PRODUCT DATA SHEET (TDS)
1. Product Identification
| Item | Details |
| Product Name | Dimethyl-5-sulfoisophthalate Sodium Salt |
| CAS No. | 3965-55-7 |
| Molecular Formula | C₁₀H₉NaO₇S |
| Molecular Weight | 296.23 g/mol |
| Appearance | White Powder |
2. Typical Specifications
| Analysis Item | Unit | Standard | Typical Test Result |
| Appearance | – | White powder | White powder |
| Color (APHA) | – | ≤ 15 | < 10 |
| Purity (GC) | % | ≥ 99.0 | 99.35 |
| Moisture | % | ≤ 0.40 | 0.21 |
| Acid Value | mgKOH/g | ≤ 0.50 | 0.32 |
| Saponification Value | mgKOH/g | 375–381 | 378.60 |
| Sulfate Ion | ppm | ≤ 100 | ≤ 100 |
| Fe (Ferrum) | ppm | ≤ 5 | ≤ 4 |
| Chloride Ion | ppm | ≤ 10 | ≤ 10 |
| Absorbance | – | ≤ 0.05 | 0.040 |
3. Physical & Chemical Properties
| Item | Details |
| Melting Point | > 300 ℃ |
| Boiling Point | Decomposes before boiling |
| Flash Point (C.O.C.) | 138 ℃ |
| Specific Gravity | 1.458 g/cm³ |
| Solubility | Soluble in water and ethylene glycol; slightly soluble in methanol |
4. Applications
Key comonomer for cationic dyeable polyester (CDP) production, enhancing dyeability and color fastness.
Applied in waterborne polyester resins, improving adhesion and weather resistance of coatings and inks.
Used in nylon modification to enhance hydrophilicity and dyeing compatibility.
Applied in high-performance functional coatings and adhesive manufacturing.
5. Packaging & Storage
Packaging: 25kg paper bag , 500kg flexible big bags
Storage: Keep in a cool, dry, well-ventilated warehouse. Store away from heat sources and incompatible materials.
Shelf Life: 24 months under proper storage conditions.
6. Safety & Handling
Use standard personal protective equipment (safety goggles, gloves, and dust masks) when handling.
Avoid inhalation of dust and contact with skin and eyes.
Refer to the product SDS for detailed safety and handling instructions.
