Description

1,3-Isobenzofurandione, 5,5'-(1,4-Phenylene)Bis- is a high-purity organic chemical intermediate belonging to the class of aromatic dianhydrides. This compound is valued for its role as a key building block in the synthesis of advanced polymeric materials, particularly high-performance polyimides and polyamides. It is essential for manufacturers in the electronics, aerospace, and specialty coatings industries seeking to develop materials with exceptional thermal stability and mechanical strength. The product is supplied under stringent quality control to ensure batch-to-batch consistency for critical applications.

Application

• Polyimide Monomer: A critical precursor for the synthesis of high-temperature, high-strength polyimide resins and films used in flexible printed circuits (FPC) and semiconductor insulation layers.
• Advanced Polymer Synthesis: Serves as a dianhydride monomer for producing specialty polyamides, polyamide-imides, and other engineering plastics with enhanced thermal and chemical resistance.
• Electronic Encapsulation Materials: Used in formulations for protective coatings and encapsulants that shield sensitive electronic components from heat and environmental stress.
• Aerospace Composites: Incorporated into matrix resins for lightweight composite materials requiring durability under extreme operational conditions.
• Specialty Adhesives & Coatings: A key ingredient in high-performance adhesive and coating systems where long-term thermal stability is paramount.
• Research & Development: Employed in academic and industrial R&D for developing novel polymeric architectures and functional materials.

Basic Information

Item	Details
Product Name	1,3-Isobenzofurandione, 5,5'-(1,4-Phenylene)Bis-
CAS No.	106070-55-7
Molecular Formula	C22H10O6
Molecular Weight	370.31 g/mol
Synonyms	5,5'-(1,4-Phenylene)bis(1,3-isobenzofurandione); 1,4-Bis(1,3-dioxo-1,3-dihydro-2-benzofuran-5-yl)benzene; 5,5'-(p-Phenylene)diphthalic anhydride; p-Phenylenebis(phthalic anhydride); BPDA (commonly refers to biphenyl dianhydride, check isomer specificity); 4,4'-(1,4-Phenylene)bis(1,3-dioxo-1,3-dihydro-2-benzofuran-5-carboxylic acid) dianhydride; PPDA (Phenylene diphthalic anhydride); Contact for details on additional trade names.
EINECS	Contact for details

Quality Control

Our 1,3-Isobenzofurandione, 5,5'-(1,4-Phenylene)Bis- is manufactured under a strict quality management system. Every batch undergoes comprehensive analytical testing, including HPLC for purity and identity confirmation, to ensure it meets precise specifications for high-end polymer applications. Certificates of Analysis (COA) documenting purity, moisture content, and other critical parameters are available upon request. We adhere to cGMP principles where applicable to support our customers in regulated industries.

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 under dry conditions to prevent degradation. Keep away from incompatible materials such as strong bases and amines.

Specification

Item	Specification
Appearance	White to off-white crystalline powder
Identification (IR)	Conforms to reference spectrum
Purity (HPLC)	≥ 98.5%
Melting Point	285 - 295 °C
Loss on Drying	≤ 0.5%
Heavy Metals (as Pb)	≤ 10 ppm

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