Povidone K25 is a medium-molecular-weight grade of polyvinylpyrrolidone, also called PVP or povidone, identified by CAS No. 9003-39-8. I typically see it selected as a water-soluble binder, solubilizer, film former, stabilizer, or processing aid in pharmaceutical, cosmetic, personal-care, and industrial formulations. For procurement, I recommend confirming the required grade, K-value range, molecular-weight profile, residual moisture, packaging, documentation, and intended regulatory market before placing an order.
This guide explains what Povidone K25 does, where it is used, which specifications matter, and how I would evaluate a supplier such as Yuking. Exact values can differ by manufacturing process, grade standard, and application, so buyers should use the supplier’s current technical data sheet and certificate of analysis as the final reference.
Povidone is a synthetic polymer produced from N-vinyl-2-pyrrolidone, and the “K25” designation describes a viscosity-related K-value rather than a simple percentage of active ingredient. In commercial practice, K25 is generally positioned between lower-viscosity grades such as K17 and higher-viscosity grades such as K30 or K90. The grade can therefore provide a balance between processability, binding performance, film formation, and solution viscosity.
Povidone is usually supplied as a white or nearly white powder and is widely recognized for its solubility in water and compatibility with many polar solvents. PubChem identifies povidone under Compound Identification information associated with CAS No. 9003-39-8, while regulatory acceptability depends on the application, dosage form, market, and applicable monograph. I recommend treating the chemical identity as only the first screening step because a correct CAS number does not by itself prove that a material meets pharmaceutical or cosmetic requirements.
For a current regulatory reference, I suggest checking the U.S. FDA Inactive Ingredient Database and the applicable USP–NF, Ph. Eur., or other recognized monograph. These sources help buyers assess whether povidone is listed for a particular route or dosage form, but they do not replace product-specific qualification or supplier documentation.
In wet granulation and related solid-dose processes, Povidone K25 can help improve particle cohesion and tablet mechanical strength. Its water solubility allows it to be prepared as a binder solution or incorporated through a dry process, depending on the formulation design. The final binder level must be established through development trials because excessive polymer can influence granule density, disintegration, dissolution, and compression behavior.
Povidone can interact with certain active ingredients and excipients to support more uniform distribution in aqueous or polar systems. It may also help reduce precipitation or improve physical stability in selected formulations, although the result depends on drug chemistry, concentration, pH, temperature, and processing conditions. I would not assume that K25 will solubilize every poorly soluble ingredient without compatibility and stability testing.
As a film-forming polymer, Povidone K25 may be used in coating, cosmetic, and personal-care applications where water dispersibility and adhesion are useful. Its moderate K-value can be considered when a buyer wants film-forming behavior without selecting a substantially higher-viscosity grade. Coating performance still depends on solids content, plasticizer selection, drying temperature, spray conditions, and substrate properties.
| Industry | Typical function | Important qualification point |
|---|---|---|
| Pharmaceuticals | Tablet binder, granulation aid, solubilizer, film former | Confirm compendial status, route suitability, residual limits, and change-control requirements |
| Cosmetics and personal care | Film former, stabilizer, texture modifier | Check local cosmetic regulations, odor, color, impurities, and microbial specifications |
| Industrial formulations | Dispersing aid, binder, protective colloid, processing additive | Evaluate compatibility, viscosity, drying behavior, and total cost in use |
| Technical research | Water-soluble polymer for formulation screening | Use a defined lot and retain samples for reproducibility |
The FDA Inactive Ingredient Database lists inactive ingredients by dosage form and route, making it a useful starting point for pharmaceutical formulation research. However, a listing does not automatically authorize a new product or establish that every commercial Povidone K25 grade is interchangeable. I recommend asking the supplier to map the proposed grade to your target market and to identify any gaps requiring your quality team’s review.
The K-value is the first specification most buyers associate with Povidone K25. A commonly referenced K25 range is approximately 22–28, but the exact acceptance range should be taken from the supplier’s current specification and test method. Because K-value is calculated from solution viscosity under defined conditions, buyers should compare results only when concentration, solvent, temperature, and analytical method are aligned.
| Specification area | What to request | Why it matters |
|---|---|---|
| Identity | CAS No. 9003-39-8, infrared identification, and product description | Confirms that the material matches the intended polymer |
| K-value | Target range, method, solvent, concentration, and temperature | Helps predict viscosity and processing behavior |
| Molecular-weight profile | Typical or controlled range, where available | Supports comparison between grades and lots |
| Water or loss on drying | Limit expressed in % or mg/g, with test method | Moisture can affect flow, stability, and granulation |
| Residue or ash | Maximum limit expressed in % | Provides information about inorganic residue |
| Microbiology | Total counts and specified-organism requirements, when applicable | Important for pharmaceutical, cosmetic, and personal-care uses |
| Packaging | Net weight, liner construction, outer bag, and pallet details | Supports warehouse planning and contamination control |
Some technical references describe Povidone K25 as having an apparent molecular-weight range near 28–34 kDa, but this figure should not be treated as a universal release specification. Polymer molecular weight can be reported by different analytical approaches, and the K-value is often more directly relevant to routine grade identification. For this reason, I recommend requesting both the nominal grade description and the actual lot-specific K-value on the CoA.
Link to Yuking
First, I identify whether the material will be used in a pharmaceutical dosage form, cosmetic product, industrial formulation, or laboratory process. This determines the documentation package, impurity controls, microbiological expectations, packaging, and change-notification requirements. A lower quotation may not be economical if the grade requires additional testing or cannot pass your internal qualification process.
I then compare the required solution concentration, mixing temperature, drying conditions, and target viscosity with the proposed K25 specification. If the formulation needs lower solution viscosity, a lower K-value grade may be more appropriate; if stronger film formation or higher viscosity is required, a higher grade may deserve evaluation. These decisions should be supported by bench-scale trials rather than by grade names alone.
For regulated applications, I would request a specification sheet, representative CoA, safety data sheet, allergen or GMO statement where relevant, residual-solvent information, and a written change-control policy. Depending on the market, buyers may also need documentation related to elemental impurities, nitrosamines, microbiological quality, or excipient compliance. The exact document list should be agreed by the buyer’s quality and regulatory teams before commercial approval.
Povidone is a powder, so packaging should protect it from moisture, contamination, and handling damage. I ask suppliers to state the standard pack size in kilograms, available pallet configuration, storage conditions, shelf-life basis, and recommended warehouse humidity controls. I also compare production capacity, backup arrangements, lot consistency, and communication speed because supply continuity can matter more than a small unit-price difference.
Povidone K25 pricing is influenced by grade level, documentation, order quantity, packaging format, destination, testing requirements, and delivery terms. I would avoid publishing a fixed price without a confirmed quantity and specification because the same product name can represent different quality packages and commercial conditions. Instead, buyers should request a quotation based on annual demand, trial quantity, target market, and required delivery window.
MOQ may vary by pack size, production schedule, and whether the buyer requests a standard or customized specification. For an initial evaluation, I suggest asking for a laboratory or pilot quantity that is large enough to complete formulation testing while preserving a sealed retain sample. Lead time should be confirmed in calendar days or working days, and the quotation should state whether it covers manufacturing, release testing, export documentation, and transport.
At Yuking, I would begin with the buyer’s application, target market, required specification, annual volume, and destination country before recommending a supply option. I can help organize a quotation around K-value, documentation, packaging, MOQ, and lead-time requirements rather than treating Povidone K25 as a one-size-fits-all commodity. Final suitability remains subject to the buyer’s formulation trials, quality approval, and applicable regulatory review.
One common mistake is selecting Povidone K25 only by the product name while ignoring the test method behind the K-value. Another is assuming that a general industrial grade can be used in a pharmaceutical or cosmetic product without additional qualification. Buyers also sometimes compare prices without including testing, documentation, packaging, freight, import duties, and the cost of requalification.
A further risk is failing to define acceptance criteria before the first shipment. I recommend agreeing on the specification, CoA format, sampling plan, retain-sample policy, packaging condition, and deviation procedure in writing. This creates a clearer basis for incoming inspection and reduces avoidable disputes between the buyer and supplier.
Povidone K25 is a practical medium-grade PVP option when a formulation needs water solubility, binding, film formation, solubilization, or stabilization with moderate viscosity behavior. It can be relevant to pharmaceutical, cosmetic, personal-care, industrial, and research applications, but the correct choice depends on the formulation and the required quality system. The K25 label alone is not enough to confirm interchangeability between suppliers.
My recommended next step is to prepare a short purchase specification covering application, target market, K-value, water limit, impurity requirements, packaging, quantity, and documentation. Send that specification to Yuking for a product-data review, sample or quotation discussion, and confirmation of available supply conditions. Before commercial use, complete your own compatibility, performance, stability, and regulatory qualification work.
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