Bispyrithione

Bispyrithione for Industrial Antimicrobial Material Evaluation

Bispyrithione, also known as dipyrithione, is a pyrithione-derived compound supplied for industrial antimicrobial evaluation and specialty chemical development. Its suitability depends on the intended formulation, processing conditions, performance requirements and destination-market rules. Product identity and batch specifications should be confirmed before application testing or procurement.

• Defined identity: CAS No. 3696-28-4 helps distinguish this material from sodium, zinc and copper pyrithione.
• Specified content: The supplied specification lists a minimum content of 99%; the analytical method and batch result require confirmation.
• Application-led evaluation: Buyers should assess compatibility, antimicrobial performance and material properties in the intended system.
• Supply review: Quantity, packaging, documentation, sample availability and delivery requirements are confirmed for each inquiry.

Product Identity and Typical Specifications

The following information reflects the supplied product specification. Batch acceptance should follow the agreed specification and current Certificate of Analysis rather than website values alone.

Property	Supplied Specification or Identification
Product Name	Bispyrithione
Common Synonym	Dipyrithione
Other Names	Pyrithione disulfide; 2,2'-dithiobis(pyridine N-oxide)
CAS No.	3696-28-4
Molecular Formula	C10H8N2O2S2
Molecular Weight	252.31 g/mol
Appearance	White or off-white crystalline powder
Melting Point	203–205°C
Content	≥99%; analytical method to be confirmed against the current product specification
pH	5.5–6.9; reported for a 1% preparation in neutral distilled water. Preparation method and test temperature require confirmation.
Packaging	Available pack sizes and packaging materials to be confirmed for the order
MOQ and Lead Time	Subject to quantity, availability, packaging and destination

For the pH specification, buyers should confirm whether the test uses a solution, suspension or another defined preparation. Results should only be compared when sample preparation and measurement conditions are equivalent.

Bispyrithione Molecular Structure

What Matters Before Selecting This Material

Confirm the Compound Rather Than the Product Family

Bispyrithione is not interchangeable with other pyrithione derivatives merely because their names are similar. A purchasing specification should identify the exact compound and CAS number so that technical documents, samples and delivered material refer to the same substance.

• Identity check: Match the product name and CAS number across the quotation, specification, SDS and COA.
• Grade check: Confirm the intended industrial or development use rather than assuming cosmetic or pharmaceutical qualification.
• Substitution check: Evaluate any change from another pyrithione derivative as a material change requiring technical review.

Evaluate Antimicrobial Performance in the Intended System

Dipyrithione has reported antibacterial and antifungal activity, but that does not establish a guaranteed protection level in every material. Performance evaluation should address the organisms of concern, exposure conditions, formulation composition and the test method relevant to the finished product.

• Performance target: Define whether the project concerns fungal resistance, bacterial control or another specific requirement.
• Test conditions: Record the test organisms, exposure period, sample preparation and acceptance criteria.
• Material compatibility: Check whether the candidate affects appearance, odor, stability or other critical properties.
• Use level: Establish an appropriate level through application testing rather than transferring an unsupported dosage from another system.

Check Handling and Process Compatibility

The melting-point range alone does not establish an acceptable processing temperature or prove thermal stability. Buyers should review the current SDS and relevant technical information before defining storage, handling, mixing or heat-exposure conditions.

• Process review: Identify mixing temperature, maximum heat exposure, residence time and other formulation ingredients.
• Powder handling: Determine the ventilation, exposure controls and protective equipment required by the current SDS and site assessment.
• Storage review: Confirm container requirements and storage conditions from the product-specific documents.

Application Screening and Intended Buyers

The following are evaluation contexts rather than statements of universal suitability or regulatory approval. Each proposed use requires confirmation against the actual grade, test results and applicable market requirements.

Transparent Plastic and Polymer Development

Polymer formulators may review this material as a candidate for mildew-resistance development where the intended polymer system and processing conditions permit. For transparent plastics, optical quality must be evaluated alongside antimicrobial performance.

• Potential buyers: Polymer compounders, additive developers and specialty material laboratories.
• Key checks: Haze, color, visible particles, dispersion, processing compatibility and mechanical-property retention.
• Qualification requirement: Confirm performance on representative specimens prepared under documented conditions.

Specialty Chemical and Intermediate Evaluation

Chemical developers and qualified intermediates buyers may assess bispyrithione against their own process and analytical requirements. Suitability for a synthesis route depends on identity, content, relevant impurities and reaction compatibility.

