Description

5-Methylisophthalic Acid is a high-purity aromatic dicarboxylic acid derivative, serving as a critical building block for advanced polymers and specialty chemicals. Its value lies in providing a rigid, substituted benzene core that enables the synthesis of materials with tailored thermal and mechanical properties. This compound is essential for R&D and production teams in the polymer, pharmaceutical intermediate, and liquid crystal industries seeking to innovate with precise molecular architectures.

Application

• Polymer Intermediate: A key monomer for the synthesis of high-performance polyesters, polyamides, and polyimide resins, contributing to heat resistance and structural integrity.
• Pharmaceutical Synthesis: Used as a versatile building block in creating active pharmaceutical ingredients (APIs) and complex organic intermediates.
• Liquid Crystal Materials: Employed in the production of monomers for liquid crystal polymers (LCPs) and display materials due to its rigid, angular structure.
• Coating & Adhesive Formulations: Enhances the performance of powder coatings, adhesives, and inks by modifying polymer backbone properties.
• Metal-Organic Frameworks (MOFs): Acts as an organic linker in the construction of porous coordination polymers for catalysis and gas storage.
• Chemical Research & Development: Serves as a standard or reagent in organic synthesis and material science research.

Basic Information

Product Name	5-Methylisophthalic Acid
CAS No.	3347-99-7
Molecular Formula	C9H8O4
Molecular Weight	180.16 g/mol
Synonyms	5-Methylbenzene-1,3-dicarboxylic Acid; 3-Methylisophthalic Acid; Isophthalic Acid, 5-Methyl-; 1,3-Benzenedicarboxylic acid, 5-methyl-; 5-Methyl-m-phthalic acid
EINECS	222-108-5

Quality Control

Our 5-Methylisophthalic Acid is manufactured under a strict quality management system. Each batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets exacting specifications for high-purity applications. Certificates of Analysis (COA) documenting all critical parameters are provided with every shipment to guarantee traceability and consistency.

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). Due to its hygroscopic nature, the container must be kept tightly sealed to minimize exposure to atmospheric moisture.

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

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