ro4450f datasheet

RO4450T Prepreg: Thickness, Dk and PCB Lamination

Thursday, October 8th, 2026

RO4450T prepreg is a Rogers ceramic-filled, glass-reinforced thermoset bonding material for multilayer RF PCBs. It bonds circuit layers together while forming part of the board’s dielectric structure. The correct selection includes the material grade, nominal thickness, copper layout and required finished dielectric spacing. A single Dk value does not describe every RO4450T construction. For example, Rogers lists a Dk of 3.23 for the 3 mil construction and 3.35 for the 4 mil construction at 10 GHz. This guide explains how those differences affect stackup selection, lamination and finished-board verification.

RO4450T prepreg between copper foil and an RO4000 core in an exploded multilayer PCB illustration

Key Takeaways

RO4450T is a bonding layer for multilayer RF boards, not a copper-clad core.
Dk and Df depend on the selected construction. Check the corresponding thickness row and test conditions before assigning material properties.
Nominal prepreg thickness is not automatically the finished spacing between patterned copper layers.
RO4450T and RO4450F are different materials. A substitution requires an electrical and manufacturing review.
Lamination must control resin flow, filling and cure through the actual press book, not only the press setpoint.
Material handling, cross-section inspection and impedance verification support repeatable RF stackups. Send the stackup and copper data with your RF PCB quotation request.

What Is RO4450T Prepreg Used For?

RO4450T bonds the layers of multilayer RF PCBs used in applications such as communications equipment, power amplifiers and small cells. During lamination, its resin flows around the circuit features and cures to join the stack.

The bonding layer matters electrically wherever the signal field passes through it. In stripline structures, for example, the dielectric around a trace can include both a core and a bonding layer. Giving the whole region the core’s Dk can produce the wrong impedance model.

At EBest Circuit, we support RF PCB fabrication with Rogers materials and stackup review. For a design specifying RO4450T, we review the requested construction, copper geometry and inspection requirements before confirming material sourcing and the manufacturing plan.

In material searches, “Rogers prepreg” and “Rogers bondply” can describe related bonding-material needs. The family name alone is insufficient for a fabrication drawing: identify RO4450T and its construction explicitly.

RO4450T Datasheet: Which Thickness and Dk Apply?

The RO4450T datasheet lists nominal thicknesses from 2.5 to 6 mil, with separate Dk and Df values for each construction. The table below follows the Rogers datasheet available when this article was prepared.

Nominal thickness	Dk at 10 GHz	Df at 10 GHz
2.5 mil / 0.064 mm	3.26 ± 0.05	0.0037
3 mil / 0.076 mm	3.23 ± 0.05	0.0039
3.5 mil / 0.089 mm	3.19 ± 0.05	0.0033
4 mil / 0.102 mm	3.35 ± 0.05	0.0042
4.5 mil / 0.114 mm	3.29 ± 0.05	0.0044
5 mil / 0.127 mm	3.28 ± 0.05	0.0038
6 mil / 0.152 mm	3.24 ± 0.05	0.0044

Rogers reports these electrical values at 23°C and 50% RH using IPC-TM-650 2.5.5.5. They are material-characterization data, not a guarantee of a finished circuit’s impedance or insertion loss.

For simulation, document the construction, frequency and material model. A designer comparing a 3 mil and a 4 mil bonding layer must update both dielectric thickness and Dk; changing only the spacing leaves the model incomplete. Final line width also depends on copper thickness, etched trace shape and the adjacent reference planes.

How Does RO4450T Differ from RO4450F?

RO4450T and RO4450F differ in dielectric properties and material construction, so they should not be treated as drop-in replacements. Rogers’ published product comparison gives the following electrical values.

Material	Published Dk	Published Df
RO4450T, 3 mil construction	3.23 ± 0.05	0.0039
RO4450F	3.52 ± 0.05	0.0040

These are 10 GHz material values. The small Df difference alone does not establish which finished board will have lower loss: conductor roughness, geometry and route length also contribute.

When reviewing the RO4450F datasheet against RO4450T, compare the intended dielectric thickness, glass construction and processing guidance as well as Dk. Our RO4450F multilayer stackup guide covers the F-grade material separately.

If an approved design changes from F to T, revise the stackup and recalculate the affected transmission lines before releasing the board. Keep the material change visible in the fabrication revision rather than leaving a purchasing substitution undocumented.

Why Does Finished Dielectric Thickness Change?

Finished dielectric thickness changes because resin fills the spaces between copper features during pressing; copper thickness and pattern density affect how much resin remains above those features.

A nominal sheet value measured under a defined material test condition cannot describe every patterned circuit. Two regions with different copper coverage can impose different filling demands on the same bonding layer.

Conceptual comparison of nominal prepreg sheet thickness and finished dielectric spacing above patterned copper

For an impedance-controlled layer, specify the required finished dielectric spacing and tolerance on the approved stackup. The fabricator then selects and qualifies a construction that can achieve it with the actual copper pattern.

