Purified Isophthalic Acid (PIA)
| Formula: | C₈H₆O₄ |
| CAS Number: | 121-91-5 |
| EC Number (EINECS): | 201-549-8 |
| HS Code: | 29171990 |
| UN Number: | Not classified as dangerous for transport |
| IUPAC Name: | Benzene-1,3-dicarboxylic acid |
| Also Known As: | Isophthalic Acid; 1,3-Benzene Dicarboxylic Acid |
| Molecular Weight, g/mol: | 166.13 |
Typical Specifications
| Appearance: | White crystalline powder |
| Odor: | Odorless |
| Melting Point, °C: | 345–348 |
| Boiling Point, °C: | Decomposes on heating |
| Density, g/cm³ (at 20°C): | 1.54 |
| Flash Point, °C: | Not applicable |
| pH (1% solution): | ~3.0 |
| Purity, %: | ≥99.8 |
| Grades Available: | Industrial, Polymer Grade |
| Packaging: | 25kg bags, 500kg/1000kg jumbo bags, bulk |
Applications / Uses
Primary Applications
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Key monomer for production of high-performance polyester resins
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Used in polyethylene terephthalate (PET) resins for fibers and bottles
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Raw material for unsaturated polyester resins (UPR)
Secondary Applications
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Specialty coatings and adhesives
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Industrial laminates and reinforced plastics
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Additive in polymer blends to improve thermal and chemical resistance
End Industries Served: Polyester & PET resins, Fibers, Plastics, Coatings, Adhesives, Laminates
Safety & Handling Information
Hazard Class (GHS): May cause mild irritation
Hazard Statements (H-Codes):
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H319: Causes serious eye irritation (dust)
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H335: May cause respiratory irritation (dust)
Precautionary Statements (P-Codes):
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P280: Wear protective gloves/eye protection
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P261: Avoid breathing dust
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P305 + P351 + P338: IF IN EYES – rinse cautiously with water, remove contact lenses if present
Storage Conditions
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Store in cool, dry, ventilated place
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Keep packaging tightly sealed
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Avoid moisture and contamination
Transport Information
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ADR/RID: Not classified as dangerous goods
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IMDG: Not classified as dangerous goods
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IATA: Not classified as dangerous goods