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3,3',4,4'-Biphenyltetracarboxylic dianhydride is an important pharmaceutical intermediate.
BPDA (CAS 2420-87-3, C₁₆H₆O₆, MW 294.22) is a white crystalline dianhydride monomer whose two phthalic anhydride rings are directly linked, forming a rigid, linear backbone. It is the key building block for high-performance polyimides.
Uses: flexible copper-clad laminates and FPC films, semiconductor advanced packaging (PSPI, RDL dielectrics), OLED/foldable display substrates and CPI windows, LCD alignment layers, aerospace thermal films, PI fibers, gas-separation membranes, COFs, and research reagents.
Selling points: lowest CTE among common dianhydrides (near copper), highest thermal/dimensional stability, low moisture uptake, low Dk/Df for high-frequency use, tiny dose with low cost-in-use, grade ladder from industrial to electronic purity, and exposure to AI packaging, foldables, and EV/aerospace growth.
Watch-outs: moisture-sensitive (hydrolyzes to tetra-acid), isomer purity matters, respiratory sensitizer dust, long customer qualification cycles, and performance claims must be tied to the final polymer.
| Items | Technical index |
| Product name | 3,3',4,4'-Biphenyltetracarboxylic dianhydride |
| CAS NO. | 2420-87-3 |
| Molecular formula | C16H6O6 |
| Molecular weight | 294.22 |
| Appearance | White powder |
| Purity | 99%min |
| Product parameters | |
| Cas number: | 2420-87-3 |
| Appearance: | White powder |
| Purity: | 99%min |
| Package details: | 1kg/foil bag; 25kg/drum |
| Brand: | Fortunachem |
Uses:
3,3′,4,4′-Biphenyltetracarboxylic dianhydride (abbreviated BPDA, often s‑BPDA for "symmetric"), CAS 2420-87-3, EINECS 219-342-9, InChIKey WKDNYTOXBCRNPV-UHFFFAOYSA-N.
Formula C₁₆H₆O₆, MW 294.22. Systematic name: [5,5′-biisobenzofuran]-1,1′,3,3′-tetrone.
Appearance: white to off‑white crystalline powder; mp ≈ 299–306 °C; density ≈ 1.62 g/cm³; vapor pressure negligible at RT; it sublimes under vacuum/high temperature.
Solubility: essentially insoluble in water (and slowly hydrolyzed by it to the tetra‑acid); soluble in hot polar aprotic solvents (DMF, DMAc, NMP) where it reacts with diamines to form poly(amic acid).
Structure logic: two phthalic anhydride units linked directly by a biphenyl bond. That gives a rigid, linear, conjugated, rod‑like backbone with no flexible ether/ketone hinge and no heteroatoms. This is the whole reason it exists commercially.
Why the Structure Matters (the "value story")
When polymerized with a rigid diamine (e.g., p‑phenylenediamine, PDA) and imidized, s‑BPDA yields biphenyl-type polyimide whose chains pack tightly and stay stiff:
| Property imparted | Typical outcome |
|---|---|
| Rigid linear backbone | Tg often > 260 °C, some grades > 500 °C; decomposition > 500 °C |
| Chain packing / order | Very low CTE (~8–12 ppm/K with PDA) — close to copper |
| No polar hinge, dense packing | Low moisture absorption & low hygroscopic expansion |
| Aromatic, no labile bonds | Excellent solvent/chemical resistance, radiation resistance |
| Low dipole mobility | Low dielectric constant & low loss tangent at high frequency |
This is why UBE's UPILEX®‑S (made from its own in‑house BPDA) is the benchmark film for dimensional stability, and why bpda‑type PI beats PMDA‑type (Kapton‑class) in applications where warpage, fine-line patterning and humidity stability matter.
Main Uses
1. High-end polyimide films & flexible electronics (largest volume)
Adhesiveless two-layer FCCL (2L‑FCCL), coverlay/base films for FPC, COF/TAB carrier films, stiffeners, display driver substrates.
