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Fluorescent Brightener OB for Plastics, Coatings and Ink Applications, CAS 7128-64-5 sourcing visualProduct candidate for RFQ and specification verification
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Fluorescent Brightener OB for Plastics, Coatings and Ink Applications, CAS 7128-64-5

Fluorescent Brightener OB candidate for overseas buyers sourcing ink, coating and plastic additives. Key checks should focus on CAS 7128-64-5, assay or purity around 98.5% min, light yellow powder appearance, melting point range, volatile matter limit, mesh size, blue fluorescence/color description, packing format, export documents and shipment classification confirmation before RFQ placement.

Quick buying facts

Identify the grade, package, and import market before comparing suppliers.

Use this page to check the product identity, common specification points, document scope, package notes, and destination-market questions before sending a China sourcing request.

CAS No.: 7128-64-5Fluorescent whitening agent / optical brightener additiveProduct candidate for RFQ and specification verification
Request quoteOpen sourcing hub
Identity and grade

Typical specifications

  • CAS No.: 7128-64-5
  • Formula: C26H26N2O2S
  • Appearance: light yellow powder
  • Purity / content: ≥98.5% min as listed
  • Melting point: 201.0-205.0°C as listed
  • Volatile matter: ≤0.50% as listed
  • Mesh: ≥100 as listed
  • Color / fluorescence description: blue
  • HS Code listed: 3204200000
  • Reported applications: plastics, inks, coatings, paints, acrylics, polyester fibers, photographic paper
  • Reported compatibility examples: PVC, PE, PP, ABS, PS and other thermoplastic systems
Who uses this page

Target buyers

  • Ink additive importers
  • Plastic masterbatch manufacturers
  • Coating and paint additive distributors
  • Polymer compounding plants
  • PVC, PE, PP, ABS and PS processors
  • Industrial chemical traders
  • Textile and fiber auxiliary buyers
  • Specialty chemical formulators
Before matching

Documents to check

  • CAS number, grade, assay, and impurity profile
  • SDS, COA, TDS, HS code, and transport classification
  • Destination-market import documents before supplier matching
Package and route

Packing notes

  • Listed transport package includes 25 kg/drum, 10 kg/bag and 15 kg/bag in basic information.
  • Product text also mentions 50 kg, 200 kg or 1000 kg plastic drums, or special request packaging; confirm the actual export packing available for your order size.
  • Confirm inner liner, moisture protection, palletization, labeling language and container loading plan before purchase.
  • Confirm MOQ, sample availability, lead time and whether stock is located near Qingdao Port.
  • Ask whether export cartons, drums or bags are suitable for sea freight, air freight or courier sample shipment.
Applications and sourcing options

Check whether this product fits the buyer's actual application.

Clear application, grade, package, and document notes help separate real sourcing demand from a vague price check.

Use context

Common applications

  • Whitening and brightening additive for plastic masterbatches and filler masterbatches
  • Optical brightener for thermoplastic polymer systems such as PVC, PE, PP, ABS and PS
  • Brightness enhancer for industrial inks and coating formulations
  • Fluorescent whitening agent for paints, acrylics and related specialty coatings
  • Additive candidate for polyester fiber whitening applications where OB is technically approved by the buyer
How we compare

Sourcing options

  • Bulk RFQ for full-container or palletized export orders
  • Sample request for lab evaluation and shade/fluorescence comparison
  • COA-based batch approval prior to shipment
  • Private-label or buyer-specified packing subject to supplier confirmation
  • Port shipment via Qingdao or other agreed China export port
  • Specification-matched sourcing for Fluorescent Brightener OB CAS 7128-64-5
Human review

Compliance notes

  • Request current COA, SDS, TDS, specification sheet and packing list before order confirmation.
  • Verify CAS 7128-64-5 against your internal approved substance list and destination-market chemical inventory requirements.
  • Confirm dangerous goods classification, UN number status if applicable, transport restrictions and carrier acceptance before booking shipment.
  • Check whether the supplier can provide country-specific documentation such as certificate of origin, commercial invoice, bill of lading data, HS code support and customs declaration details.
  • Ask for impurity profile, residual solvent or volatile matter data, heavy metals statement if required for ink, coating or polymer applications.
  • Confirm whether the material is suitable for intended industrial use only and whether any food-contact, toy, textile or consumer-goods compliance documentation is required for your market.
  • No regulatory approval or import clearance should be assumed from the listing; buyer should validate local requirements independently.
Buyer search paths

Related sourcing terms

These terms support long-tail discovery while keeping the page focused on useful product and China export buying context.

Fluorescent Brightener OBOptical Brightener OBCAS 7128-64-5ink additive exporterplastic whitening agentfluorescent whitening agent for plasticsOB brightener for coatingsoptical brightener powderpolymer additive supplierHS Code 3204200000
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RFQ questions before supplier matching

Turn this product into a quote request.

Share target market, quantity, packaging scope, artwork status, delivery destination, and required documents so CHN Chemicals can prepare a cleaner supplier comparison.

Questions to confirm
  • Can you provide a recent batch COA showing purity/content, melting point, volatile matter, appearance and mesh size for CAS 7128-64-5?
  • Is the supplied product Fluorescent Brightener OB only, and are there any alternative grades, blends or substitutions?
  • What is the standard export grade and concentration, and can you confirm purity ≥98.5% min on every shipment?
  • What impurity limits are controlled, including volatile matter, insoluble matter, ash, heavy metals or residual solvents if tested?
  • Which packaging is available for export orders: 10 kg bag, 15 kg bag, 25 kg drum, 50 kg drum, 200 kg drum or 1000 kg package?
  • Can you provide SDS, TDS, COA, certificate of origin and sample documentation before bulk RFQ?
  • What is the MOQ, sample quantity, lead time and current stock availability near Qingdao Port?
  • What is the confirmed DG/non-DG transport classification for sea and air shipment?
Checks before quote
  • Request current COA, SDS, TDS, specification sheet and packing list before order confirmation.
  • Verify CAS 7128-64-5 against your internal approved substance list and destination-market chemical inventory requirements.
  • Confirm dangerous goods classification, UN number status if applicable, transport restrictions and carrier acceptance before booking shipment.
  • Check whether the supplier can provide country-specific documentation such as certificate of origin, commercial invoice, bill of lading data, HS code support and customs declaration details.
  • Ask for impurity profile, residual solvent or volatile matter data, heavy metals statement if required for ink, coating or polymer applications.
  • Confirm whether the material is suitable for intended industrial use only and whether any food-contact, toy, textile or consumer-goods compliance documentation is required for your market.
  • No regulatory approval or import clearance should be assumed from the listing; buyer should validate local requirements independently.
Next step

Send the product page with your target quantity and market. A sourcing manager can then confirm sample options, supplier fit, packaging details, and open document gaps.