Description

Isophthalic Acid is a high-purity aromatic dicarboxylic acid isomer, essential for producing advanced polymers with superior thermal and chemical resistance. Its meta-substituted benzene ring structure offers distinct performance advantages over other isomers, enabling the formulation of materials with enhanced properties. This compound is a critical raw material for manufacturers in the coatings, unsaturated polyester resins (UPR), and specialty plastics industries seeking to improve product durability and performance.

Application

• Unsaturated Polyester Resins (UPR): A key monomer for producing high-performance resins used in fiberglass-reinforced plastics (FRP) for marine, automotive, and construction applications.
• Powder Coatings: Used in the synthesis of polyester resins for durable, weather-resistant, and decorative powder coatings for metals.
• High-Performance Plastics: A comonomer in the production of polyethylene terephthalate (PET) and polybutylene terephthalate (PBT) to enhance thermal stability and mechanical strength.
• Alkyd Resins: Improves the drying time, hardness, and chemical resistance of alkyd resins used in industrial paints and varnishes.
• Specialty Polymers: Serves as a building block for polyamides, polyurethanes, and liquid crystal polymers (LCPs) requiring high heat deflection temperatures.
• Adhesives and Sealants: Imparts improved adhesion and flexibility in high-performance adhesive formulations.
• Chemical Intermediates: Used in the synthesis of plasticizers, dyes, and other fine chemicals.

Basic Information

Product Name	Isophthalic Acid
CAS No.	121-91-5
Molecular Formula	C8H6O4
Molecular Weight	166.13 g/mol
Synonyms	IPA; 1,3-Benzenedicarboxylic Acid; m-Phthalic Acid; m-Benzenedicarboxylic Acid; Isophthalic Acid; Benzene-1,3-dicarboxylic Acid; m-Dicarboxybenzene
EINECS	204-506-4

Quality Control

Our Isophthalic Acid is manufactured under a stringent quality management system. Every batch undergoes comprehensive analytical testing to ensure it meets precise specifications for purity, color, and acidity. Certificates of Analysis (COA) are provided with each shipment, detailing key parameters such as assay, moisture content, and metal impurities. We adhere to relevant industry standards to guarantee consistent quality and performance for your production needs.

Storage

Preserve in a tightly closed container, protected from light. Store in a cool, dry, well-ventilated area away from incompatible materials such as strong bases and oxidizing agents. Recommended storage temperature is between 15°C and 25°C (59°F and 77°F). The product is hygroscopic (moisture-sensitive); keep containers tightly sealed when not in use to prevent moisture absorption.

Specification

Item	Specification
Appearance	White crystalline powder
Identification (IR)	Conforms
Assay (HPLC)	≥ 99.5 %
Melting Point	345 - 348 °C
Moisture (KF)	≤ 0.2 %
Ash Content	≤ 0.01 %
Acidity (Titration)	675 - 678 mg KOH/g
Color (APHA)	≤ 20

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