Speaker diaphragms, thin-film heaters, laser printer belts, magnet wire enamel, release/transfer films.
2. Semiconductor advanced packaging (fastest-growing, highest grade requirement)
Photosensitive polyimide (PSPI) resins, passivation layers, stress-buffer coats, RDL interlayer dielectrics, WLP insulation, and glass-substrate TGV filling for 2.5D/3D/Chiplet and AI packages.
3. Flexible displays
OLED substrate/base layers, CPI (colorless/transparency-engineered PI) cover windows, foldable hinge substrates, touch & under-display insulating layers.
4. Liquid crystal alignment agents
Polyimide alignment layers for LCD/OLED — rubbed or photo-alignment; BPDA-based PI gives strong pretilt control and high thermal/UV stability through the panel process.
5. Aerospace, defense & industrial
Thermal-control films for satellites, radomes, insulation for aerospace wiring, honeycomb/foam core, high-strength PI fibers for hot-gas filtration, protective fabrics.
6. Membranes & frontier materials
Gas-separation membranes (dense, chemically resistant), COFs/MOFs and other porous frameworks as a rigid linker, battery separators/binders, specialty adhesives, and biomedical encapsulation materials (BPDA/PDA PI shows good biocompatibility). Also sold as a research reagent.
Grades matter: industrial grade (~97–99%) suffices for fibers/films/adhesives; electronic grade typically requires assay ≥ 99.5–99.8% (HPLC), single metal ion ≤ 1 ppm (some spec ≤ ppb levels for glass substrates), moisture ≤ 300–1000 ppm, low insolubles — usually achieved by vacuum sublimation/recrystallization.
| # | Selling point | Why buyers care |
|---|---|---|
| 1 | Lowest CTE among common dianhydrides | CTE near copper → less curl/warpage in FPC, finer L/S capability, reliable 2L‑FCCL without adhesive. |
| 2 | Highest thermal/dimensional stability | Survives 400 °C+ reflow/anneal, plasma etch, and long-term 260–300 °C service. |
| 3 | Low moisture uptake + low Dk/Df | Less hygroscopic swelling, stable impedance — key for 5G/mmWave, AI servers, 800G optics. |
| 4 | Tiny dose, huge leverage | Used at a few percent-to-stoichiometric level in resin; cost-in-use is small vs. the value of the finished film/package → low price sensitivity, high margin potential. |
| 5 | Grade ladder = multiple markets from one molecule | Sell industrial grade to fiber/film makers and electronic grade to semiconductor customers; same chemistry, different purification. |
| 6 | Purity is a defensible spec | Metal-ion and particle control is measurable and auditable (ICP‑MS, HPLC) — lets you compete on data, not just price. |
| 7 | Import substitution / dual sourcing story | Historically dominated by UBE/Mitsubishi; regional supply chains want qualified local sources — a strong pitch in Asia and for customers de-risking single-source. |
| 8 | Exposure to secular growth themes | Advanced packaging (Chiplet, glass substrate), foldables, AI hardware, EV/aerospace electrification — demand tailwinds rather than commodity cycles. |
| 9 | Research & niche premium | Small but growing use in COFs, gas membranes, and academic work; gram/kg quantities at high margins, plus early engagement with future large-scale users. |
| 10 | Pairs well in copolymer systems | Copolymerizing with ODA, a‑BPDA, 6FDA, TFDB etc. tunes solubility, transparency (CPI), CTE and Dk — you sell "formulation flexibility," not just one number. |
Points You Must Disclose / Watch Out For
Moisture sensitivity: the anhydride rings hydrolyze to the tetra‑acid on exposure to humid air, which shifts stoichiometry, raises viscosity unpredictably and can ruin molecular weight. Must be packed in foil/argon, stored cool & dry, and released against assay/anhydride equivalent & moisture specs. Once opened, use quickly.
Isomer purity: trace a‑BPDA/i‑BPDA changes Tg, solubility and CTE of the final PI; specify isomer content if your customer runs tight film specs.
