Description

Sulphophthalic Acid CAS NO 26657-75-0 is a specialized organic acid derivative of phthalic acid, characterized by its sulfonic acid group, which imparts enhanced water solubility and acidity. This compound is valued in industrial synthesis for its ability to act as an intermediate, catalyst, or functional additive in complex chemical processes. It is primarily required by manufacturers in the polymer, dye, and specialty chemical sectors for producing advanced materials and fine chemicals.

Application

• Key intermediate in the synthesis of specialized dyes and pigments.
• Catalyst or co-catalyst in esterification and polymerization reactions.
• Building block for advanced polymer materials, including polyesters and polyamides.
• Additive in electroplating baths and surface treatment formulations.
• Intermediate for pharmaceutical active ingredients and agrochemicals.
• Component in research and development of novel organic compounds.
• Used in the production of ion-exchange resins and specialty surfactants.

Basic Information

Product Name	Sulphophthalic Acid
CAS No.	26657-75-0
Molecular Formula	C8H6O7S
Molecular Weight	246.19 g/mol
Synonyms	4-Sulphophthalic Acid; 4-Sulfophthalic Acid; 4-Carboxy-3-sulfobenzoic Acid; Benzoic acid, 4-carboxy-3-sulfo-; 3-Sulfophthalic Acid; 3-Carboxy-4-sulfobenzoic Acid; Phthalic acid-4-sulfonic acid; Phthalic-4-sulfonic acid
EINECS	Contact for details

Quality Control

Our Sulphophthalic Acid is produced under strict quality management systems to ensure batch-to-batch consistency and high purity. Each lot undergoes comprehensive analytical testing, including assay, impurity profiling, and identity confirmation. A Certificate of Analysis (COA) detailing all test results is provided with every shipment to guarantee compliance with your technical requirements.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, and well-ventilated area at a controlled room temperature (15-25°C). Due to its hygroscopic (moisture-sensitive) nature, the container must be kept sealed to prevent absorption of atmospheric moisture, which can affect product quality and performance.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 2.0%
Sulfated Ash	≤ 0.5%
Heavy Metals (as Pb)	≤ 20 ppm

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