Tetrahydromethyl-1,3-isobenzofurandione

Methyltetrahydrophthalic anhydride (CAS 11070-44-3), commercially known as MTHPA, is a reactive cyclic anhydride used primarily as a curing agent and hardener for epoxy resin systems.

Where is Tetrahydromethyl-1,3-isobenzofurandione used?

• Epoxy casting and encapsulation compounds for electrical and electronic components: liquid form enables void-free impregnation of transformers and coils
• Industrial coatings: crosslinker for chemical and corrosion resistance in protective finishes on metal substrates and heavy machinery
• Structural adhesives and composite laminates: high glass transition temperatures and mechanical durability for aerospace applications
• It also serves as a reactive intermediate in the synthesis of polyester resins and specialty lubricant additives.

Commercial specifications

• Standard commercial grades: purities of 96% and above
• Drum and IBC quantities