Agent Name

Methylhexahydrophthalic anhydride

CAS Number

25550-51-0

Formula

C9-H12-O3

Major Category

Plastics & Rubber

Synonyms

1,3-Isobenzofurandione, hexahydromethyl-; Hexahydromethylphthalic anhydride; 1,2-Cyclohexanedicarboxylic anhydride, methyl-; [ChemIDplus] Methylhexahydrophthalic acid anhydride; Hexahydromethylphthalic acid anhydride; MHHPA; [ICSC]

Category

Acid Anhydrides, Cyclic

Description

Colorless liquid; [ICSC] Clear liquid; Irritating odor when hot; [Dixie Chemical MSDS]

Sources/Uses

Cyclic acid anhydrides: Used to make polyester and alkyd resins, plasticizers, and as epoxy resin hardeners; [Reference #1]

Comments

Slowly decomposed by water forming acids; A skin and severe eye irritant; May cause skin and respiratory sensitization; [ICSC] Cyclic acid anhydrides can cause irritation and sensitization by dermal, mucous membrane, and inhalation from occupational exposure; The most common allergic diseases reported are rhinoconjunctivitis and asthma, allergic contact dermatitis is rare; [Reference #1] Reacts slowly with water; May cause severe eye irritation, corneal injury, and burns; Prolonged skin contact may cause severe irritation and burns; May cause skin and respiratory sensitization; Chronic inhalation exposure may cause bronchitis and asthma; [Dixie Chemical MSDS] See "ACID ANHYDRIDES." See "Hexahydrophthalic anhydride."

Reference Link

INCHEM CICAD: Cyclic Acid Anhydrides - 2009

Exposure Assessment
Vapor Pressure

0.007 mm Hg

Adverse Effects
Skin Sensitizer

Yes

Asthma

Yes

Dermatotoxin

Skin Burns

Links to Other NLM Databases
Toxicity Information

Search TOXNET

Chemical Information

Search ChemIDplus

Related Information in HazMap
Diseases

Occupational diseases associated with exposure to this agent:

Processes

Industrial Processes with risk of exposure: