2-Naphthol-6,8-disulfonic acid Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 118-32-1 |
| Product name | 2-Naphthol-6,8-disulfonic acid |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Material GradeSpecialty GradeIndustrial Grade |
| Packaging | 25L/drum200L/drum1000L/IBC |
| 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 2-Naphthol-6,8-disulfonic acid
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk 2-Naphthol-6,8-disulfonic acid Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of 2-Naphthol-6,8-disulfonic acid
| Industry | Application | Process |
|---|---|---|
| Dye Industry | Used as an intermediate for azo dyes and acid dyes, e.g., in the synthesis of C.I. Acid Blue 9 and C.I. Acid Black 1 | Diazotization-coupling reaction, coupled with aromatic amines or phenolic compounds |
| Textile Printing & Dyeing | Employed as a synthetic component for reactive dyes and metal-complex dyes to enhance color fastness and hue stability | Participates in dye molecule construction under alkaline or mildly acidic conditions, typically involving multi-step reactions such as sulfonation, coupling, and complexation |
| Paper Industry | Used as an intermediate for paper fluorescent whitening agents (e.g., certain stilbene-based whiteners) | Condensation with aldehydes to form conjugated structures, followed by sulfonation to introduce water-solubilizing groups |
| Organic Synthesis | Serves as a functional organic intermediate for producing naphthalene-based dispersants, corrosion inhibitors, and pharmaceutical intermediates | The sulfonic acid group participates in esterification, amidation, or salt formation to modulate molecular polarity and solubility |
Manufacturing Quality Control of 2-Naphthol-6,8-disulfonic acid
| Test Item | Common Testing Method | Method Overview |
|---|---|---|
| Appearance and Color | Visual Inspection | Examine the sample under natural or standard lighting; it should appear as white to light yellow crystalline powder, free from visible impurities or foreign matter. |
| Melting Point | Capillary Melting Point Apparatus | Determine the melting point range using a melting point apparatus. The typical value is 220–225°C (with decomposition), used for identity and purity assessment. |
| Assay (Main Component Purity) | High-Performance Liquid Chromatography (HPLC) | Use a C18 reversed-phase column with methanol/water or acetonitrile/water (containing buffer salts) as mobile phase. Detect at 254 nm using a UV detector. Quantify the main component by external standard method. High accuracy suitable for quantitative analysis. |
| Moisture Content | Karl Fischer Titration | Determine trace moisture content via iodine-sulfur dioxide-pyridine-methanol titration system. Accurately measures water content (typically required ≤1.0%). |
| Sulfate Impurity | Turbidimetric Method (Barium Sulfate Precipitation) | After acidifying the sample, add barium chloride to form barium sulfate precipitate. Compare turbidity with standard solutions to determine sulfate ion content and control inorganic impurities. |
| Heavy Metal Content | Atomic Absorption Spectroscopy (AAS) or ICP-MS | Sample is ashed or acid-digested, then analyzed by AAS or ICP-MS to determine levels of heavy metals such as lead, cadmium, mercury, and arsenic. Must comply with pharmacopoeial limits (e.g., ≤10 ppm). |
| Residual Starting Material (2-Naphthol) | HPLC or Thin-Layer Chromatography (TLC) | Detect residual 2-naphthol using HPLC or TLC, with UV detection or color-developing reagents (e.g., FeCl₃). Impurity level controlled to ≤0.5%. |
| Solubility | Physical Solubility Test | Test solubility in water, ethanol, acetone, etc., according to pharmacopoeial guidelines, confirming compliance with standard descriptions (e.g., freely soluble in water, slightly soluble in ethanol). |
| pH Value (Aqueous Solution) | pH Meter Method | Prepare a 1% aqueous solution and measure pH using a calibrated pH meter. Typical pH range is 3.0–5.0, reflecting the acidic nature of sulfonic acid groups. |
| Chloride Impurity | Silver Nitrate Titration (Potentiometric) | Acidify the sample solution with nitric acid, then titrate with standard silver nitrate solution. Endpoint determined by potentiometric detection. Chloride (Cl⁻) content controlled to ≤0.1%. |
| Residue on Ignition (Sulphated Ash) | Ignition and Gravimetric Method | Iignite the sample at high temperature (500–600°C) until constant weight, then weigh the residue. Inorganic residue controlled to ≤0.1%. |
Technical Specifications of 2-Naphthol-6,8-disulfonic acid
| Test Item | Specification |
|---|---|
| Appearance | White to off-white crystalline powder |
| Purity | >=98.5% |
| Water Content (KF) | <=0.5% |
| Melting Point | 220-225°C |
| Total Impurities | <=1.5% |
| Single Impurity | <=0.5% |
| Residue on Ignition | <=0.3% |
| Heavy Metals | <=20 ppm |
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 2-Naphthol-6,8-disulfonic acid
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| Lot/Batch Number | *Required fields | |
Packaging of 2-Naphthol-6,8-disulfonic acid
Industrial 2-Naphthol-6,8-disulfonic 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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