Isophthalic acid

Modify Date: 2025-08-20 20:07:38

Isophthalic acid Structure
Isophthalic acid structure
 Common Name Isophthalic acid
CAS Number 121-91-5 Molecular Weight 166.131
Density 1.5±0.1 g/cm3 Boiling Point 412.3±28.0 °C at 760 mmHg
Molecular Formula C8H6O4 Melting Point 341-343 °C(lit.)
MSDS Chinese USA Flash Point 217.3±20.5 °C

 Use of Isophthalic acid


Isophthalic acid is an intermediate for high performance unsaturated polyesters, resins for coatings, high solids paints, gel coats and modifier of polyethylene terephthalate for bottles.

 Names

Name isophthalic acid
Synonym More Synonyms

 Chemical & Physical Properties

Density 1.5±0.1 g/cm3
Boiling Point 412.3±28.0 °C at 760 mmHg
Melting Point 341-343 °C(lit.)
Molecular Formula C8H6O4
Molecular Weight 166.131
Flash Point 217.3±20.5 °C
Exact Mass 166.026611
PSA 74.60000
LogP 1.66
Vapour Pressure 0.0±1.0 mmHg at 25°C
Index of Refraction 1.618
Stability Stable. Incompatible with strong oxidizing agents, strong bases.
Water Solubility 0.01 g/100 mL (25 ºC)

 Toxicological Information

CHEMICAL IDENTIFICATION

RTECS NUMBER :
NT2007000
CHEMICAL NAME :
Isophthalic acid
CAS REGISTRY NUMBER :
121-91-5
BEILSTEIN REFERENCE NO. :
1909332
LAST UPDATED :
199701
DATA ITEMS CITED :
8
MOLECULAR FORMULA :
C8-H6-O4
MOLECULAR WEIGHT :
166.14
WISWESSER LINE NOTATION :
QVR CVQ

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :
Standard Draize test
ROUTE OF EXPOSURE :
Administration into the eye
SPECIES OBSERVED :
Rodent - rabbit
REFERENCE :
85JCAE "Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J., Prague, Czechoslovakia, Avicenum, 1986 Volume(issue)/page/year: -,317,1986 ** ACUTE TOXICITY DATA **
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Oral
SPECIES OBSERVED :
Rodent - rat
DOSE/DURATION :
10400 mg/kg
TOXIC EFFECTS :
Details of toxic effects not reported other than lethal dose value
REFERENCE :
85JCAE "Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J., Prague, Czechoslovakia, Avicenum, 1986 Volume(issue)/page/year: -,317,1986
TYPE OF TEST :
LD50 - Lethal dose, 50 percent kill
ROUTE OF EXPOSURE :
Intraperitoneal
SPECIES OBSERVED :
Rodent - mouse
DOSE/DURATION :
4200 mg/kg
TOXIC EFFECTS :
Behavioral - somnolence (general depressed activity) Behavioral - excitement Nutritional and Gross Metabolic - body temperature decrease
REFERENCE :
COREAF Comptes Rendus Hebdomadaires des Seances, Academie des Sciences. (Paris, France) V.1-261, 1835-1965. For publisher information, see CRASEV. Volume(issue)/page/year: 246,851,1958 *** REVIEWS *** TOXICOLOGY REVIEW BPCT** Progress Report from the Environmental Protection Agency to NIOSH on Benzenepolycarboxylates, 1974 Volume(issue)/page/year: -,183,1974 *** OCCUPATIONAL EXPOSURE LIMITS *** OEL-RUSSIA:STEL 0.2 mg/m3;Skin JAN 1993 *** NIOSH STANDARDS DEVELOPMENT AND SURVEILLANCE DATA *** NIOSH OCCUPATIONAL EXPOSURE SURVEY DATA : NOHS - National Occupational Hazard Survey (1974) NOHS Hazard Code - 82897 No. of Facilities: 3665 (estimated) No. of Industries: 67 No. of Occupations: 68 No. of Employees: 55161 (estimated) NOES - National Occupational Exposure Survey (1983) NOES Hazard Code - 82897 No. of Facilities: 8709 (estimated) No. of Industries: 59 No. of Occupations: 49 No. of Employees: 117411 (estimated) No. of Female Employees: 17858 (estimated)

 Safety Information

Personal Protective Equipment Eyeshields;Gloves;type N95 (US);type P1 (EN143) respirator filter
Hazard Codes Xi:Irritant
Risk Phrases R36/37/38
Safety Phrases S24/25-S36-S26
RIDADR NONH for all modes of transport
WGK Germany 2
RTECS NT2007000
HS Code 29173980

 Synthetic Route

 Customs

HS Code 2917391000
Summary 2917391000 isophthalic acid。Supervision conditions:None。VAT:17.0%。Tax rebate rate:9.0%。Lowest tariff:6.5%。General tariff:30.0%

 Articles30

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 Synonyms

5-CARBOXAMINODOTRYPTAMINE
5-CARBOXAMIDOTRYPTAMINE HEMIETHANOLATE MALEATE SALT
Isophthalic acid
iso-phthalic acid
benzene-1,3-dicarboxylic acid
MFCD00002516
1,3-Benzenedicarboxylic acid
EINECS 204-506-4
5-carboxamidotrypamine
5-Carboxamidotryptamine
2-Carboxyamidotryptamine
5-carboxybenzoic acid
isophthalic_acid
5-CT
5-Carboxamide tryptamine
isophtalic acid
5-Carboxyamidotryptamine
1,3-benzene dicarboxylic acid
m-phthalic acid
Benzen-1,3-Dicarboxylic acid
hydrogen isophthalate
5-CAT
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