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Pyromellitic dianhydride (PMDA) is a "strategic" monomer in the high-end materials industry. Its highly symmetrical, rigid benzene ring structure and two highly reactive anhydride functional groups allow it to react with diamine monomers to construct polyimide polymers with extreme heat resistance, excellent mechanical properties, and outstanding insulation capabilities. Therefore, the quality of PMDA directly determines the reliability of the final polyimide material in extreme environments, serving as a crucial bridge connecting basic chemical industry with cutting-edge manufacturing.
We offer standard products and high-end specifications to meet the demands of rigorous electronic applications.
| Property | Specification | Test Method |
|---|---|---|
| Product Name | Pyromellitic Dianhydride (PMDA) | - |
| CAS No. | 89-32-7 | - |
| Appearance | White crystalline powder or flakes | Visual |
| Purity (HPLC/GC) | ≥ 99.5% (Standard), ≥ 99.8% (Electronic Grade) | Chromatography |
| Melting Point | 285 - 288 °C | DSC |
| Metal Impurities (Na, K, Fe, etc.) | ≤ 10 ppm (Electronic Grade) | ICP-MS |
For high-performance polymers like polyimide, subtle differences in monomers are significantly amplified through the polymerization reaction, affecting the performance of the final product.
| Comparison Dimension | Common Industrial-grade PMDA | Our High-spec PMDA (The Solution) |
|---|---|---|
| Purity & Consistency | Fluctuating purity; impurities may cause side reactions, leading to broad polymer molecular weight distribution and uneven performance. | Exceptionally high and stable purity ensures controllable and reproducible polymerization, resulting in the expected molecular weight and high-performance resin. |
| Critical Impurity Control | High metal ion content, severely affecting the final polyimide film's electrical insulation properties and long-term stability at high temperatures. | Ultra-low metal ion content (Electronic Grade), specifically designed for applications with stringent electrical performance requirements such as flexible circuit boards and chip coatings. |
| Physical Form & Handling | Uneven powder flowability or particle size may lead to non-uniform dispersion during monomer feeding, affecting reaction homogeneity. | Optimized crystal morphology ensures good flowability and solubility, facilitating precise measurement and uniform mixing. |
| Application Orientation | Suitable for general-purpose plastics or coatings with less demanding electrical properties. | Focused on high-end applications such as electrical insulation and aerospace composite precursors, meeting the most stringent industry standards. |
The value of PMDA is realized through downstream polyimide materials:
The Cornerstone of Electronic and Electrical Insulation
Scenario: Manufacturing polyimide films for flexible copper-clad laminates (such as Kapton® type), used in flexible circuits for smartphones and automotive electronics; producing high-temperature resistant wire and cable insulation coatings for new energy vehicle motors and rail transit.
Function: PMDA provides the film with excellent dimensional stability, solder resistance, and dielectric strength, serving as a core material guarantee for the miniaturization and reliability of electronic devices.
Protection and Support for Cutting-Edge Technology
Scenario: Used as a resin matrix for lightweight composite materials in aerospace applications; manufacturing high-temperature resistant components for jet engines; used as insulation and thermal insulation materials for deep space probes.
Function: The polyimide synthesized from PMDA maintains its performance in extreme temperature ranges from -269°C to 400°C, providing excellent specific strength and radiation resistance.
Key Auxiliary Material for Precision Manufacturing
Scenario: Used in photosensitive polyimide as a buffer coating, stress buffer layer, or redistribution layer material in semiconductor chip manufacturing.
Function: The high purity of PMDA ensures defect-free photolithography processes, and its chemical structure provides good adhesion and chemical resistance.
We understand the critical impact of monomer quality on your subsequent processes.
In-depth Technical Support: We provide detailed consultation on polymerization process parameters, storage, and handling guidelines.
Comprehensive Documentation: Analytical certificates, material safety data sheets, and detailed technical data sheets are provided with each shipment.
Customization Possibilities: We can explore the possibility of fine-tuning product specifications based on your specific polymerization formulations or application requirements.
Q: Does PMDA turning yellow or clumping during storage affect its use?
A: Yes, it will seriously affect its use. Yellowing usually indicates that it has absorbed moisture and undergone partial hydrolysis, leading to decreased activity; clumping results in uneven feeding. It must be strictly protected from moisture and stored in a dry, inert atmosphere or a desiccator. Purity retesting is recommended before use.
Q: Besides the common ODA (4,4'-diaminodiphenyl ether), what other diamines can PMDA be combined with?
A: PMDA can react with various diamines to adjust its properties. For example, reacting with p-phenylenediamine produces a more rigid fiber; copolymerization with silicon-containing diamines can improve the adhesion and flexibility of the resin. The specific choice depends on the performance objectives of the final material.
Q: Are there suitable packaging specifications for laboratory research and development or small-batch trial production?
A: We offer a variety of sealed packaging options ranging from grams to kilograms, meeting the needs of different stages from R&D screening and formulation experiments to pilot-scale production, and ensuring that small-scale products also maintain stable, high quality.
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