Handling & safety: diacid dianhydrides are skin/eye/respiratory irritants and known respiratory sensitizers; powders generate dust — require PPE, local exhaust, and proper GHS labeling/SDS. Reacts exothermically with water/amines. Not a food-contact or pharmaceutical ingredient.
Processing reality: very high mp and poor solubility mean purification is energy-intensive (sublimation) and PI must be processed via poly(amic acid) or specialized routes; this is a technical-sale business, not a spot-commodity business. Expect long qualification cycles (film/packaging customers may take 6–24 months).
Claims belong to the polymer, not the monomer: you cannot claim "heat resistant to 500 °C" for BPDA itself; all performance claims must be tied to a specific PI formulation and supported by test data (CTE, Tg, Dk/Df, moisture, HAST/reflow).
Regulatory/customer-specific lists: electronic-grade users will audit against their own AVL/halogen/metal specs; check REACH status and any local restrictions for your target market.
Also, if you have any other questions, you can contact us
FAQ From Wuhan Fortuna Chemical Co.,Ltd
Q1: Can I get a sample for free ?
A: For small QTY and low value product, we can provide sample for free exclude shipping cost. For high value sample, we will charge the basic sample cost, but we can refund all the cost if customers place order after sample test.
Q2: How to confirm the product quality before placing orders ?
A: Most of our products confirm to international standards like USP/EP/BP/JP/CP. We will provide COA/TDS/MSDS for customers to confirm the specification before placing order.
Q3: What is the payment you accept?
A: For small and low value order, we accept CreditCard, MaterCard,VISA,Western Union and T/T.For large order, we can do T/T and L/C. Any pay on delivery or pay-after are not available for us.
Q4: What is your shipment way ?
A: For less than 100kg gross weight order will ship with courier like FedEx or UPS, we support customers to place courier orders remotely by their account, we will package the goods well and wait for pick up.For more than 100kg goods, we will transport by Air or Sea according to customers' requirement.
Q5: How long is your after-sales service?
A: We accept customer’s quality complaint in three month after customer received the goods. We provide tech.support for all-life if customer place order from our company.
Q6: How do you treat quality complaint ?
A: We support customer to provide our products to any rightful third party testing organization to test our products according to the COA specification, if the test result is confirm with COA, we will take all the loss for customers.
Name:Wuhan Fortuna Chemical Co.,Ltd
Category:Others
Trade Category: Trading Company
Employees: 11 - 50 People
Address: Room 2015, No.2 Building, Kaixin Mansion No.107
Company Information: Wuhan Fortuna Chemical Co.,Ltd established in 2006, is a big integrative chemical enterprise being engaged in Pharmaceutical and Intermediates, Food and Feed additives, Fine chemicals,Biochemical and Reagent, which is the members of Hubei E-commerce Chamber.
Our company has professional persons who major in chemical R&D and sicentific management, supply fine chemical products with high quality and close service, also supply custom-tailored products according to our clients' requirement.
We have a positive and self-motivated management work team with a common philosophy, caring and commitment through teamwork, our team strive to achieve success in delighting our clients and ourselves.
Since Wuhan Fortuna Chemical Co., Ltd founded, we continuously innovate our products and improve our service, sales network. Hence, we initiate the first sale mode on net in China, which is the retail trade of small package bring along wholesale of diversified management modes. Our products are exported widely to South Korea, Vietnam, Australia, Europe and South America, highly recommended by our clients.We insist on the management creed “Market is our compass, Quality is our life, Credit is our soul”. Clients’ trust is our forward power, their satisfaction is our struggling goal.
Wuhan Fortuna Chemical Co.,Ltd is a professional manufacturer which provide 3,3',4,4'-Biphenyltetracarboxylic Dianhydride with good quality and best price, welcome to contact us to get COA/TDS/MSDS of 3,3',4,4'-Biphenyltetracarboxylic Dianhydride.
1. Guaranteed purity;
2. Large quantity in stock;
3. Largest manufacturer;
4. Best service after shipment with email;
5. High quality & competitive price;
Used as pharmaceutical intermediate.
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