Description

cis-1,2,3,6-Tetrahydrophthalic Anhydride is a versatile, reactive cyclic anhydride used as a key intermediate in the synthesis of high-performance polymers and specialty chemicals. Its saturated cyclohexene ring structure provides enhanced thermal stability and flexibility to the resulting materials, making it a valuable alternative to traditional aromatic anhydrides. This compound is essential for manufacturers in the epoxy resin, plasticizer, and corrosion inhibitor industries seeking to improve product performance and durability.

Application

• Epoxy Resin Curing Agent: Acts as a reactive intermediate for producing acid-cured epoxy systems with improved flexibility and thermal shock resistance.
• Polyester Resin Modifier: Used in the synthesis of unsaturated polyester resins for coatings, laminates, and fiber-reinforced plastics (FRP).
• Plasticizer Intermediate: Serves as a precursor for manufacturing specialty ester-based plasticizers, offering low volatility and good compatibility with PVC.
• Corrosion Inhibitor Synthesis: A key building block for creating high-efficiency corrosion inhibitors used in fuel and lubricant additives.
• Pharmaceutical Intermediate: Employed in the synthesis of certain active pharmaceutical ingredients (APIs) and fine chemicals.
• Alkyd Resins: Modifies alkyd resins for coatings, improving drying time, hardness, and chemical resistance.
• Crosslinking Agent: Functions as a crosslinker in polymer systems to enhance mechanical properties and thermal stability.
• Research & Development: Utilized in organic synthesis and material science research for developing novel polymers and additives.

Basic Information

Product Name	cis-1,2,3,6-Tetrahydrophthalic Anhydride
CAS No.	935-79-5
Molecular Formula	C8H8O3
Molecular Weight	152.15 g/mol
Synonyms	1,2,3,6-Tetrahydrophthalic anhydride; 4-Cyclohexene-1,2-dicarboxylic anhydride; cis-4-Cyclohexene-1,2-dicarboxylic anhydride; THPA; Tetrahydrophthalic anhydride; NSC 8652; 3a,4,7,7a-Tetrahydroisobenzofuran-1,3-dione
EINECS	213-308-1

Quality Control

Our cis-1,2,3,6-Tetrahydrophthalic Anhydride is manufactured under a stringent quality management system. Each batch undergoes comprehensive analytical testing to ensure it meets precise specifications for purity, identity, and physical properties. Certificates of Analysis (COA) documenting these results are available for every shipment to support your quality assurance and regulatory compliance needs.

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) and must be kept under dry conditions to prevent hydrolysis. Keep away from strong bases, amines, and oxidizing agents.

Specification

Item	Specification
Appearance	White to off-white crystalline solid
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0 %
Melting Point	98 - 102 °C
Water Content (KF)	≤ 0.5 %
Free Acid (as C8H8O4)	≤ 1.0 %

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