Description

4-Hydroxyisophthalic Acid is a versatile aromatic dicarboxylic acid derivative, distinguished by the presence of a hydroxyl group on the benzene ring. This unique bifunctional structure makes it a valuable high-purity intermediate for synthesizing advanced polymers, liquid crystals, and pharmaceutical active ingredients. It is primarily sought by R&D chemists and production specialists in the fine chemical, advanced material, and pharmaceutical industries for creating compounds with tailored thermal and mechanical properties.

Application

• Polymer & Resin Synthesis: A key monomer for producing high-performance polyesters, polyamides, and epoxy resins with enhanced thermal stability and mechanical strength.
• Liquid Crystal Manufacturing: Serves as a crucial building block in the synthesis of liquid crystal polymers (LCPs) and monomers for display technologies.
• Pharmaceutical Intermediates: Used in the research and production of complex drug molecules, where its carboxylic and phenolic functionalities allow for precise chemical modifications.
• Coordination Chemistry & Metal-Organic Frameworks (MOFs): Acts as an organic linker or ligand due to its multiple coordination sites, useful in creating porous materials for catalysis and gas storage.
• Dye & Pigment Production: Employed as an intermediate in the synthesis of specialized dyes and organic pigments.
• Crosslinking Agent: Functions as a crosslinker in coatings and adhesives to improve chemical resistance and durability.
• Academic & Industrial Research: A valuable reagent for chemical research and development in material science and organic synthesis.

Basic Information

Product Name	4-Hydroxyisophthalic Acid
CAS No.	636-46-4
Molecular Formula	C8H6O5
Molecular Weight	182.13 g/mol
Synonyms	5-Carboxysalicylic Acid; 1,3-Benzenedicarboxylic acid, 4-hydroxy-; Isophthalic acid, 4-hydroxy-; 4-Hydroxybenzene-1,3-dicarboxylic Acid; 4-HIPA
EINECS	211-257-3

Quality Control

Our 4-Hydroxyisophthalic Acid is produced under a strict quality management system. Every batch undergoes rigorous analytical testing to ensure it meets the high standards required for advanced synthesis. We provide comprehensive Certificates of Analysis (COA) with each shipment, detailing purity, identity, and impurity profiles. Specifications can be tailored to meet specific research or cGMP requirements upon request.

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 nature, the container must be kept tightly sealed to prevent moisture absorption, which can affect product stability and handling properties.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to structure
Assay (HPLC)	≥ 98.0%
Loss on Drying	≤ 1.0%
Residue on Ignition	≤ 0.1%
Heavy Metals (as Pb)	≤ 20 ppm
Related Substances (HPLC)	Individual impurity ≤ 0.5%; Total impurities ≤ 1.5%

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