What Is CAS 135927-36-5? Chemical Identity and Supplier Specifications

CAS 135927-36-5 is identified in some commercial listings as polyvinylpyrrolidone, commonly abbreviated PVP and also known as povidone. PVP is a synthetic polymer used in applications such as binding, film formation, and solubilization. However, a CAS number alone does not specify the polymer grade, molecular-weight range, intended use, or pharmaceutical suitability. Before placing an order, we recommend confirming the product identity against the supplier’s current specification sheet, Safety Data Sheet (SDS), and, where applicable, Certificate of Analysis (CoA).

Read more

Key Takeaways

• CAS 135927-36-5 is associated in some commercial references with PVP or povidone; verify the mapping and substance description in the documents for the exact product offered.
• PVP is a polymer, so a single molecular weight does not describe every grade. Grade characteristics such as K-value, viscosity, and solubility matter when selecting a material.
• For pharmaceutical or other regulated applications, request evidence for the specific grade and intended market rather than relying on the words “PVP” or “pharmaceutical grade.”
• Compare suppliers using defined test methods, units, packaging, documentation, and change-control expectations—not the CAS number alone.

Chemical Identity and Core Functions

What the CAS number identifies

A Chemical Abstracts Service Registry Number is an identifier used to distinguish a substance in chemical information systems. It does not act as a product specification, quality certificate, or guarantee that two suppliers’ materials have identical performance. For a polymer such as PVP, commercial products can differ in properties even when they are described using the same general chemical name.

The PVP repeating unit is commonly represented by the formula C₆H₉NO, with a calculated molar mass of approximately 111.14 g/mol for that repeating unit. This value is not the molecular weight of a finished PVP polymer grade. PVP chains contain many repeating units, and the polymer’s molecular-weight distribution and related performance depend on the grade and manufacturing controls.

Why PVP is used

PVP is selected for functional properties that can include water solubility, film formation, and binding. In an application, these properties may support a formulation’s processing or product performance, but the result depends on the grade, concentration, other ingredients, and process conditions. We recommend evaluating the material in the intended formulation rather than assuming that all PVP grades are interchangeable.

Application Scenarios

PVP is used across several industrial and formulated-product settings. Depending on grade and applicable requirements, buyers may evaluate it for use as a binder, film-forming polymer, stabilizing or dispersing aid, or solubilizing component. These are functional categories, not confirmation that a particular grade is approved or suitable for every use.

In pharmaceutical excipient sourcing, buyers should identify the intended dosage form, process, market, and applicable compendial requirements before choosing a grade. A supplier’s general product description cannot by itself demonstrate compliance with a pharmacopoeia or regulatory requirement. Request supporting documents for the exact grade and batch, and have the responsible quality or regulatory team review them.

Types and Material Options

PVP is sold in different grades that can vary in viscosity behavior, K-value, molecular-weight characteristics, and other controlled properties. Some materials may be marketed for industrial applications, while others are offered for specific personal-care, food-related, or pharmaceutical uses, subject to the supplier’s documentation and relevant local rules. Product names and grade labels are not always directly comparable between manufacturers.

Do not treat PVP as interchangeable with every related material. For example, crosslinked povidone, often called crospovidone, is a distinct material with different functional behavior from soluble PVP. If your process depends on dissolution, swelling, binding, or a particular viscosity profile, state that requirement explicitly in the inquiry.

Key Supplier Specifications to Review

A useful specification sheet should identify the product and define the properties that matter to your application. For PVP, buyers commonly review identity, appearance, solubility, viscosity or K-value, moisture, residual components where relevant, and microbiological or other quality attributes when required by the intended use. The specific limits and test methods should come from the supplier’s controlled specification for the grade, not from a generic description.

With competitive price and timely delivery, NKY Group sincerely hope to be your supplier and partner.

The units shown above describe common ways to report specification attributes; they are not guaranteed values or limits for CAS 135927-36-5. Viscosity results are only comparable when the testing conditions and method are aligned. Likewise, a moisture result or assay value should be assessed against the grade’s agreed specification and the buyer’s requirements.

Buyer Selection Factors

Match the grade to the process

Start by documenting what the material must do in your formulation or manufacturing process. Specify the required physical form, dissolution behavior, viscosity range or method, and any other critical quality attributes. If you already use a reference grade, provide its full name and specification so the supplier can assess whether an offered alternative is technically comparable.

Confirm quality and regulatory documentation

Ask for a current SDS and product specification before qualification, then request a batch-specific CoA for each shipment where applicable. For regulated applications, clarify whether the supplier can provide the documentation your quality system requires, and verify the applicable market and compendial claims directly. Do not infer certification, compliance, or suitability from a marketing phrase unless it is supported by relevant documents.

Check supply details early

Confirm the available packaging, minimum order quantity, lead time, shipping conditions, and whether the supplier can support repeat orders with consistent documentation. These details can affect total procurement cost and production planning as much as the nominal price per kilogram. For a new material or source, consider whether your organization requires sample evaluation, supplier qualification, or a change-control review before commercial use.

Supplier Support from NKY Group

At NKY Group, we support B2B buyers by clarifying the product identity, grade requirements, and documentation needed for evaluation. To help us assess an inquiry efficiently, provide the CAS number, desired grade or benchmark product, intended application, target specification, and destination market. If the CAS number appears differently across your documents, include the product label or existing specification so we can identify the point that needs confirmation.

We can discuss available product information and the documentation relevant to your purchasing review. Any proposed grade should still be assessed against your internal quality requirements and the applicable rules for its intended use. Availability, packaging, and lead time should be confirmed for the specific order rather than assumed from a general product description.

Conclusion: What to Verify Before Buying

CAS 135927-36-5 is associated in some commercial listings with PVP or povidone, but the identifier alone is not enough to establish an exact grade or confirm suitability. The practical next step is to match the CAS number and chemical name across the label, SDS, specification sheet, and CoA, then review the grade-specific properties and test conditions. For pharmaceutical excipient procurement, confirm the relevant documentation and requirements for your market before qualification.

Send NKY Group your target grade, application, required specification, and destination market to begin a focused supplier review. This information helps us respond to the points that matter for your sourcing decision, including product identity, documentation, packaging, and order planning.