Isophthalic Acid (121-91-5)
1. Basic Information
1. Chemical Name: Isophthalic Acid
2. Chinese Aliases: Isophthalic Acid; Meta-Phthalic Acid; 1,3-Benzenedicarboxylic Acid; PIA
3. English Name: Isophthalic Acid
4. Molecular Formula: C₈H₆O₄
5. Molecular Weight: 166.13
6. CAS Number: 121-91-5
7. EINECS Number: 204-506-4
8. Appearance: White powder, no impurities
2. Technical Parameters
| Item | Unit | Standard |
|------|------|---------|
| Grade | - | Premium | First-class | Qualified |
| Appearance | - | White powder, no impurities |
| Purity | % (mass fraction) | ≥99.90 | ≥99.70 | ≥99.50 |
| Acid Value | mgKOH/g | 675±2 |
| Ash Content | mg/kg | ≤15 | ≤25 |
| Moisture | % (mass fraction) | ≤0.10 | ≤0.15 | ≤0.20 |
| 3-CBA Content | mg/kg | ≤25 |
| MOL Content | mg/kg | ≤150 |
| DMF Color (5g/100ml) | Platinum-Cobalt Scale | ≤10 |
| Color Difference, b* Value | - | ≤1.5 | ≤2.0 | ≤2.5 |
| Iron | mg/kg | ≤2.0 | ≤3.0 |
| Total Metals (Mo, Cr, Ni, Co, Mn, Ti, Fe) | mg/kg | ≤10 | ≤15 |
(The above parameters are for reference only. Actual values depend on the factory inspection report.)
3. Packaging Specifications
The usual packaging is 25kg per bag, and 0.5-ton packages are also available.