Agent Name

Isophthalic acid

Alternative Name

m-Phthalic acid

CAS Number

121-91-5

Formula

C8-H6-O4

Major Category

Other Classes

Synonyms

Acide isophtalique [French]; Benzene-1,3-dicarboxylic acid; IPA; Isophthalate; Kyselina isoftalova [Czech]; m-Benzenedicarboxylic acid; m-Phthalic acid; 1,3-Benzenedicarboxylic acid; [ChemIDplus]

Category

Organic Acids

Description

Colorless solid; [Hawley] Sublimes without decomposition; [Merck Index] Melting point = 347 deg C; [HSDB] Faintly beige powder; [MSDSonline]

Sources/Uses

Used to make plastics, unsaturated polyester resins, alkyd resins, polyamides, and thermoplastic polyesters; Used as a co-monomer with terephthalic acid to make plastic bottles and specialty resins; [HSDB] Used in formulations for adhesives, inks, wire enamels, and dental materials; [CAMEO]

Comments

A mild skin irritant; [ICSC] May cause irritation; [MSDSonline] No evidence of eye or skin irritation in animal studies; Caused kidney stones in animals fed >400 mg/kg per day; [AIHA]

Exposure Assessment
MAK

5 mg/m3, inhalable fraction

WEEL

10 mg/m3, (total dust), 5 mg/m3 (respirable fraction)

Vapor Pressure

1.5E-8 mm Hg

Explanatory Notes

VP = 0.068 mm Hg at 100 deg C; [HSDB]

Links to Other NLM Databases
Health Studies

Human Health Effects from Hazardous Substances Data Bank:

Toxicity Information

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Chemical Information

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Related Information in HazMap
Processes

Industrial Processes with risk of exposure: