Fluorescent Brightener 28 Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 4193-55-9 |
| Product name | Fluorescent Brightener 28 |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Industrial GradeMaterial GradeCosmetic GradeFood Grade |
| Packaging | 25KG/bag500KG/bag1000KG/bag |
| Sample | Test Samples Available (Click to Request Samples) |
| COA | View COA |
| Price | Get Quote |
| Supply Type | Bulk / Contract manufacturing / OEM |
| Shipping | FCL / LCL available |
| Payment Terms | Support FOB \ CIF \ EXW quotations, and accept Letter of Credit (L/C). |
| Manufacturer | Greenrock Chemical(China Factory) |
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Documents We Provide for Fluorescent Brightener 28
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk Fluorescent Brightener 28 Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of Fluorescent Brightener 28
| Industry | Application | Process |
|---|---|---|
| Textiles | Used for optical brightening of synthetic fibers such as polyester and nylon to enhance fabric whiteness and color vividness | Post-dyeing finishing or immersion process |
| Papermaking | Added to pulp or surface sizing to improve paper whiteness and visual brightness | In-pulp addition or coating process |
| Detergents | Acts as an optical brightener in laundry powders and liquid detergents to enhance post-wash whiteness of garments | Formulation blending |
| Plastics | Used for optical brightening of plastics such as PVC and ABS to counteract yellowing of the base material and improve product appearance | Melt compounding or injection molding |
| Cosmetics | Used in trace amounts in certain skin-whitening skincare products (subject to safety compliance) to deliver immediate visual brightening | Low-temperature emulsification or mixing process |
Manufacturing Quality Control of Fluorescent Brightener 28
| Detection Item | Common Analytical Method | Method Overview |
|---|---|---|
| Assay (Purity) | HPLC-UV | Quantitative determination using reverse-phase HPLC with UV detection at 345 nm, calibrated against certified reference standard. |
| Moisture Content | Karl Fischer Titration | Electrochemical titration measuring water content based on iodine-sulfur dioxide reaction in methanol-pyridine solvent system. |
| Ash Content | Gravimetric Analysis | Residue mass after incineration at 550 C in a muffle furnace, expressed as weight percent of original sample. |
| Heavy Metals (as Pb) | AAS (Flame or Graphite Furnace) | Atomic absorption spectroscopy measuring absorbance of ground-state atoms vaporized in flame or graphite tube. |
| Chloride Impurity | Potentiometric Titration | Titration with silver nitrate using silver indicator electrode; endpoint detected by potential change. |
| pH of Aqueous Suspension | pH Meter Measurement | Measurement of hydrogen ion activity in 1% w/v aqueous suspension using calibrated glass electrode pH meter. |
| Organic Volatile Impurities | GC-FID | Separation and quantification of residual solvents via gas chromatography with flame ionization detection. |
| Particle Size Distribution | Laser Diffraction | Analysis of scattered laser light intensity to determine volume-based particle size distribution in dispersed slurry. |
| Color Value (Yellowness Index) | Spectrophotometry (CIE Lab*) | Calculation of yellowness index from reflectance measurements at 400-700 nm using CIE 1931 standard observer. |
| Solubility in Water | Visual Inspection & Filtration | Assessment of complete dissolution in distilled water at 25 C followed by filtration through 0.45 um membrane to detect insoluble residue. |
| Bulk Density | Tap Density Measurement | Mass per unit volume after controlled tapping of sample in calibrated cylinder according to ASTM D1895. |
| Thermal Stability (Onset Temp) | TGA | Weight loss onset temperature determined by thermogravimetric analysis under nitrogen flow at 10 C/min heating rate. |
Technical Specifications of Fluorescent Brightener 28
| Test Item | Specification |
|---|---|
| Appearance | Yellow solid |
| Purity | >=98.5% |
| Total Impurities | <=1.5% |
| Single Impurity | <=0.3% |
| Water Content (KF) | <=0.5% |
| Melting Point | 218–222°C |
| Heavy Metals | <=20 ppm |
| Residue on Ignition | <=0.1% |
| Identification (IR) | Conforms to reference spectrum |
Specifications vary by industry. Reach out to our technical experts for a COA tailored specifically to your application. Email:selse@GRchemical.com
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Download COA of Fluorescent Brightener 28
| CAS/Product ID | *Required fields | |
| Lot/Batch Number | *Required fields | |
NMR Spectra of Fluorescent Brightener 28
Packaging of Fluorescent Brightener 28
Industrial Fluorescent Brightener 28 Procurement FAQ
1. How do you ensure product quality consistency?
We rely on a mature China-based manufacturing system and implement strict batch control and quality inspection for every shipment. Our production process complies with ISO 9001 standards, and a COA is provided for each batch to ensure consistent and reliable quality.
2. Do you offer competitive pricing for bulk orders?
Yes, as a China-based manufacturer and bulk supplier, we provide tiered pricing based on order volume. We support FOB and CIF quotations, as well as L/C payment terms for large transactions to meet international trade requirements.
3. Can you support large-volume or long-term supply?
We have stable production capacity and a well-established supply chain, enabling continuous bulk supply. We support ton-level and container-level orders, as well as long-term cooperation projects.
4. What is your typical lead time?
For in-stock products, shipment can be arranged within 1–3 days. For bulk packaging or customized orders, lead time depends on the specific quantity and production schedule.
5. What documents do you provide?
We can provide complete documentation upon request, including COA, SDS, TDS, and other compliance certificates, meeting industrial procurement and export requirements.
6. Can you customize product specifications or packaging?
Yes, we support customization of parameters such as purity, impurities, residual solvents, and heavy metals. We also offer various bulk packaging options, including 25kg bags, drums, and IBC tanks, suitable for industrial applications and transportation.
7. What shipping options do you support?
We support both FCL (Full Container Load) and LCL (Less than Container Load) shipments, and can flexibly arrange logistics solutions based on order size to meet bulk chemical export needs.
8. Do you provide technical or application support?
Yes, we provide basic application guidance and technical support based on industry experience to help customers optimize product usage.
9. How do you handle compliance and export regulations?
We are familiar with international trade and export regulations, ensuring all products comply with relevant requirements. We also provide complete documentation to support smooth customs clearance and global delivery.
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