CAS 25655-41-8: Properties, Uses, Safety, and Storage Guide

CAS 25655-41-8 identifies povidone-iodine, also known as iodopovidone, a complex of iodine and povidone used primarily as a topical antiseptic. It is supplied in several forms, including solutions, ointments, scrubs, powders, and other formulated preparations. Its practical value comes from the gradual release of iodine, while the povidone component helps maintain iodine in a water-compatible complex. At Yuking, I recommend confirming the exact grade, available iodine content, formulation, packaging, and regulatory requirements before placing a B2B order.

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Who This Guide Is For

This guide is intended for pharmaceutical ingredient buyers, medical and personal-care manufacturers, chemical distributors, formulators, and procurement teams evaluating CAS 25655-41-8. It is also useful for companies comparing bulk povidone-iodine materials with other iodine-based antiseptic systems. The information supports preliminary sourcing and technical review, but it does not replace the product-specific safety data sheet, certificate of analysis, or applicable local regulations.

Buyers should distinguish between the CAS number for the active complex and the commercial product they intend to purchase. A laboratory or industrial raw material may differ substantially from a finished 10% topical solution in concentration, excipients, viscosity, packaging, and permitted application. I recommend treating the CAS number as an identity starting point rather than as a complete product specification.

Basic Concept and Chemical Context

CAS 25655-41-8 is commonly associated with povidone-iodine, an iodine-containing complex formed with povidone, a water-soluble polymer. The complex is designed to provide a reservoir of iodine that can become available gradually in an aqueous environment. This differs from simple elemental iodine, which is more volatile and less convenient to formulate directly in many water-based products.

Commercial povidone-iodine is generally supplied as a dark brown to reddish-brown material or solution with an iodine-like odor. However, appearance can vary according to concentration, formulation, moisture content, and packaging. Exact physical and chemical values should always be checked against the supplier’s current technical data sheet and certificate of analysis.

Important Terminology

“Povidone-iodine” and “iodopovidone” are commonly used names for the same general complex. “Available iodine” refers to the iodine that can be released or measured as active iodine under a defined analytical method, while “total iodine” refers to the overall iodine associated with the material. These values are not interchangeable, so a purchasing specification should state which measurement is required.

Types, Forms, and Material Options

CAS 25655-41-8 may appear in different commercial forms depending on the intended application. A buyer may encounter concentrated raw material, aqueous solution, alcoholic solution, ointment, scrub, powder, or pre-formulated medical and personal-care products. These options are not automatically substitutable because each has different stability, compatibility, handling, and regulatory requirements.

One frequently encountered commercial reference is a 10% povidone-iodine topical solution, which may contain approximately 1% available iodine, or 10 mg/mL when expressed as an equivalent concentration. This relationship is formulation-dependent and should not be assumed for every CAS 25655-41-8 product. Buyers should request the exact assay basis, concentration range, and test method before comparing quotations.

Application Matching

The principal use of povidone-iodine is as an iodine-based antiseptic in topical and healthcare-related formulations. It may also be used in institutional hygiene products, laboratory preparations, veterinary products, and selected industrial or personal-care applications where the formulation and local rules permit. The final application determines whether the buyer needs a pharmaceutical-grade, cosmetic-oriented, technical, or finished-product material.

Healthcare and Topical Formulations

For healthcare-related products, the most important factors include identity, available iodine, microbial quality requirements, residual solvents where relevant, stability, and packaging integrity. Finished products must also meet the regulatory requirements of the target market, including labeling and permitted claims. A raw material supplier can provide technical documentation, but the finished-product manufacturer remains responsible for product qualification and legal compliance.

Personal Care and Hygiene Products

In personal-care or hygiene formulations, compatibility with surfactants, thickeners, fragrances, salts, and packaging materials requires practical testing. Povidone-iodine can affect color and may interact with reducing agents or other reactive ingredients. I recommend small-scale compatibility screening before approving a production-scale formula.

Key Selection Framework for Buyers

Start with the intended use, target market, and finished-product form. Then define the required available iodine range, assay method, moisture or solids specification, microbiological limits, packaging size, and shelf-life expectations. If the material will be used in a regulated product, request the relevant quality documents before commercial approval rather than after delivery.