Provide copper artwork, not just the layer count and overall board thickness.
Identify which signal layers reference which planes.
Agree on the measurement location and acceptance range.
Use a representative cross-section to verify the built spacing.

Adding nominal sheet values is useful for an initial thickness estimate, but it is not a substitute for a bonded stackup calculation.

How Should RO4450T Be Placed in the Stackup?

Place RO4450T at the bonding interfaces that need its dielectric performance, then define each adjacent core, copper layer and finished separation. Rogers identifies RO4835T as a matched core system; other combinations need their own stackup review.

Start with the electrical function of each layer rather than selecting every dielectric by the same material name:

Locate RF traces and their continuous reference planes.
Assign the core and bonding materials around those traces.
Calculate line geometry using the selected constructions.
Review copper balance and the mechanical symmetry of the full stack.
Freeze the approved materials, dimensions and impedance targets in the fabrication package.

A hybrid board may combine RF materials with FR-4 in less electrically demanding regions. That can reduce the amount of RF material used, but it adds a material-compatibility and pressing review. Cost reduction should not remove the specified RF dielectric from a signal’s field region.

Keep the layer numbering and reference-plane assignments consistent between the CAD files and fabrication drawing. Our PCB design guidance provides a starting point for preparing the manufacturing information.

What Does RO4450T Lamination Require?

RO4450T lamination requires a controlled resin-flow stage followed by adequate cure, with the temperature measured through the press book. Rogers’ RO4400 processing guidance describes a low-viscosity window around 100–120°C and a 175°C cure dwell of 60 minutes.

Those reference conditions are not a complete recipe for every board. Press loading, copper distribution and the material combination determine how the book reaches the required conditions. Record the qualified cycle for the actual construction.

RO4450T lamination concept showing resin flow around copper traces and the consolidated bonding layer

Heat-up: verify the internal book temperature rather than relying only on platen temperature.
Filling: confirm resin fills the patterned-copper topography without leaving voids or starving the interface.
Pressure: qualify it together with the heat-up cycle and board construction.
Cure: verify the specified dwell at the material, including the slowest-heating region.

For sequential builds, evaluate the cumulative thermal history and the interfaces already present. A successful first lamination does not by itself qualify later bonding cycles.

How Should RO4450T Prepreg Be Stored?

Store RO4450T in its sealed packaging under the supplier’s controlled conditions. Rogers’ RO4400 guidance specifies 10–32°C storage and a six-month shelf life from shipment when properly stored; it advises against refrigeration, freezing and vacuum storage.

Sealed packaging, clean handling and controlled storage for RO4450T bonding sheets

Use first-in, first-out lot control, reseal opened packages and follow any newer lot-specific instructions. Yellowing or hardened material requires disposition rather than routine release to production.

At receiving and material issue, record the grade, construction, lot and expiry information. Keep cut sheets clean and protected from creasing. If storage history is unknown, quarantine the lot for review; do not assume that a drying cycle restores its original processing behavior.

Which Manufacturing Defects Should Be Checked?

Check the bonded dielectric spacing, resin fill, interface integrity, drilled-hole condition and electrical performance. A board can pass continuity testing while still having a dimensional or RF-performance problem.

Inspection	Primary check	Potential defect
Cross-section	Dielectric spacing and resin fill	Out-of-tolerance spacing, voids, resin starvation
Interface examination	Bonded-layer integrity	Separation or delamination
Hole-wall examination	Drilling, cleaning and plating condition	Residue, damaged walls, plating discontinuities
Impedance coupon	Specified transmission-line impedance	Geometry or dielectric deviation

Illustration of PCB microsection thickness measurement and impedance coupon probing

Rogers’ RO4835T/RO4450T processing guidance emphasizes assessing hole quality and choosing cleaning conditions accordingly. Aggressive etchback can disturb the material around the hole wall. Tool life and cleaning parameters therefore need process evidence, not assumptions copied from a different laminate.

Impedance testing and insertion-loss testing answer different questions. If the project has an RF loss limit, define the test frequency, structure and method separately. Do not treat a passing impedance coupon as proof that the entire RF path meets its loss budget.

What Should You Send for an RO4450T PCB Quote?

Send the fabrication files, proposed stackup, RO4450T construction and electrical requirements so we can evaluate the actual board rather than quote only a material name.

Gerber or ODB++ data, drill files and fabrication drawing.
Layer count, core materials and specified bonding-layer construction.
Finished board thickness and critical dielectric tolerances.
Starting and finished copper requirements.
Impedance targets, tolerances and relevant RF test requirements.
Surface finish, quantity and required delivery date.
BOM, placement data and test instructions if assembly is included.

If the stackup is not final, identify which dimensions are fixed and which we may propose. Material availability, panel utilization, lamination complexity and inspection scope can all affect the quotation.

