Diglycolic anhydride Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 4480-83-5 |
| Product name | Diglycolic anhydride |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Pharmaceutical GradeMaterial GradeSpecialty GradeIndustrial 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 Diglycolic anhydride
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk Diglycolic anhydride Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of Diglycolic anhydride
| Industry | Application | Process |
|---|---|---|
| Chemical Synthesis | Intermediate for synthesizing polyesters, polyurethanes, and other polymers | Used as a crosslinker or modifying monomer in condensation polymerization or esterification reactions |
| Resin Manufacturing | Modifying component in unsaturated polyester resins and alkyd resins | Copolymerized with polyacids or polyols to enhance resin flexibility and water resistance |
| Coatings Industry | Plasticizing modifier for coating resins to improve film adhesion and flexibility | Blended or copolymerized with acrylic, epoxy, or polyester systems |
| Adhesives Industry | Enhances adhesive bonding performance and weather resistance | Acts as an active diluent or crosslinking monomer in curing reactions |
| Pharmaceutical Intermediates | Structural building block for synthesizing certain pharmaceuticals or bioactive molecules | Incorporated into molecular frameworks via organic synthesis steps such as acylation or alkylation |
Manufacturing Quality Control of Diglycolic anhydride
| Test Item | Common Testing Method | Method Overview |
|---|---|---|
| Purity (Main Component Content) | Gas Chromatography (GC) | Utilizes a capillary column (e.g., DB-5 or HP-INNOWAX) with FID detection to measure the peak area of diethylene glycol anhydride or its main components. The content is calculated via external standard or internal standard method, suitable for quantification of volatile components. |
| Moisture Content | Karl Fischer Titration | Quantitatively determines trace moisture in samples through the reaction of iodine, sulfur dioxide, pyridine, and methanol. Capable of ppm-level accuracy, it is the gold standard for moisture determination in organic compounds. |
| Acid Value (Free Acid Content) | Acid-Base Titration | Titrate free acids in the sample using potassium hydroxide in ethanol solution with phenolphthalein as indicator. Acid value (mg KOH/g) is calculated to assess organic acid impurities formed by hydrolysis or degradation. |
| Hydroxyl Value (Hydroxyl Group Content) | Acylation Method (Acetic Anhydride-Pyridine Method) | Hydroxyl groups in the sample react with acetic anhydride to form acetate esters. Excess acetic anhydride is hydrolyzed, and the remaining acid is back-titrated with NaOH. Hydroxyl value (mg KOH/g) is calculated from the difference between blank and sample titrations, used to evaluate residual unreacted diethylene glycol. |
| Heavy Metal Content | Atomic Absorption Spectroscopy (AAS) or ICP-MS | After sample digestion, concentrations of lead, cadmium, mercury, arsenic, and other heavy metals are determined by AAS or ICP-MS. Results must comply with pharmacopoeial or ISO standard limits to ensure product safety. |
| Color (Appearance) | Platinum-Cobalt Colorimetric Method (APHA Color) | Compares the sample visually with standard platinum-cobalt solutions, expressed in Hazen units. Used to assess transparency and oxidation level, commonly applied in industrial raw material appearance control. |
| Boiling Point / Distillation Range | Distillation Method (GB/T 7534) | Determines the boiling range using a precision distillation apparatus to evaluate component purity and detect low- or high-boiling impurities, suitable for analysis of volatile substances. |
| Epoxy Value (if a glycidyl ether) | Hydrochloric Acid-Acetone Titration Method | Epoxide groups in the sample react with excess HCl; the remaining acid is back-titrated with NaOH. Epoxy value (eq/100g) is calculated, serving as a key quality parameter for evaluating the epoxy content in diethylene glycol diglycidyl ether. |
| Solvent Residue | Gas Chromatography-Mass Spectrometry (GC-MS) | Detects residual solvents (e.g., toluene, acetone, ethanol) from production processes. Qualitative identification by mass spectrometry and quantitative analysis by peak area, compliant with ICH Q3C guidelines on residual solvents. |
| Melting Point / Freezing Point | Melting Point Apparatus or Automatic Freezing Point Analyzer | Determines melting or freezing point to assess purity (pure substances exhibit narrow melting ranges), useful for preliminary purity evaluation of solid or highly viscous materials. |
| Viscosity | Rotational Viscometry (e.g., Brookfield) | Measures kinematic or dynamic viscosity at a constant temperature (e.g., 25°C). Used to evaluate batch-to-batch consistency, especially important in applications such as coatings and adhesives. |
Technical Specifications of Diglycolic anhydride
| Test Item | Specification |
|---|---|
| Appearance | White to almost white crystalline solid |
| Purity | >=98.0% (GC) |
| Water Content (KF) | <=0.5% |
| Total Impurities | <=2.0% |
| Single Impurity | <=0.5% |
| Acid Value (mg KOH/g) | <=1.0 |
| Melting Point | 65-69°C |
| Refractive Index (n20/D) | 1.452-1.456 |
| Relative Density (20°C/25°C) | 1.115-1.125 g/cm³ |
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 Diglycolic anhydride
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NMR Spectra of Diglycolic anhydride
Packaging of Diglycolic anhydride
Industrial Diglycolic anhydride 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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