Isophthalic acid CAS#121-91-5

CAS Number: 121-91-5
Chemical Formula: C8H6O4
Synonyms:

RARECHEM AL BO 0036
1,3-BENZENEDICARBOXYLIC ACID
1,3-PHENYL DICARBOXYLIC ACID

Appearance: White Powder

MOQ (Minimum Order Quantity): 1 FCL (Full Container Load)

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Product Details

Isophthalic acid CAS#121-91-5

Isophthalic acid is an organic compound with the formula C6H4(CO2H)2. This colourless solid is an isomer of phthalic acid and terephthalic acid. These aromatic dicarboxylic acids are used as precursors (in form of acyl chlorides) to commercially important polymers, e.g. the fire-resistant material Nomex. Mixed with terephthalic acid, iso phthalic acid is used in the production of resins for drink bottles. The high-performance polymer poly benzimidazole is produced from iso phthalic acid.Isophthalic acid is a white crystalline powder or needle-like crystals and it’s an isomer of phthalic acid and terephthalic acid.It is insoluble in cold water but soluble in oxygenated solvents and alcohol. It is combustible and finely dispersed particles will form explosive mixtures in air.

Isophthalic Acid (PIA) is mainly used in the production of bottle PET, also used in the production of alkyd resin, polyester resin, also used in the production of photosensitive materials, pharmaceutical intermediates and so on.
One of the largest applications for PIA is in unsaturated polyester resins for high-quality gel coats. The hardness, stain and detergent resistance characteristics of PIA are ideal for polyester solid-surface countertops that are an inexpensive alternative to acrylics.

Isophthalic acid Chemical Properties

Melting point	341-343 °C (lit.)
Boiling point	214.32°C (rough estimate)
density	1,54 g/cm3
vapor pressure	0Pa at 25℃
refractive index	1.5100 (estimate)
storage temp.	Sealed in dry,Room Temperature
solubility	0.12g/l
form	Crystalline Powder
pka	3.54(at 25℃)
color	White to off-white
PH	3.33(1 mM solution);2.76(10 mM solution);2.24(100 mM solution)
Water Solubility	0.01 g/100 mL (25 ºC)
Merck	14,5197
BRN	1909332
Dielectric constant	1.4（Ambient）
Stability:	Stable. Incompatible with strong oxidizing agents, strong bases.
InChI	1S/C8H6O4/c9-7(10)5-2-1-3-6(4-5)8(11)12/h1-4H,(H,9,10)(H,11,12)
InChIKey	QQVIHTHCMHWDBS-UHFFFAOYSA-N
SMILES	OC(=O)c1cccc(c1)C(O)=O
LogP	1.66 at 25℃
CAS DataBase Reference	121-91-5(CAS DataBase Reference)
NIST Chemistry Reference	1,3-Benzenedicarboxylic acid(121-91-5)
EPA Substance Registry System	Isophthalic acid (121-91-5)

Safety Information

Hazard Codes	Xi
Risk Statements	36/37/38
Safety Statements	24/25-36-26
WGK Germany	2
RTECS	NT2007000
Autoignition Temperature	1198 °F
TSCA	TSCA listed
HS Code	29173980
Storage Class	13 - Non Combustible Solids
Hazardous Substances Data	121-91-5(Hazardous Substances Data)

Product Application of Isophthalic acid CAS#121-91-5

Isophthalic acid is used as an intermediate for high performance unsaturated polyesters, resins for coatings, high solids paints, gel coats and modifier of polyethylene terephthalate for bottles. It acts as precursors for the fire-resistant material nomex as well as used in the preparation of high-performance polymer polybenzimidazole. It is also employed as an input for the production of insulation materials.

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