1,2,3,6-Tetrahydrophthalic anhydride Bulk Supply for Industrial Use
China Factory Direct
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| CAS number | 85-43-8 |
| Product name | 1,2,3,6-Tetrahydrophthalic anhydride |
| Stock | Stock readily available; annual supply capacity exceeding 1,000 tons. |
| Grade | Pharmaceutical GradeMaterial GradeSpecialty GradeElectronic 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 1,2,3,6-Tetrahydrophthalic anhydride
Post-sale: Full documentation is provided.
To request documents, please contact us via email at sales@GRchemical.com.
Bulk 1,2,3,6-Tetrahydrophthalic anhydride Supplier from China
17+ years in chemical exports.Fully compliant, reliable supply.Your B2B partner in bulk chemical procurement.
Industrial Applications of 1,2,3,6-Tetrahydrophthalic anhydride
| Industry | Application | Process |
|---|---|---|
| Coatings & Resins | Used as a curing agent for epoxy resins to enhance thermal resistance, chemical resistance, and mechanical properties of coatings | Epoxy resins react with tetrahydrophthalic anhydride under heating to form a crosslinked network structure |
| Electronic Materials | Applied in packaging materials for printed circuit boards (PCBs) to improve insulation performance and thermal stability | Mixed with epoxy resins and shaped via compression molding or potting |
| Polymers | Used as a modifier for polyester resins to improve flexibility and water resistance | Incorporated into polyester synthesis via condensation polymerization with polyols and polycarboxylic acids |
| Pharmaceutical Intermediates | Used in synthesizing certain drug precursors, such as intermediates for anti-inflammatory agents and antibiotics | Functional groups are introduced via acylation or cyclization reactions |
| Adhesives | Used as a curing agent in high-performance adhesives to enhance bond strength and durability | Mixed with multifunctional resins and cured at elevated temperature to form robust adhesive layers |
Manufacturing Quality Control of 1,2,3,6-Tetrahydrophthalic anhydride
| Test Item | Common Test Method | Method Overview |
|---|---|---|
| Purity (Main Component Content) | Gas Chromatography (GC) | Capillary chromatographic column is used to separate sample components. The purity of THPA is calculated by determining the peak area of THPA using internal or external standard methods, suitable for analysis of volatile components. |
| Acid Value (Anhydride Content) | Titration Method (Potassium Hydroxide in Ethanol Solution) | The anhydride groups in the sample are titrated with a standardized potassium hydroxide ethanol solution using phenolphthalein as indicator. The acid value (mg KOH/g) is calculated based on the amount of alkali consumed, reflecting the content of active functional groups. |
| Moisture Content | Karl Fischer Method | Utilizes Karl Fischer reagent composed of iodine, sulfur dioxide, pyridine, and methanol, which reacts quantitatively with water. Moisture content at ppm levels is determined via potentiometric or coulometric titration. |
| Color (Appearance) | Colorimetric Method (APHA/Pt-Co Color Scale) | The sample is dissolved in a suitable solvent (e.g., toluene or ethyl acetate) and compared visually or instrumentally with standard platinum-cobalt color solutions. Results are expressed in APHA units to evaluate whether product color meets appearance specifications. |
| Melting Point | Melting Point Apparatus Method | A digital melting point apparatus is used to heat the sample gradually. The temperature range at which the sample transitions from solid to liquid is recorded. The typical melting point of THPA is 65–70°C, used for identification and preliminary purity assessment. |
| Impurities (e.g., Phthalic Anhydride) | High-Performance Liquid Chromatography (HPLC) | A C18 reversed-phase column is used with methanol/water or acetonitrile/water as mobile phase. Impurities such as residual unhydrogenated by-products are detected using a UV detector (210–230 nm) and quantified. |
| Heavy Metal Content | Atomic Absorption Spectroscopy (AAS) or ICP-MS | After ashing or acid digestion, the sample is analyzed by AAS or ICP-MS to determine concentrations of heavy metal ions such as lead, cadmium, and mercury, ensuring compliance with food- or pharmaceutical-grade safety standards. |
| Volatile Matter | Loss on Drying Method (e.g., GB/T 6283) | The sample is dried at a specified temperature (e.g., 105°C) until constant weight. The percentage of mass loss is calculated to assess levels of volatile impurities or residual solvents. |
| Cloud Point / Clarity | Transmittance Measurement (Spectrophotometer) | A solution of the sample at a defined concentration (e.g., 20% in toluene) is prepared, and transmittance is measured at a specific wavelength (e.g., 440 nm) to detect insoluble particles or gel-like impurities. |
| Chloride Content | Ion Chromatography (IC) or Silver Nitrate Titration | Following hydrolysis, chloride ion concentration is determined by ion chromatography, or by titration with silver nitrate standard solution forming silver chloride precipitate, to assess halogen impurity levels. |
Technical Specifications of 1,2,3,6-Tetrahydrophthalic anhydride
| Test Item | Specification |
|---|---|
| Appearance | White powder |
| Purity | ≥99.5 |
| Free acid | ≤0.3% |
| Volatile matter | ≤0.1% |
| Melting point | ≥100°C |
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 1,2,3,6-Tetrahydrophthalic anhydride
| CAS/Product ID | *Required fields | |
| Lot/Batch Number | *Required fields | |
NMR Spectra of 1,2,3,6-Tetrahydrophthalic anhydride
Safety Information of 1,2,3,6-Tetrahydrophthalic anhydride
| Pictograms |   |
| Signal Word | Danger |
| Safety Data Sheet | |
Packaging of 1,2,3,6-Tetrahydrophthalic anhydride
Industrial 1,2,3,6-Tetrahydrophthalic 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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