Polymers & Resins REACH

Methylhexahydrophthalic anhydride

CAS Number

25550-51-0

EC Number

247-094-1

Abbreviation

MHHPA

Industries: Plastics & Polymers Coatings, Adhesives, Sealants & Elastomers Electronics & Solar PV

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What is Methylhexahydrophthalic anhydride?

Methylhexahydrophthalic anhydride (CAS 25550-51-0), commonly known as MHHPA, is a liquid cycloaliphatic anhydride used as a curing agent and reactive intermediate in epoxy resin systems.

Where is Methylhexahydrophthalic anhydride used?

Electronics: primary hardener for epoxy encapsulants, LED lens compounds and semiconductor packaging resins
Coatings: high-gloss, chemically resistant finishes for industrial and automotive substrates
Structural adhesives and composites: crosslinks epoxy matrices
Electrical insulation: cast transformers and switchgear potting compounds
Its low viscosity and long pot life suit extended working time.

Commercial specifications

Drums and IBC totes for bulk procurement
Electronic grade meets tighter purity and color specifications

Other Names (Synonyms)

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What are the physical properties of Methylhexahydrophthalic anhydride?

Boiling Point 299°C[at 101 325 Pa]

Density 1.162

Color Colourless

Form Oil

Vapor Pressure 0.274Pa at 25℃

Refractive Index 1.479Nd(25°C)

Log P 2.59 at 25℃

How is Methylhexahydrophthalic anhydride classified and handled safely? Learn More

Danger

GHS05· Corrosive GHS08· Health Hazard GHS07· Irritant

Hazard Statements

H317 May cause an allergic skin reaction

H318 Causes serious eye damage

H334 May cause allergy or asthma symptoms or breathing difficulties if inhaled

H335 May cause respiratory irritation

Precautionary Statements

P233 Keep container tightly closed.

P260 Do not breathe dust/fume/gas/mist/vapours/spray.

P261 Avoid breathing dust/fume/gas/mist/vapours/spray.

P271 Use only outdoors or in a well-ventilated area.

Which trade and regulatory codes apply to Methylhexahydrophthalic anhydride?

HS Code 29329990