alpha-Naphtholphthalein Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 596-01-0 |
| Product name | alpha-Naphtholphthalein |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Industrial 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 alpha-Naphtholphthalein
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk alpha-Naphtholphthalein Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of alpha-Naphtholphthalein
| Industry | Application | Process |
|---|---|---|
| Chemical Analysis | pH Indicator | Used as a pH indicator in acid-base titrations, with a color transition range of approximately pH 8.0 (colorless) to 10.0 (red), suitable for endpoint detection under weakly alkaline conditions |
| Dye Industry | Organic Dye Intermediate | Applied in the synthesis of azo dyes and other naphthalene-based dyes via diazotization and coupling reactions to produce dyes with specific chromatic properties |
| Chemical Research | Analytical Reagent | Used as a colorimetric reagent for metal ions, participating in complexation reactions to detect or quantitatively determine certain metallic elements |
Manufacturing Quality Control of alpha-Naphtholphthalein
| Test Item | Common Testing Method | Method Overview |
|---|---|---|
| Appearance and Color | Visual Inspection | Observe the sample under natural light or standard light source to check if it is a yellow to orange-red crystalline powder, and whether there are any impurities, lumps, or discoloration. |
| Melting Point | Capillary Melting Point Determination | Load the sample into a capillary tube and use a melting point apparatus to determine the melting temperature range. The standard melting point is approximately 220–225 °C (literature value). |
| Purity (Main Component Content) | High-Performance Liquid Chromatography (HPLC) | Use a C18 chromatographic column with methanol/water or acetonitrile/water as the mobile phase, and a UV detector (λ≈270–290 nm) to quantitatively determine the content of 1-naphthol phthalein. Calculate purity using external standard method. |
| Impurity Analysis | HPLC-UV or HPLC-MS | Separate potential by-products (such as unreacted naphthol, phthalic anhydride derivatives, etc.) via gradient elution. Identify impurities by comparing retention time with standards or using mass spectrometry for structural identification. |
| Moisture Content | Karl Fischer Titration (KF Method) | Determine trace moisture in the sample using an iodine-sulfur dioxide-pyridine-methanol system. Control moisture content ≤0.5%. |
| Solubility | Solubility Test Method | Determine solubility in water, ethanol, acetone, and sodium hydroxide solution at 25 °C. Verify compliance with pharmacopoeia or enterprise standards (e.g., soluble in alkaline solutions and turns red). |
| pH Value (Solution) | pH Meter Method | Prepare a 0.1% aqueous solution or diluted alkaline solution, and measure the pH using a calibrated pH meter. 1-naphthol phthalein turns red in alkaline conditions, with a pH color change range of approximately 8.0–9.6. |
| UV-Visible Absorption Spectra | UV-Vis Spectrophotometry | Scan absorption spectra between 200–500 nm. Determine maximum absorption wavelength (λmax ≈ 275 nm, 350 nm, etc.), used for qualitative identification and quantitative analysis. |
| Loss on Ignition | High-Temperature Combustion Method | Heat the sample in a muffle furnace at 550 °C until constant weight. Measure residual inorganic matter content. Control loss on ignition ≤0.1%. |
| Heavy Metals | Atomic Absorption Spectroscopy (AAS) or ICP-MS | Dissolve the sample and measure the content of heavy metals such as lead, cadmium, mercury, and arsenic. Ensure compliance with pharmaceutical-grade standards (e.g., Pb ≤10 ppm). |
| Particle Size Distribution (Optional) | Laser Particle Size Analysis | Determine particle size distribution of the powder sample to ensure compliance with formulation process requirements (e.g., uniform dispersion when used as an indicator). |
Technical Specifications of alpha-Naphtholphthalein
| Test Item | Specification |
|---|---|
| Appearance | Light-green solid |
| Purity | >=98.0% (by LC-MS) |
| Melting Point | 176–179 °C |
| Total Impurities | <=2.0% |
| Water Content (KF) | <=0.5% |
| Heavy Metals | <=20 ppm |
| Residue on Ignition | <=0.1% |
| Identification (NMR) | Conforms to reference spectrum |
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 alpha-Naphtholphthalein
| CAS/Product ID | *Required fields | |
| Lot/Batch Number | *Required fields | |
NMR Spectra of alpha-Naphtholphthalein
Packaging of alpha-Naphtholphthalein
Industrial alpha-Naphtholphthalein 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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