4521-28-2 Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 4521-28-2 |
| Product name | 4521-28-2 |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Agricultural GradeIndustrial GradeSpecialty 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) |
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Documents We Provide for 4521-28-2
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk 4521-28-2 Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of 4521-28-2
| Industry | Application | Process |
|---|---|---|
| Pharmaceuticals | Used as a pharmaceutical intermediate in the synthesis of anti-inflammatory, antitumor, or neuroactive compounds | Integrated into target molecular structures via esterification, reduction, or coupling reactions |
| Pesticides | Used as an intermediate in the synthesis of novel herbicides or plant growth regulators | Coupled with heterocyclic amines via acid chloride formation or condensation reactions |
| Chemicals | Employed as a side-chain unit in the synthesis of liquid crystal materials or organic optoelectronic functional molecules | Extended conjugation systems via Grignard or Wittig reactions |
| Fragrances | Serves as a precursor for fragrance ingredients, used in formulating woody or musky odor profiles | Subjected to esterification followed by flavor-modifying reactions with alcohols |
Manufacturing Quality Control of 4521-28-2
| Detection Item | Common Analytical Method | Method Overview |
|---|---|---|
| Assay (Purity) | HPLC-UV | Quantitative determination using reverse-phase HPLC with UV detection at ~220–254 nm, comparing peak area against a certified reference standard. |
| Related Substances | HPLC-UV or UPLC-UV | Separation and quantification of structurally related impurities (e.g., starting materials, intermediates, degradation products) using gradient elution and UV detection. |
| Residual Solvents | GC-FID or GC-MS | Headspace GC analysis with flame ionization detection (or mass spectrometry) to quantify volatile organic solvents (e.g., methanol, THF, ethyl acetate) per ICH Q3C guidelines. |
| Heavy Metals | ICP-MS or AAS | Quantification of toxic elements (e.g., Pb, Cd, Hg, As) after acid digestion, based on USP <232>/<233> or ICH Q3D limits. |
| Water Content | Karl Fischer Titration | Volumetric or coulometric titration using iodine-based reagent to determine trace water content via stoichiometric reaction. |
| Acid Value | Acid-Base Titration | Neutralization of carboxylic acid groups with standardized NaOH solution using phenolphthalein or potentiometric endpoint detection. |
| Melting Point | Capillary Melting Point Apparatus | Determination of solid-to-liquid phase transition temperature range using calibrated capillary apparatus per USP <741>. |
| Appearance & Color | Visual Inspection / APHA Color Scale | Subjective assessment of crystalline form and color intensity against APHA standards in solution (e.g., 1% w/v in ethanol). |
| Residue on Ignition | Gravimetric Analysis | Measurement of inorganic ash content after high-temperature (600–800 °C) ignition of sample, per USP <281>. |
Technical Specifications of 4521-28-2
| Test Item | Specification |
|---|---|
| Appearance | Pale-yellow solid |
| Purity | >=98.0% (HPLC) |
| Melting Point | 75–79 °C |
| Water Content (KF) | <=0.5% |
| Total Impurities | <=2.0% |
| Single Impurity | <=0.5% |
| Heavy Metals | <=10 ppm |
| Acid Value (mg KOH/g) | 185–195 mg KOH/g |
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 4521-28-2
| CAS/Product ID | *Required fields | |
| Lot/Batch Number | *Required fields | |
NMR Spectra of 4521-28-2
Packaging of 4521-28-2
Industrial 4521-28-2 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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