• Potential buyers: Specialty chemical manufacturers, process-development teams and technical distributors.
• Key checks: Analytical method, impurity requirements, handling conditions and process-specific acceptance criteria.
• Grade limitation: Intermediate use does not establish pharmaceutical grade, medicinal suitability or an approved pesticide use.

Consumer-Product Proposals Require Separate Review

Historical references to cosmetics, deodorants or pharmaceutical applications should not be treated as approval for a new commercial use. Buyers proposing these applications need a separate assessment of the supplied grade, exposure conditions, safety information and destination-market requirements.

Packaging and Order-Specific Supply Requirements

Bispyrithione is presented here as a defined chemical material, not a product with automatically customizable composition. Zhufeng Chem can review requested supply arrangements, while nonstandard specifications or packaging remain subject to written confirmation.

• Packaging requests: State the preferred pack weight and any container or liner requirements for feasibility review.
• Labeling requests: Provide required label language and order references; mandatory safety and traceability information must remain compliant.
• Sample requests: Identify the evaluation quantity and destination so availability, charges and shipment arrangements can be confirmed.
• Documentation requests: Specify whether the inquiry requires a COA, TDS, SDS or additional product-specific declarations.
• Nonstandard requirements: Tighter content limits, additional testing or different physical forms require separate technical and commercial review.

Typical Procurement Example for Transparent Plastic Evaluation

This illustrative scenario describes a qualification approach for a transparent-plastic development project. It is not a reported customer transaction or a verified performance claim.

Buyer Requirement: A plastics developer considering a mildew-resistance additive would need to assess optical clarity and mechanical properties as well as biological performance. Before screening, the buyer would define the polymer grade, processing temperatures, sample quantity, optical acceptance limits and relevant fungal-resistance test.

Solution: In this scenario, Zhufeng Chem would first review the requested material identity, supplied specification and available documentation. Any sample supply would remain subject to confirmation. The developer would then prepare an untreated control and candidate formulations under comparable conditions, recording additive level, dispersion, haze, color, mechanical properties and test results.

Result: The intended outcome would be a documented decision on whether the candidate merits further development. No claim of improved mildew resistance, preserved transparency or production readiness could be made until the buyer completed the relevant tests. Pilot processing and final-market review would remain separate qualification steps.

Bispyrithione Questions for Technical Purchasing

Is bispyrithione the same as dipyrithione?

Dipyrithione is a synonym for bispyrithione, CAS No. 3696-28-4. Confirm the CAS number and current specification when comparing documents or alternative supply offers.

How is the minimum 99% content verified?

The supplied specification states a minimum content of 99%, but the analytical method has not been specified here. Buyers should confirm the method, acceptance criteria and batch result before approving the material.

Can it be used in transparent plastics without affecting clarity?

Clarity cannot be guaranteed from the raw-material specification. Evaluate haze, color, dispersion and visible particles in the intended polymer at the proposed use level and processing conditions.

Does the melting point define the maximum processing temperature?

No. Melting behavior and thermal stability are different properties. Processing suitability requires relevant thermal information and trials under the actual temperature and residence-time conditions.

Is this product approved for cosmetic or pharmaceutical use?

This page does not establish cosmetic authorization, pharmaceutical grade or medicinal approval. Any proposed use requires product-specific documentation and a review of the applicable destination-market requirements.

What are the MOQ, packaging options and delivery time?

Zhufeng Chem confirms these conditions against the requested quantity, available stock or production schedule, packaging and destination. No fixed MOQ or lead time is stated without order-specific confirmation.

Are samples and technical documents available?

Zhufeng Chem can review requests for evaluation samples and product-specific documents. Availability, sample quantity, charges, freight arrangements and document scope require confirmation for the requested material.

Zhufeng Chem and Pyrithione Product Support

Wuxi Zhufeng Fine Chemical Co., Ltd., established in 2004, develops and manufactures specialty chemicals including antimicrobial ingredients. For bispyrithione inquiries, Zhufeng Chem reviews the requested application, specification, documentation and supply arrangements to help buyers prepare their internal qualification process. Product availability and supporting documents are confirmed for the individual inquiry.

Prepare a Bispyrithione Product and Quotation Request

The following information helps Zhufeng Chem assess the requested material and prepare relevant supply details through the existing inquiry form:

• Intended application and any required analytical method or additional acceptance limits.
• Target order quantity, preferred packaging and required delivery timing.
• Destination country or port and any labeling requirements.
• Required documentation and whether an evaluation sample is needed.