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Methyltetrahydrophthalic anhydride (MTHPA)

Methyltetrahydrophthalic anhydride (MTHPA) is an organic compound from the group of carboxylic acid anhydrides. The substance is an important hardener for epoxy resins and is used, among other things, in the production of coatings, adhesives and plastic components in the automotive and electronics industries. In addition, methyltetrahydrophthalic anhydride is used as a chemical intermediate in the production of methylhexahydrophthalic anhydride and other organic compounds. In large-scale processes, the substance is obtained from the reaction of isoprene with maleic anhydride.

At PENPET you get methyltetrahydrophthalic anhydride (MTHPA) of the highest quality - from a reliable partner who will also meet your requirements in the long term. We look forward to receiving your inquiry for an individual offer. Prompt delivery of the liquid compound can be made in packages with different weights.

CAS no. 11070-44-3
EINECS no. 247-830-1
Molecular formula: C9H10O3

Synonyms: 1,2,3,6-Tetrahydromethylphthalic Anhydride, MTHPSA, MTHPA, 3a-Methyl-3a,4,7,7a-tetrahydroisobenzofuran-1,3-dione, 7a-Methyl-4,7-dihydro-3aH-2-benzofuran-1,3-dione

Areas of application: Hardener for epoxy resins, intermediate for syntheses in organic chemistry


More Information

Methyltetrahydrophthalic anhydride (MTHPA) is a doubly cyclic compound. Molecules of the substance consist of an incompletely hydrogenated phenyl ring, which has a monounsaturated character, and a second cyclic component, which is formed by the dehydrated combination of two carboxyl groups attached to the phenyl radical. In addition, methyltetrahydrophthalic anhydride has a methyl group. This can be attached to different carbon atoms of the substance, so that there are several isomers of the compound.

Under normal conditions, methyltetrahydrophthalic anhydride (MTHPA) is a viscous, oily liquid with a slightly yellowish tinge. The compound reaches its boiling point when heated to 120 °C.

Methyltetrahydrophthalic anhydride is soluble in water with hydrolysis. The compound is also readily soluble in many organic solvents such as chloroform, benzene, ethanol, toluene, acetone, carbon tetrachloride and ethyl acetate.

When stored as intended, methyltetrahydrophthalic anhydride (MTHPSA) is a chemically very stable compound. However, the substance is moisture sensitive and hydrolyzes in water. Explosive peroxides can form in air. Contact with strong oxidizing agents also threatens dangerous reactions with a violent course.

Methyltetrahydrophthalic anhydride is flammable but difficult to ignite. Combustion of the compound produces toxic gases such as carbon monoxide and carbon dioxide.

Methyltetrahydrophthalic anhydride (MTHPA) is an irritant hazardous substance that poses acute and chronic health hazards. On the skin, the compound can cause redness, painful irritation, allergic reactions and permanent sensitization. Wetted parts of the body should be rinsed thoroughly with water and examined by a doctor if the symptoms persist. The substance can cause chemical burns and severe damage to the cornea. After thorough rinsing of the affected eye under running water, immediate ophthalmological treatment must be arranged.

Inhaling the vapors and aerosols of the substance is irritating to the respiratory tract and can cause coughing, breathing difficulties, asthma-like symptoms and allergic reactions. After absorption of the compound into the metabolism, central nervous system disorders such as drowsiness and sleepiness may occur. If poisoning is suspected, medical help must be sought immediately.

Methyltetrahydrophthalic anhydride is toxic to aquatic organisms and must not be released into the environment. The local environmental authorities must be informed if large quantities of the compound leak into waterways, soil or sewage.

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