BTDA, also known as 3,3′,4,4′-benzophenonetetracarboxylic dianhydride, is an aromatic dianhydride used in polyimide synthesis and selected epoxy curing systems.
JLON supplies BTDA in multiple purity grades to help customers balance material requirements, processing performance and purchasing costs. Available purity options include 98%, 99%, 99.5% and 99.8%.
| Property | Information |
|---|---|
| Product name | 3,3′,4,4′-Benzophenonetetracarboxylic Dianhydride |
| Abbreviation | BTDA |
| CAS number | 2421-28-5 |
| EC number | 219-348-1 |
| Molecular formula | C17H6O7 |
| Molecular weight | 322.23 g/mol |
| Chemical category | Aromatic dianhydride |
| Appearance | Pale yellow to off-white or white powder, depending on grade |
| Available purity grades | 98%, 99%, 99.5% and 99.8% |
Purity limits, analytical methods and additional quality requirements are agreed for the selected grade. Pricing depends on the specification, order quantity and delivery requirements.
BTDA provides two anhydride groups that participate in polymer formation with suitable diamines. Its benzophenone structure makes it an established building block for a range of aromatic polyimide formulations.
BTDA is used to produce polyimide matrix resins for fiber-reinforced composites. Applications include heat-resistant aerospace and industrial components reinforced with carbon, glass or other fibers.
BTDA is used in polyimide coatings and insulating varnishes for wire enamels and electrical components. It is also used as a curing agent in heat-resistant epoxy powder coatings.
BTDA is a monomer for aromatic polyimide films used in electrical insulation and selected flexible-electronics applications. Film properties can be tailored through the choice of diamines and the overall polymer formulation.
BTDA is used as a heat-activated anhydride curing agent for epoxy powder coatings, electrical potting compounds and molding compounds. It supports formulations requiring thermal stability, chemical resistance and electrical insulation.
The most suitable grade is the one that meets your process requirements consistently.
When comparing BTDA grades, consider:
Purity and the analytical method used
Water content
Acid-related impurities and anhydride functionality
Residual solvents and other organic impurities
Metal and ionic contamination where relevant
Particle size and dissolution or dispersion behavior
Batch-to-batch consistency
For demanding applications, define individual impurity limits rather than relying on the overall purity percentage alone.
Different customers may require different acceptance criteria. A resin synthesis process may prioritize effective functionality and polymerization consistency, while a film or coating process may require additional control of solution clarity, color and particulate contamination.
Share your existing specification or reference material with JLON so that the proposed grade can be reviewed against your requirements.
BTDA is moisture sensitive. Keep the material tightly sealed and follow the storage and handling instructions in the Safety Data Sheet for the supplied grade.
Please confirm packaging, shelf life and any drying requirements before use. Storage temperature and pretreatment conditions should follow the applicable product documentation.
BTDA is used as a dianhydride monomer in polyimide synthesis and as a curing agent in selected epoxy formulations.
No. BTDA is a reactive raw material used to manufacture polymers. It must be processed through an appropriate formulation and reaction route.
JLON offers 98%, 99%, 99.5% and 99.8% purity options. Contact us to compare specifications and prices for your application.
Not necessarily. The required grade depends on the process and acceptance limits. Some applications require particularly tight impurity control, while others can use a more economical grade after qualification.
BTDA can be used in formulations for electronic and electrical applications. Suitability depends on the specified limits for metals, ionic impurities, moisture and particles, together with validation of the finished material.
Contact JLON to discuss BTDA specifications, sample requirements and pricing.
