4,4'-Diamino-2,2'-stilbenedisulfonic acid Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 81-11-8 |
| Product name | 4,4'-Diamino-2,2'-stilbenedisulfonic acid |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Agricultural GradePharmaceutical GradeMaterial GradeSpecialty GradeReagent 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 4,4'-Diamino-2,2'-stilbenedisulfonic acid
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk 4,4'-Diamino-2,2'-stilbenedisulfonic acid Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of 4,4'-Diamino-2,2'-stilbenedisulfonic acid
| Industry | Application | Process |
|---|---|---|
| Dye Industry | Synthesis of azo dyes | Used as an intermediate in the synthesis of direct dyes, acid dyes, and other azo dyes |
| Pharmaceutical Industry | Pharmaceutical intermediate | Applied as a synthetic intermediate for certain anti-inflammatory and antimicrobial agents |
| Pesticide Industry | Pesticide synthesis | Applied as a synthetic intermediate for certain herbicides and fungicides |
| Chemical Industry | Other organic syntheses | Used as an amine-based reaction intermediate in organic synthesis |
| Research | Analytical reagent | Used as an analytical reagent or reference standard in laboratory applications |
Manufacturing Quality Control of 4,4'-Diamino-2,2'-stilbenedisulfonic acid
| Test Item | Common Testing Methods | Method Overview |
|---|---|---|
| Appearance | Visual Inspection | Observe the color and physical state of the sample under natural or standard lighting conditions to determine if it is a white or light yellow powder or crystalline substance. |
| Content Determination | High-Performance Liquid Chromatography (HPLC) | Uses a reversed-phase C18 column and a UV detector (typically at 254 nm or 280 nm) to quantify DSD acid content via external or internal standard methods. |
| Purity (Impurity Analysis) | High-Performance Liquid Chromatography (HPLC) | Separates the main component from impurity peaks using HPLC, calculates the area percentage of each impurity peak to evaluate total purity and identify major organic impurities (e.g., intermediates, oxidation products). |
| Moisture Content | Karl Fischer Titration | Quantitatively reacts KF reagent with water in the sample. Moisture content is determined by coulometric or volumetric methods, suitable for trace water detection. |
| Ignitable Residue (Sulfated Ash) | Gravimetric Method | Weighs the inorganic residue remaining after high-temperature incineration of the sample to assess inorganic impurity content, typically expressed as sulfated ash. |
| pH Value | pH Meter Method | Prepare a certain concentration (e.g., 1%) aqueous solution of DSD acid and measure its pH using a calibrated pH meter. |
| Water Insoluble Matter | Filtration-Drying-Weighing Method | Dissolve the sample in hot water, filter the solution, dry the residue, and weigh it to calculate the percentage of insoluble matter. |
| Heavy Metal Content | Atomic Absorption Spectroscopy (AAS) or ICP-MS | After sample digestion, determine the levels of heavy metals such as lead, mercury, cadmium, and chromium to ensure compliance with environmental and safety standards. |
| Chloride Content | Ion Chromatography or Argentometric Method | Determines chloride ion content either by ion chromatography or titration with silver nitrate. |
| Iron Content | Spectrophotometry or ICP-OES | Determines iron content by measuring the absorbance of a colored complex formed between iron and a chromogenic reagent (e.g., o-phenanthroline) at a specific wavelength, or directly by ICP-OES. |
Technical Specifications of 4,4'-Diamino-2,2'-stilbenedisulfonic acid
| Test Item | Specification |
|---|---|
| Appearance | Light yellow to brown crystalline powder |
| Purity | >=98.5% |
| Total Impurities | <=1.5% |
| Water Content (KF) | <=0.5% |
| Melting Point | 270–275 °C (decomposes) |
| Heavy Metals | <=20 ppm |
| Residue on Ignition | <=0.1% |
| Identification (NMR) | Conforms to reference standard |
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 4,4'-Diamino-2,2'-stilbenedisulfonic acid
| CAS/Product ID | *Required fields | |
| Lot/Batch Number | *Required fields | |
NMR Spectra of 4,4'-Diamino-2,2'-stilbenedisulfonic acid
Safety Information of 4,4'-Diamino-2,2'-stilbenedisulfonic acid
| Pictograms |  |
| Signal Word | Warning |
| Safety Data Sheet | |
Packaging of 4,4'-Diamino-2,2'-stilbenedisulfonic acid
Industrial 4,4'-Diamino-2,2'-stilbenedisulfonic acid 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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