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Specifications to Review

• CAS number and product identity
• Available iodine and total iodine, with analytical methods
• Appearance, odor, pH, moisture, and solubility or dispersibility
• Heavy metals, residual solvents, and other impurity limits where applicable
• Microbiological requirements for the intended application
• Packaging material, net weight, batch number, and retest or expiry information
• Storage conditions and transport restrictions stated on the SDS

There is no single universal specification for every product sold under CAS 25655-41-8. A technically suitable product for a non-sterile industrial formulation may not satisfy a pharmaceutical buyer’s requirements. For this reason, I advise procurement teams to compare complete specifications instead of comparing price per kilogram alone.

Safety and Handling Guidance

Povidone-iodine should be handled according to the supplier’s current SDS and the rules applicable in the country of use. Contact with the eyes can cause irritation, and repeated or prolonged skin exposure may also cause irritation or sensitization in some individuals. Operators should use suitable gloves, protective eyewear, protective clothing, and adequate ventilation based on the concentration and process conditions.

Concentrated materials and formulations should not be mixed casually with incompatible chemicals. Reducing agents, strong oxidizing agents, strong acids or bases, and reactive organic materials may require specific segregation or compatibility review. If a spill occurs, trained personnel should follow the site emergency procedure and avoid creating aerosols or spreading contaminated material.

Special Application Restrictions

Medical, veterinary, and consumer use requires more than chemical identity confirmation. Users should review label directions, contraindications, intended contact time, and restrictions for sensitive populations. Povidone-iodine products may require particular caution for people with iodine sensitivity, thyroid-related conditions, or other medical concerns, so healthcare use should follow the applicable professional and regulatory guidance.

Storage and Packaging

Store CAS 25655-41-8 in a tightly closed, correctly labeled container away from direct sunlight, excessive heat, moisture, and incompatible chemicals. Many iodine-containing products are light-sensitive, so opaque or light-protective packaging may be appropriate depending on the formulation. A controlled room-temperature range such as 15–30°C may be used only when supported by the supplier’s specification; the product label and SDS take priority.

Warehouse teams should use first-in, first-out inventory control and inspect containers for leakage, discoloration, damaged seals, or changes in consistency. Do not transfer the material into unmarked containers, because this can create identification and traceability risks. For international shipments, packaging, labeling, and transport classification should be confirmed before dispatch.

Pricing, MOQ, and Lead-Time Considerations

The price of CAS 25655-41-8 depends on grade, available iodine specification, physical form, packaging, order quantity, documentation, and destination. A raw material packed in drums or bags will not have the same cost structure as a ready-to-use solution packed in small containers. Minimum order quantities and lead times also vary according to stock status, production scheduling, export documentation, and required testing.

For a reliable quotation, I suggest providing the target specification, annual or trial quantity, packaging preference, delivery location, and intended application. Buyers should also clarify whether they require a sample, COA, SDS, technical data sheet, non-GMO or allergen statements, stability information, or other documents. These details help suppliers quote a comparable product and reduce avoidable revisions.

Supplier Evaluation Checklist

A capable supplier should be able to explain how the product is identified, tested, packed, stored, and released. Ask whether the quoted material is a raw complex or a finished formulation, and confirm the available iodine basis in writing. It is also useful to review batch traceability, complaint handling, export experience, and the supplier’s ability to support repeat orders.

1. Confirm CAS 25655-41-8 and the commercial product name.
2. Request the current specification, SDS, and representative COA.
3. Verify available iodine, assay method, appearance, and key impurity limits.
4. Check packaging, storage conditions, shelf life, and transport requirements.
5. Evaluate sample performance in the intended formulation.
6. Agree on MOQ, lead time, inspection terms, and document requirements.

At Yuking, I can support preliminary product matching for buyers in the alcohol, hydroxybenzene, and ether chemical sector while coordinating the technical details needed for a responsible quotation. Product availability, grade, packaging, and documentation should be confirmed for each inquiry rather than assumed. This approach helps align the material with the buyer’s application and compliance needs.

Summary and Next Steps

CAS 25655-41-8 is povidone-iodine, an iodine-povidone complex mainly selected for topical antiseptic and hygiene-related formulations. Its most important purchasing variables are available iodine, product form, application grade, impurity and microbiological limits, packaging, and storage stability. Commercial products that share the same CAS number may still differ significantly in concentration and suitability.

The next step is to prepare a clear purchase brief covering application, target market, required specification, quantity, packaging, and destination. Request the SDS, specification, COA, and sample where appropriate, then complete compatibility and regulatory review before production approval. Contact Yuking with these details to discuss a suitable CAS 25655-41-8 supply option and receive a quotation based on your actual requirements.

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