Fluorescent Brightener OB-1 / FBA 393 CAS 1533-45-5 for Plastics Whitening
Buyer-facing sourcing candidate for Fluorescent Brightener OB-1, also referenced as FBA 393, CAS 1533-45-5, offered as a bright yellowish green powder for plastics and high-temperature polymer applications. Key RFQ checks should confirm CAS identity, assay basis, impurity profile, melting point range, appearance, application grade, export packing, COA/SDS readiness, and Bangladesh import documentation requirements.
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.: 1533-45-5Optical brightener / fluorescent whitening agent for plastics and polymer auxiliariesCandidate for RFQ after CAS, COA, impurity, packing, and export-document checks
Appearance: bright yellowish green crystalline powder
Purity: 98.5% min, supplier-stated and to be confirmed by COA
Melting point: 355-360 C, supplier-stated
Water solubility: insoluble in water, supplier-stated
Typical use grade: plastics auxiliary / fluorescent whitening agent
HS code shown by source: 32042000, to be verified against destination customs classification
Who uses this page
Target buyers
Plastic masterbatch manufacturers
Polymer additive distributors
PET, PP, PE, PVC, PS, and ABS processors
Textile and polyester fiber auxiliary buyers
Bangladesh chemical importers and industrial raw material traders
Compounders and color masterbatch producers
Coating, rubber, and plastics raw material sourcing teams
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
Source listing indicates 25 kg per drum, box, or bag.
Confirm final export packing type, liner material, sealing method, palletization, and container loading quantity before order.
Request photos of actual export packing and label format for the intended batch.
Confirm whether sample packing and commercial packing use the same specification and batch traceability.
Check if customized packaging is available for Bangladesh import, warehouse, and downstream repacking requirements.
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 of plastic products after grade compatibility testing
Polymer masterbatch formulation where high-temperature stability is required
Polyester fiber or polyester-cotton blend applications subject to buyer validation
Industrial additive sourcing for plastics processing and compounding
Replacement or qualification of existing OB-1 / FBA 393 supply sources
How we compare
Sourcing options
Request a pre-shipment sample with matching COA before commercial order.
Compare at least two supplier batches for color shade, fluorescence intensity, dispersion, and thermal stability.
Use third-party inspection or pre-shipment testing for first orders or new suppliers.
Ask for CIF/CFR Bangladesh and FOB China quotations to compare landed cost.
Confirm long-term supply capacity, batch consistency, and monthly allocation before committing to repeated purchases.
Human review
Compliance notes
Request current SDS, COA, TDS, packing list, commercial invoice, certificate of origin, and batch traceability documents before shipment.
Confirm DG status, UN classification if any, and carrier acceptance with the supplier and freight forwarder before booking.
Verify Bangladesh import requirements, HS code, labeling, and any chemical registration or customs documentation with a qualified local broker.
Do not rely on marketplace claims as regulatory confirmation; use batch documents and destination-country checks.
Confirm whether the material is intended for industrial use only and whether any food-contact, textile, toy, or consumer-goods restriction review is required for the buyer's application.
Ask supplier to disclose relevant impurities, heavy metals, residual solvents, and restricted substances according to buyer specifications.
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.
optical brightener OB-1 China exportfluorescent brightener 393 CAS 1533-45-5FBA 393 for plasticsOB-1 whitening agent for plastic masterbatchfluorescent whitening agent Bangladesh importCAS 1533-45-5 supplier Chinaoptical brightener for PET PP PE PVCHS code 32042000 optical brightener
Related product options
Build a broader quote package from adjacent options.
Buyers often compare neighboring grades, forms, or route options before sending one consolidated RFQ.
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 CAS 1533-45-5, assay, melting point, appearance, and test methods?
Is the quoted 98.5% min purity based on HPLC, GC, or another analytical method?
What are the controlled impurity limits, including ash, volatile matter, heavy metals, and residual solvents?
Can you confirm whether this grade is suitable for the buyer's target polymers such as PET, PP, PE, PVC, PS, ABS, or polyester fiber?
What is the recommended grade distinction between OB, OB-1, and FBA 393 in your product line?
Can you supply SDS, TDS, COA, certificate of origin, and export customs documents before shipment to Bangladesh?
What is the standard packing for export: 25 kg drum, carton, fiber drum, or bag, and is inner PE lining included?
What is the MOQ, sample availability, lead time, and validity period for Bangladesh export pricing?
Checks before quote
Request current SDS, COA, TDS, packing list, commercial invoice, certificate of origin, and batch traceability documents before shipment.
Confirm DG status, UN classification if any, and carrier acceptance with the supplier and freight forwarder before booking.
Verify Bangladesh import requirements, HS code, labeling, and any chemical registration or customs documentation with a qualified local broker.
Do not rely on marketplace claims as regulatory confirmation; use batch documents and destination-country checks.
Confirm whether the material is intended for industrial use only and whether any food-contact, textile, toy, or consumer-goods restriction review is required for the buyer's application.
Ask supplier to disclose relevant impurities, heavy metals, residual solvents, and restricted substances according to buyer specifications.
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.
