Description

5-Sulfoisophthalic Acid Monosodium Salt is a key sulfonated aromatic monomer widely used as a functional intermediate in polymer synthesis. Its primary value lies in introducing permanent anionic charges and hydrophilic sulfonate groups into polymer backbones, significantly enhancing properties like water solubility, dyeability, and antistatic performance. This compound is essential for manufacturers in the production of specialty polyesters, water-soluble resins, and high-performance dispersants.

Application

• Polymer Modification: As a comonomer for synthesizing sulfonated polyesters (SPET) and polyamides to impart water dispersibility and ionic character.
• Dye Receptivity: Incorporated into synthetic fibers to improve affinity for cationic dyes, enabling brighter and more colorfast textiles.
• Dispersants & Surfactants: Serves as a building block for high-performance dispersing agents used in pigments, ceramics, and cement admixtures.
• Ion-Exchange Resins: Used in the manufacture of specialty resins for water treatment and selective ion separation processes.
• Photographic Chemicals: Acts as a functional additive in certain photographic emulsion layers.
• Adhesives & Coatings: Enhances the water-based formulation properties of adhesives, coatings, and inks.

Basic Information

Product Name	5-Sulfoisophthalic Acid Monosodium Salt
CAS No.	7800-91-1
Molecular Formula	C8H5NaO7S
Molecular Weight	268.17 g/mol
Synonyms	5-Sulfoisophthalic Acid Sodium Salt; Sodium 5-Sulfoisophthalate; SIP-Na; Monosodium 5-Sulfoisophthalate; 5-Sodiosulfoisophthalic Acid; 5-Sulfoisophthalic Acid Sodium Salt; Benzene-1,3-dicarboxylic-5-sulfonic Acid Monosodium Salt; 5-Carboxy-2-sulfobenzoic Acid Monosodium Salt
EINECS	232-265-6

Quality Control

Our 5-Sulfoisophthalic Acid Monosodium Salt is manufactured under a stringent quality management system. Each batch undergoes comprehensive analytical testing, including assay, impurity profile, and physical property checks, to ensure consistency and compliance with agreed specifications. A Certificate of Analysis (COA) detailing all test results is provided with every shipment.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at room temperature (15-25°C). This material is hygroscopic (moisture-sensitive); keep the original container tightly sealed to minimize exposure to atmospheric humidity.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Water Content (KF)	≤ 2.0%
Sulfate (as SO4)	≤ 0.5%
Heavy Metals (as Pb)	≤ 10 ppm
pH (5% solution)	3.0 - 5.0

Note: Specifications can be tailored. Please contact us for the detailed technical data sheet of a specific grade.