China Factory Direct
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| CAS number | 81-59-4 |
| Product name | 2,3-dihydro-1,4,5,8-tetrahydroxyanthraquinone |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Pharmaceutical GradeElectronic GradeMaterial GradeReagent Grade |
| Packaging | 25KG/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) |
Based on current marketvolatility and material availability.
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
| Industry | Application | Process |
|---|---|---|
| Dyes & Pigments | Intermediate for anthraquinone dyes, used in synthesizing high-performance dyes (e.g., disperse dyes, acid dyes) | Organic synthesis, coupling reactions |
| Pharmaceuticals | Precursor to active pharmaceutical ingredients (APIs) with potential anticancer or antibacterial activity | Modification of bioactive molecules |
| Chemical Research | Catalyst or electron acceptor in redox reactions | Laboratory synthesis, catalytic reactions |
| Electronic Materials | Synthesized into organic semiconductors or optoelectronic materials | Vacuum deposition, solution processing |
| Detection Item | Common Analytical Method | Method Overview |
|---|---|---|
| Assay (Purity) | HPLC-UV | Quantitative determination using reverse-phase HPLC with UV detection at 254 nm, comparing peak area against a certified reference standard. |
| Related Substances | HPLC-DAD | Separation and identification of impurities using HPLC coupled with diode-array detection, with spectral comparison and relative response factor correction. |
| Moisture Content | Karl Fischer Titration | Electrochemical titration using iodine generated in situ to react stoichiometrically with water in the sample. |
| Residue on Ignition | Gravimetric Analysis | Heating the sample at 700-800 C to constant weight and measuring inorganic residue as percentage of original mass. |
| Heavy Metals (as Pb) | AAS (Flame or Graphite Furnace) | Atomic absorption spectroscopy after acid digestion, measuring absorbance of characteristic wavelength for lead. |
| Chloride Impurity | Ion Chromatography | Separation of chloride ions on anion-exchange column with conductivity detection, quantified against calibration standards. |
| Sulfated Ash | Gravimetric Analysis | Sample treated with sulfuric acid and ignited at 600-700 C; residual sulfate ash measured gravimetrically. |
| Organic Volatile Impurities | GC-FID | Gas chromatographic separation followed by flame ionization detection, targeting common solvents per ICH Q3C guidelines. |
| Melting Point | Capillary Melting Point Apparatus | Thermal transition observed visually as solid-to-liquid phase change under controlled heating rate. |
| Loss on Drying | Thermogravimetric Analysis (TGA) | Mass loss measured upon heating under nitrogen or air up to 105 C, reported as percentage weight loss. |
| Specific Optical Rotation | Polarimetry | Measurement of rotation angle of plane-polarized light passing through a solution of known concentration and path length. |
| pH of Aqueous Suspension | pH Meter | Electrochemical measurement of hydrogen ion activity in a defined suspension (e.g., 1% w/v in water) at 25 C. |
| Test Item | Specification |
|---|---|
| Appearance | Dark Brown to Black Solid |
| Purity | >=98.0% (HPLC) |
| Melting Point | 245–249 °C |
| Total Impurities | <=2.0% |
| Single Impurity | <=0.5% |
| Water Content (KF) | <=0.5% |
| Residue on Ignition | <=0.3% |
| Heavy Metals | <=10 ppm |
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| CAS/Product ID | *Required fields | |
| Lot/Batch Number | *Required fields | |
| Pictograms | ![]() |
| Signal Word | Warning |
| Safety Data Sheet | |
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.