Overview
Itaconic acid (CAS 97-65-4 ) is a bio-based unsaturated dicarboxylic acid produced through fungal fermentation, positioning it as a renewable alternative to petrochemical monomers in polymer synthesis.
Its reactive double bond and dual carboxylic groups make it a sought-after building block for specialty resins, coatings, and superabsorbent materials used across various industrial sectors.
In polymer and resin manufacturing, it is copolymerized with acrylic acid, styrene, or vinyl acetate to modify adhesion, flexibility, and hydrophilicity in coatings, binders, and pressure-sensitive adhesives.
Superabsorbent polymer producers incorporate it to tune water absorption performance in hygiene and agricultural products. In personal care, it functions as a co-monomer in film-forming polymers.
Food and flavor applications use it as an acidulant and flavoring agent, where its mild acidity profile suits beverage and confectionery systems requiring precise pH control and stability.
The material is supplied as a white crystalline powder in bags, supersacks, and bulk quantities suited to industrial procurement volumes. Standard commercial grades include technical and FCC specifications.
Purity levels are typically at 99% or above for most applications. Fermentation-derived material dominates the market, and buyers should confirm feedstock origin with suppliers for bio-based claims.
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Physical Properties
| Melting Point | 162-164 °C (decomp) |
| Boiling Point | 268 °C |
| Density | 1.632 g/cm³ |
| Flash Point | 268°C |
| Appearance | white to light beige crystalline powder |
| Color | White to light beige |
| Odor | Characteristic Odor |
| Form | Crystalline Powder or Crystals |
| Water Solubility | Soluble in water, acetone, methanol, hexane and ethanol. Slightly soluble in benzene, chloroform, carbon disulfide and petroleum ether. |
| Vapor Pressure | 0.0000115 Pa (20 °C) |
| Refractive Index | 1.4980 (estimate) |
| pH | 2 (10g/l, H2O, 20℃) |
| Log P | -0.301 at 20℃ |
Safety & Handling
Danger GHS05 GHS07 Hazard Statements H315 Causes skin irritation H318 Causes serious eye damage H319 Causes serious eye irritation H335 May cause respiratory irritation H402 Harmful to aquatic life Precautionary Statements P261 Avoid breathing dust/fume/gas/mist/vapours/spray. P264 Wash … thoroughly after handling. P271 Use only outdoors or in a well-ventilated area. P273 Avoid release to the environment. P280 Wear protective gloves/protective clothing/eye protection/face protection. P317 Get emergency medical help. P319 Get medical advice/attention if you feel unwell. P321 Specific treatment (see … on this label). P405 Store locked up. P501 Dispose of contents/container in accordance with local regulations. P264+P265 Wash … thoroughly after handling. P302+P352 IF ON SKIN: Wash with plenty of water. P304+P340 IF INHALED: Remove person to fresh air and keep comfortable for breathing. P332+P317 Get emergency medical help. P337+P317 If eye irritation persists: Get medical advice/attention. Get emergency medical help. P362+P364 Take off contaminated clothing and wash it before reuse. P403+P233 Store in a well-ventilated place. Keep container tightly closed. P305+P351+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P305+P354+P338 IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
Trade & Regulatory
| HS Code | 29171990 |
| Storage Class | 13 - Non Combustible Solids |
| WGK (Germany) | 1 |
Other Names
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Chemical Properties
- CAS Number
- 97-65-4
- EC Number
- 202-586-1
- Mol. Weight
- 130.10
- HS Code
- 29171990
- Category
- Flavors & Fragrances