Direct Black 38 Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 1937-37-7 |
| Product name | Direct Black 38 |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Industrial 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 Black 38
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk Direct Black 38 Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of Direct Black 38
| Industry | Application | Process |
|---|---|---|
| Textile dyeing and printing | Dyeing of cotton, viscose rayon, and their blends | Exhaust, jigger, or pad dyeing processes conducted in neutral or mildly acidic baths, using sodium sulfate (Glauber’s salt) as a leveling and exhausting agent |
| Textile dyeing and printing | Dyeing of silk and wool fabrics | Acetic acid bath dyeing process; requires precise control of acidity to ensure optimal exhaustion and color yield |
| Leather industry | Dyeing of chrome-tanned leather | Drum dyeing process for deep black shades, offering excellent penetration and strong dye-fiber bonding |
| Paper industry | Paper coloring | In-pulp dyeing process for producing black or dark-colored papers and paperboards |
| Biomedical/research | Histological staining | Counterstain in hematoxylin and eosin (H&E) staining, used for cytoplasmic and connective tissue visualization |
| Biomedical/research | Gel electrophoresis staining | Protein staining in polyacrylamide gel electrophoresis (PAGE), used for visualization of protein bands |
Manufacturing Quality Control of Direct Black 38
| Detection Item | Common Analytical Method | Method Overview |
|---|---|---|
| Assay (Dye Content) | UV-Vis Spectrophotometry | Quantifies dye concentration based on absorbance at characteristic wavelength using Beer-Lambert law. |
| Moisture Content | Karl Fischer Titration | Measures water content via stoichiometric iodine reaction with water in anhydrous methanol medium. |
| Ash Content | Gravimetric Analysis (Ignition at 550 C) | Determines inorganic residue after complete combustion of organic matter at high temperature. |
| pH (1% Aqueous Solution) | pH Meter Measurement | Measures hydrogen ion activity in aqueous solution using calibrated glass electrode system. |
| Heavy Metals (as Pb) | Atomic Absorption Spectroscopy (AAS) | Quantifies lead by measuring absorption of specific wavelength light by ground-state Pb atoms in flame. |
| Chloride Content | Potentiometric Titration with AgNO3 | Determines chloride via precipitation titration monitored by silver indicator electrode potential change. |
| Sulfate Content | Gravimetric Analysis (BaSO4 Precipitation) | Measures sulfate as insoluble barium sulfate after precipitation and drying to constant weight. |
| Water Solubility | Visual Inspection and Filtration | Evaluates completeness of dissolution in specified water volume under standardized temperature and agitation. |
| Color Strength (Relative) | UV-Vis Spectrophotometry | Compares absorbance of sample solution to certified reference standard under identical conditions. |
| Organic Impurities (Related Substances) | HPLC with UV Detection | Separates and quantifies structurally related compounds using reversed-phase chromatography and UV absorbance. |
| Particle Size Distribution | Laser Diffraction | Determines size distribution by analyzing angular variation in laser light scattering from dispersed particles. |
| Bulk Density | Graduated Cylinder Method (ASTM D1895) | Measures mass per unit volume of freely settled powder in a standardized cylinder under controlled conditions. |
Technical Specifications of Direct Black 38
| Test Item | Specification |
|---|---|
| Appearance | Black powder |
| Purity | >=98.5% |
| Water Content (KF) | <=0.5% |
| Total Impurities | <=1.5% |
| Single Impurity | <=0.3% |
| Heavy Metals | <=20 ppm |
| Residue on Ignition | <=0.2% |
| Solubility | Soluble in water with dark brown to black solution |
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 Black 38
| CAS/Product ID | *Required fields | |
| Lot/Batch Number | *Required fields | |
Packaging of Direct Black 38
Industrial Direct Black 38 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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