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3a-methyl-5,6-dihydro-4H-isobenzofuran-1,3-dione News & Market Updates

While MTHPA is best known as an epoxy resin curing agent, its applications extend across multiple industries. In electronics, it serves as an intermediate for insulating materials in motors, dry-type transformers, high-voltage switches, and capacitors. It also plays a role in…

Marcus Hayes on Aug 17, 2026

Methyl tetrahydrophthalic anhydride (MTHPA) is a key curing agent in two-component heat-cured epoxy potting systems, prized for its low viscosity and high loading capacity that enable dual curing and diluting roles. With tertiary amine accelerators, it cures at 80-120°C and…

Elena Vasquez on Aug 06, 2026

China's MTHPA industry is undergoing significant capacity expansion, led by Puyang Huicheng, the dominant domestic producer. The company's projects include a 10,000-tonne MTHPA line from its Shandong Qingyang acquisition and a planned 21,000-tonne addition under its…

Priya Kapoor on Aug 03, 2026

Properties

CAS Number: 19438-64-3
EINECS No.: 234-290-7
Molecular Formula: C9H10O3
Molecular Weight: 166.17
InChI: InChI=1/C9H10O3/c1-9-5-3-2-4-6(9)7(10)12-8(9)11/h3,5-6H,2,4H2,1H3
Density: 1,21 g/cm3
Boiling Point: 120 °C/3 mmHg
Flash Point: 157 °C
Refractive Index: 1.4970 to 1.5020
Water Solubility: Soluble in water
Risk Codes: S26;S36/37/39;S37/39;S24;S22
Safety Description: R36/37/38;R42/43;R41

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