China Factory Direct
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| CAS number | 81-04-9 |
| Product name | 1,5-Naphthalenedisulfonic acid |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Pharmaceutical GradeIndustrial GradeSpecialty GradeReagent 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) |
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 |
|---|---|---|
| Textiles | Dye intermediates | Synthesis of reactive dyes via diazotization |
| Dyeing and Printing | Production of acid mordant dyes | Dye preparation via sulfonation and coupling reactions |
| Pharmaceuticals | Drug synthesis intermediates | Synthesis of antipyretic and analgesic agents |
| Analytical Chemistry | Spectrophotometric reagents | Preparation of colorimetric reagents or extractants |
| Consumer Chemicals | Fragrance synthesis intermediates | Sulfonated products used in condensation reactions |
| Detection Item | Common Analytical Method | Method Overview |
|---|---|---|
| Assay (Purity) | Acid-Base Titration | Quantifies 1,5-naphthalenedisulfonic acid content by neutralization with standardized NaOH solution using phenolphthalein indicator. |
| Moisture Content | Karl Fischer Titration | Determines water content via coulometric or volumetric titration based on the stoichiometric reaction of iodine with water in pyridine/methanol medium. |
| Residue on Ignition | Gravimetric Analysis | Measures non-volatile inorganic impurities by ignition at 700-800 C and weighing the residual ash. |
| Heavy Metals (as Pb) | Colorimetric Sulfide Precipitation | Detects heavy metals by formation of colored metal sulfide complexes under controlled pH after digestion. |
| Sulfate (SO4) Impurity | Barium Chloride Precipitation | Quantifies sulfate as insoluble BaSO4 precipitate formed in acidic medium, followed by gravimetric determination. |
| Chloride (Cl) Impurity | Silver Nitrate Titration | Determines chloride by precipitation with AgNO3 using potassium chromate indicator (Mohr method). |
| Iron (Fe) Content | Atomic Absorption Spectroscopy (AAS) | Measures iron concentration by quantifying absorbance of ground-state Fe atoms at 248.3 nm in acetylene-air flame. |
| pH of Aqueous Solution | Potentiometric Measurement | Determines hydrogen ion activity using calibrated glass electrode and reference electrode in a 1% w/v aqueous solution. |
| Organic Impurities (Related Substances) | High-Performance Liquid Chromatography (HPLC) | Separates and quantifies structurally related compounds (e.g., mono-sulfonated isomers, naphthalene) using reversed-phase C18 column and UV detection. |
| Melting Point | Capillary Melting Point Apparatus | Determines temperature range at which solid transitions to liquid, indicating purity and identity based on crystalline structure. |
| Sodium (Na) Content | Inductively Coupled Plasma Optical Emission Spectrometry (ICP-OES) | Quantifies sodium by measuring characteristic atomic emission intensity at 589.6 nm after acid digestion and plasma atomization. |
| Bulk Density | Graduated Cylinder Method | Measures mass per unit volume of freely settled powder using standardized tapping procedure per ASTM D1895. |
| Test Item | Specification |
|---|---|
| Appearance | Pale-yellow solid |
| Purity | >=98.0% (HPLC) |
| Water Content (KF) | <=0.5% |
| Melting Point | 230-235°C (decomposes) |
| Total Impurities | <=2.0% |
| Single Impurity | <=0.5% |
| Heavy Metals | <=10 ppm |
| Residue on Ignition | <=0.1% |
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| CAS/Product ID | *Required fields | |
| Lot/Batch Number | *Required fields | |
| Pictograms | ![]() |
| Signal Word | Danger |
| 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.