Direct Blue 71 Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 4399-55-7 |
| Product name | Direct Blue 71 |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Pharmaceutical GradeMaterial GradeSpecialty 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 Direct Blue 71
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk Direct Blue 71 Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of Direct Blue 71
| Industry | Application | Process |
|---|---|---|
| Textile Industry | Dyeing and printing of cellulosic fibers, such as cotton, linen, and viscose rayon | Direct dyeing in neutral or mildly alkaline aqueous solution, via immersion or pad dyeing |
| Paper Industry | Coloration of paper | Added during pulp processing or surface sizing to achieve uniform coloration via wet-end dyeing or coating dyeing |
| Leather Industry | Leather dyeing | Dyeing of light leathers (e.g., garment leather, glove leather) by direct dyeing in aqueous solution within a drum |
| Biotechnology/Laboratory | Tissue staining or electrophoresis indicator | Used as a biological sample stain or as a front-running indicator dye in gel electrophoresis (less common; requires specific conditions) |
Manufacturing Quality Control of Direct Blue 71
| Detection Item | Common Analytical Method | Method Overview |
|---|---|---|
| Assay (Dye Content) | UV-Vis Spectrophotometry | Quantifies dye concentration based on absorbance at lambda-max in standardized solvent, using molar absorptivity or calibration curve. |
| Moisture Content | Karl Fischer Titration | Determines water content via coulometric or volumetric titration with iodine-based reagent reacting stoichiometrically with water. |
| Inorganic Salt Content | Gravimetric Analysis | Precipitates and weighs insoluble inorganic residues (e.g., NaCl, Na2SO4) after solvent extraction and drying. |
| Heavy Metals (Pb, Cd, Hg, As) | ICP-OES | Simultaneously quantifies trace heavy metals after acid digestion by measuring element-specific atomic emission intensities. |
| pH of Aqueous Solution | Potentiometric pH Measurement | Measures hydrogen ion activity using calibrated glass electrode in 1% w/v aqueous dye solution. |
| Water Solubility | Visual Filtration and Clarity Assessment | Evaluates complete dissolution and absence of undissolved particles or haze in distilled water at specified temperature and concentration. |
| Substantivity (on Cotton) | Reflectance Spectrophotometry | Compares K/S values of dyed cotton fabric before and after standard soaping to assess fixation efficiency. |
| Chromatographic Purity | HPLC with UV Detection | Separates and quantifies main dye peak and impurities using reversed-phase C18 column and UV detection at 620 nm. |
| Ash Content | Gravimetric Ashing | Determines non-volatile residue mass after incineration at 550 C in muffle furnace, expressed as weight percent. |
| Particle Size Distribution | Laser Diffraction | Measures volume-weighted particle size distribution in aqueous dispersion using Mie scattering theory. |
| Organic Impurities (Related Substances) | TLC with Densitometry | Separates components on silica gel plate; identifies and semi-quantifies impurities by Rf values and spot intensity vs reference standard. |
| Sulfated Ash | Gravimetric Sulfated Ashing | Measures residual sulfate ash after sulfuric acid treatment and high-temperature ignition, indicating sulfate salt load. |
Technical Specifications of Direct Blue 71
| Test Item | Specification |
|---|---|
| Appearance | Dark brown powder |
| Purity | >=98.0% (dye content basis) |
| Total Impurities | <=2.0% |
| Water Content (KF) | <=0.5% |
| Heavy Metals | <=20 ppm |
| Residue on Ignition | <=0.3% |
| Solubility | Freely soluble in water; clear, blue solution |
| Color (APHA/Pt-Co) | Not applicable (solid) |
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 Direct Blue 71
| CAS/Product ID | *Required fields | |
| Lot/Batch Number | *Required fields | |
NMR Spectra of Direct Blue 71
Packaging of Direct Blue 71
Industrial Direct Blue 71 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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