Description

Methyltetrahydrophthalic Anhydride is a versatile, low-viscosity liquid anhydride widely used as a curing agent and reactive intermediate. Its primary value lies in its ability to impart excellent thermal stability, chemical resistance, and mechanical properties to epoxy resin systems. This product is essential for manufacturers in the electronics, coatings, and composite materials industries seeking high-performance, durable thermoset polymers. The compound is identified by CAS NO 26590-20-5.

Application

• Epoxy Resin Curing Agent: Primary use for electrical laminates, potting compounds, and encapsulation materials in the electronics industry.
• Polymer Modification: Used as a reactive intermediate to synthesize polyester resins, alkyd resins, and plasticizers.
• Industrial Coatings: Formulation of high-performance, corrosion-resistant coatings for automotive, marine, and industrial equipment.
• Composite Materials: Curing agent for fiber-reinforced plastics (FRP) used in aerospace, wind energy, and automotive components.
• Adhesives and Sealants: Key component in formulating high-strength, heat-resistant structural adhesives.
• Chemical Synthesis: Building block for pharmaceuticals, agrochemicals, and other fine chemicals.

Basic Information

Product Name	Methyltetrahydrophthalic Anhydride
CAS No.	26590-20-5
Molecular Formula	C9H10O3
Molecular Weight	166.17 g/mol
Synonyms	4-Methyl-1,2,3,6-tetrahydrophthalic anhydride; Methyltetrahydrophthalic anhydride mixture of isomers; MTHPA; Methyl THPA; 4-Methyl-δ4-tetrahydrophthalic anhydride; Methyl-4-cyclohexene-1,2-dicarboxylic anhydride; NSC 9377
EINECS	247-835-0

Quality Control

Our Methyltetrahydrophthalic Anhydride is manufactured under a stringent quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets precise specifications for purity, viscosity, and acid value, guaranteeing consistent performance as a curing agent. Certificates of Analysis (COA) are provided with each shipment and are available upon request to support your quality assurance protocols.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, 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 performance.

Specification

Item	Specification
Appearance	Colorless to pale yellow liquid
Identification (IR)	Conforms
Assay (Anhydride Content)	≥ 98.0 %
Acid Value	650 - 680 mg KOH/g
Viscosity (25°C)	50 - 150 mPa·s
Color (Gardner)	≤ 2
Moisture (Karl Fischer)	≤ 0.1 %

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