Description

3,4,5,6-Tetrahydrophthalic Anhydride is a versatile, saturated cyclic anhydride used as a key intermediate in the synthesis of advanced polymers and fine chemicals. Its value lies in its reactivity as a bifunctional monomer, enabling the production of materials with enhanced thermal stability and chemical resistance. This product is essential for manufacturers in the epoxy resin, plasticizer, and specialty chemical industries seeking to develop high-performance coatings, adhesives, and composite materials.

Application

• Epoxy Resin Curing Agent: A core component for curing epoxy systems, imparting excellent heat resistance and mechanical properties to coatings and composites.
• Alkyd Resin Modifier: Used to modify alkyd resins, improving the drying time, hardness, and durability of industrial paints and varnishes.
• Polymer Intermediate: Serves as a monomer in the production of polyester resins and polyimides for high-temperature applications.
• Plasticizer Synthesis: An intermediate in the manufacture of specialty plasticizers, contributing to the flexibility and longevity of PVC and other polymers.
• Fine Chemical Synthesis: A building block for pharmaceuticals, agrochemicals, and other complex organic molecules requiring a saturated bicyclic structure.
• Corrosion Inhibitor Precursor: Used in formulations for creating effective corrosion inhibitors for metal treatment and cooling water systems.

Basic Information

Product Name	3,4,5,6-Tetrahydrophthalic Anhydride
CAS No.	2426-02-0
Molecular Formula	C8H8O3
Molecular Weight	152.15 g/mol
Synonyms	1,2,3,6-Tetrahydrophthalic Anhydride; 4-Cyclohexene-1,2-dicarboxylic Anhydride; δ4-Tetrahydrophthalic Anhydride; THPA; 3,4,5,6-Tetrahydro-1,3-isobenzofurandione; 4-Cyclohexene-cis-1,2-dicarboxylic Anhydride; NSC 8652
EINECS	219-371-7

Quality Control

Our 3,4,5,6-Tetrahydrophthalic Anhydride is produced under a stringent quality management system. Each batch undergoes rigorous analytical testing to ensure it meets precise specifications for purity, acidity, and melting point. Certificates of Analysis (COA) documenting these results are provided to guarantee supply consistency and traceability for your critical formulations.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This product is hygroscopic (moisture-sensitive); containers must be kept tightly sealed to prevent absorption of atmospheric moisture, which can affect product quality and handling.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (Titration)	≥ 98.0 %
Melting Point	98 - 102 °C
Free Acid (as Phthalic Acid)	≤ 1.0 %
Water Content (KF)	≤ 0.5 %

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.