 25655-41-8, product name, physical form, and available iodine specification. Next, I recommend confirming whether the supplier can provide a batch certificate, safety data sheet, packaging details, and samples for evaluation. These documents help the purchasing, technical, regulatory, and logistics teams review the same material consistently.
Supply continuity is also important for B2B buyers. Ask about normal pack sizes, minimum order quantity, production planning, export documentation, lead-time estimates, and the process for handling repeat orders. A supplier may offer a technically suitable material but still be a poor fit if communication, documentation, or delivery planning is unreliable.
CAS 25655-41-8 is the CAS identity for povidone-iodine, a widely used iodine complex for antiseptic, disinfectant, veterinary, laboratory, and specialty formulation applications. Its value comes from combining available iodine with a water-compatible povidone carrier, but the correct grade depends on concentration, physical form, formulation design, and compliance requirements. The most practical next step is to define your intended application and required available iodine range before comparing supplier quotations.
At Yuking, I support B2B buyers with product identification, specification review, sample coordination, packaging discussion, and export-oriented supply communication for CAS 25655-41-8. Send your target application, expected quantity, destination, and required documents so I can help you evaluate the appropriate povidone-iodine supply option.
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