Isophthalic Acid | 121-91-5

Description :

Isophthalic Acid Supplier and Exporter for the USA

Chemical Bull is an Isophthalic Acid supplier, distributor, wholesaler, and exporter for the USA, supporting commercial requirements for unsaturated polyester resins, PET modification, coating resins, gel coats, and fiberglass-reinforced plastics.

Isophthalic Acid is an aromatic dicarboxylic acid used as a raw material for polyester and specialty resin manufacturing. USA manufacturers evaluate the material based on purity, moisture, color, impurity profile, processing performance, COA, SDS, and batch consistency.

Quick Answer

Isophthalic Acid, CAS 121-91-5, is used to manufacture unsaturated polyester resins, coating resins, gel coats, and selected PET copolymers. It acts as a reactive diacid building block. Buyers should match purity, moisture, color, and impurity specifications to their polymerization process and finished-product requirements.

Contact Chemical Bull for bulk Isophthalic Acid pricing with your required specification, quantity, application, packaging, and USA delivery destination.

What Is Isophthalic Acid?

Isophthalic Acid, also called 1,3-Benzenedicarboxylic Acid, contains two carboxylic acid groups in the meta positions of a benzene ring.

These groups react with glycols and other suitable reactants to form polyester structures. Its molecular arrangement makes it useful for modifying resin properties and producing application-specific polymers.

Purified Isophthalic Acid, commonly abbreviated as PIA, is used where controlled purity and impurities are important for resin production.

Isophthalic Acid is commonly sourced by polyester resin manufacturers, PET producers, coating resin companies, gel coat formulators, composite material businesses, and industrial procurement teams.

Isophthalic Acid Product Information

Product Name: Isophthalic Acid

CAS Number: 121-91-5

Alternate Name: 1,3-Benzenedicarboxylic Acid

Primary Function: Reactive diacid for polyester and resin manufacturing

Confirm grade, purity, moisture, color, and impurity limits from the supplied specification and COA.

Isophthalic Acid Applications for Industrial Manufacturing

Unsaturated Polyester Resin Manufacturing

Isophthalic Acid is used as a diacid raw material in isophthalic unsaturated polyester resin manufacturing.

These resins are selected for applications requiring suitable mechanical properties and resistance to water or specified chemicals. Finished performance depends on the complete resin composition and curing system.

Gel Coat Resin Production

PIA is used in polyester resins formulated for gel coats applied to composite surfaces.

Suitable formulations support surface durability, weatherability, and resistance to water and staining. Manufacturers should evaluate resin color, cure behavior, and the intended exposure conditions.

Fiberglass-Reinforced Plastics

Isophthalic Acid is used to produce polyester matrix resins for fiberglass-reinforced plastic components.

Applications include selected tanks, pipes, panels, and molded composite products. The resin system should be matched to fabrication methods, structural requirements, and service conditions.

PET and Copolyester Modification

Purified Isophthalic Acid is used as a comonomer in selected PET and copolyester manufacturing processes.

It modifies the polymer structure and crystallization behavior. PET producers should control the addition level according to processing requirements and the target packaging or polymer properties.

Polyester Coating Resins

Isophthalic Acid is used in polyester resin synthesis for industrial liquid coatings and selected powder coatings.

Resin manufacturers combine it with suitable glycols and other monomers to achieve the required balance of hardness, flexibility, adhesion, and durability.

Alkyd Resin Manufacturing

Isophthalic Acid is used as a diacid component in selected alkyd resin formulations.

Its contribution depends on the oil or fatty-acid component, polyols, other acids, and resin synthesis conditions. Manufacturers should evaluate the finished coating against application-specific performance requirements.

Why Manufacturers Source Isophthalic Acid

Useful Polyester Building Block

Isophthalic Acid provides reactive carboxylic acid groups for polyester synthesis and resin modification.

Supports Durable Resin Systems

Suitable isophthalic polyester formulations support applications requiring durability and resistance to specified environmental or chemical conditions.

Relevant to PET Modification

PIA allows PET producers to adjust copolymer composition and crystallization behavior according to their manufacturing requirements.

Suitable for Recurring Procurement

Resin and polymer manufacturers can specify an approved grade for repeat purchasing, supported by batch documentation and agreed quality limits.

Isophthalic Acid Supplier for USA Manufacturers

When comparing an Isophthalic Acid supplier for the USA, procurement teams should review purity, moisture, color, relevant organic impurities, metals where specified, and batch consistency.

Chemical Bull supports commercial sourcing enquiries from polyester resin producers, PET manufacturers, coating resin companies, gel coat businesses, composite manufacturers, and distributors across the United States.

For recurring requirements, confirm the approved specification, minimum order quantity, packaging, lead time, and documentation before placing an order.

Related Polyester and Resin Chemicals

Manufacturers sourcing Isophthalic Acid may also explore Neopentyl Glycol, Maleic Anhydride, Phthalic Anhydride, and Ethylene Glycol.

These materials serve different roles in polyester, alkyd, and related resin manufacturing. Selection and proportions should follow the intended polymer chemistry and performance targets.

Isophthalic Acid SDS and Documentation

Chemical Bull can provide available Isophthalic Acid SDS, COA, TDS, and product specifications with commercial supply enquiries.

Buyers should follow the supplied SDS for handling, dust control, storage, and transportation. Keep the material protected from moisture and contamination according to supplier instructions.

Confirm the exact grade and application-specific quality limits before commercial approval.

Buy Isophthalic Acid in Bulk for the USA

Chemical Bull supports bulk Isophthalic Acid sourcing for resin manufacturers, polymer producers, distributors, and industrial procurement teams.

Bulk pricing depends on grade, specification, order quantity, packaging, and delivery terms. Include your required purity, application, documentation needs, and purchasing schedule when requesting a quotation.

Frequently Asked Questions

1. What is Isophthalic Acid?

   Isophthalic Acid is an aromatic dicarboxylic acid used as a reactive raw material in polyester, coating resin, and selected copolymer manufacturing.
   
   

2. What is the CAS number of Isophthalic Acid?

   The CAS number of Isophthalic Acid is 121-91-5. Its alternate name is 1,3-Benzenedicarboxylic Acid.
   
   

3. What is Isophthalic Acid used for?

   It is used in unsaturated polyester resins, gel coat resins, fiberglass-reinforced plastic resin systems, PET modification, polyester coatings, and selected alkyd resins.
   
   

4. What does PIA mean?

   PIA stands for Purified Isophthalic Acid. Buyers should confirm the supplied grade’s purity and impurity limits through its specification and COA.
   
   

5. Are Isophthalic Acid and Terephthalic Acid the same?

   No. Isophthalic Acid has carboxylic acid groups in the 1,3 positions, while Terephthalic Acid has them in the 1,4 positions. This structural difference affects polymer properties and formulation suitability.
   
   

6. Can Chemical Bull support bulk Isophthalic Acid supply for the USA?

   Chemical Bull supports commercial sourcing enquiries for USA manufacturers and distributors. Share your specification, quantity, application, and delivery destination to confirm availability and quotation terms.