FAQ About RO4450T Prepreg

Is RO4450T a copper-clad laminate?

No. It is a bonding material. The copper foil and cured cores are separate elements in the multilayer construction.

Is a 3 mil RO4450T sheet equivalent to a 3 mil core?

No. A core is already cured, whereas the bonding sheet flows and cures during lamination. Their roles and finished-thickness behavior differ.

Can two RO4450T sheets be used to build a thicker bonding layer?

Multiple sheets may be considered in a qualified stackup, but the resulting bonded thickness and resin distribution must be evaluated. Two nominal sheet values do not automatically become the final dielectric spacing.

Does the material’s UL 94 V-0 rating certify the finished PCB?

No. A material flammability classification does not replace the finished PCB’s applicable recognition, construction limits or project qualification.

Can a generic “Rogers material” note replace the exact grade?

No. State the core and bondply grades separately and include the selected construction. Otherwise, the purchasing and manufacturing teams cannot reliably reproduce the intended dielectric stack.

How Can EBest Circuit Support Your RF PCB Project?

We support RF PCB manufacturing, DFM review and PCB assembly, helping you carry the approved material and stackup requirements into fabrication and assembly documentation.

For an RO4450T project, our review starts with the bonding-layer construction, copper pattern and finished dielectric target. We then confirm sourcing, manufacturing feasibility and the inspection scope with you. If a proposed material change affects the RF stackup, we raise it for approval before production.

Send your Gerber files and stackup to sales@bestpcbs.com. Include your impedance requirements and quantity, and we can review the build and prepare a project-specific quotation.

What Is RO4450F Prepreg?

RO4450F is a Rogers high frequency thermoset prepreg, also called bondply. It is used to bond layers together in multilayer PCB structures, especially when RO4000 series laminates are used in RF or microwave boards.

It is different from a copper clad core. A core already has copper on one or both sides, while prepreg is placed between layers during lamination. During pressing, the resin softens, fills around copper patterns, and bonds the stack together.

In practical PCB design, this material is often used with Rogers high frequency laminates such as RO4003C, RO4350B, RO4835, RO4350G2, and RO4000 LoPro materials. RO4400 bondply materials are designed for RO4000 multilayer constructions.

Why Is RO4450F Important in High Frequency Multilayer PCB Stackup?

A high frequency multilayer PCB does not rely only on the core material. The prepreg layer also becomes part of the electrical structure, especially when signal layers are close to reference planes. RO4450F helps define dielectric spacing, bonding quality, and stackup consistency.

In RF and microwave boards, small changes in dielectric height can affect impedance and signal behavior. A stable bonding layer helps the finished PCB stay closer to the intended stackup design after lamination.

RO4450F is also useful when the board has multiple signal layers, copper planes, and via transitions. It helps fill around etched copper patterns while supporting reliable layer adhesion.

For this reason, RO4450F should be reviewed together with the full stackup, including copper weight, dielectric spacing, impedance requirement, via structure, and final board thickness.

How Does RO4450F Work as a Bonding Layer in PCB Stackup?

In a PCB stackup, RO4450F is placed between copper layers, high frequency cores, or foil layers before lamination. During pressing, the resin flows around the copper pattern, fills small open areas, and bonds the layers into one multilayer board.

It bonds PCB layers: It joins high frequency cores, inner copper layers, and foil layers into a stable structure.
It forms a dielectric layer: After lamination, it becomes part of the dielectric path between conductors.
It affects pressed thickness: Final thickness depends on copper weight, copper distribution, and lamination conditions.
It supports copper pattern filling: Resin flow helps fill spaces around etched copper features.
It influences impedance: Its Dk and pressed thickness should be included in stackup calculation.
It supports multilayer reliability: Proper bonding helps improve layer adhesion and plated through hole stability.

RO4450F should be treated as both a bonding material and a functional dielectric layer. This makes it important for high frequency multilayer PCB stackup design.

How Thick is Rogers RO4450F?

Rogers RO4450F has a standard thickness of 0.0040 inch, about 0.102 mm. This is the value most designers check first when building a high frequency multilayer stackup.

In a real PCB build, pressed thickness can shift slightly because resin must fill the copper pattern. Copper weight, copper balance, plane coverage, etched area, and press cycle all affect the actual dielectric spacing.

Each 4 mil ply bonds to about 0.004 inch / 0.101 mm when pressed between flat opposing surfaces, while the thickness added to a multilayer construction depends on copper weight and distribution.

What is Dielectric Constant of RO4450F?

The dielectric constant of RO4450F is 3.52 ± 0.05 at 10 GHz in the z direction. This value is important because the bonding sheet is part of the RF dielectric path, not just a mechanical adhesive.

Dk affects signal velocity, controlled impedance, stripline trace width, layer spacing, and coupling between signal layers. If the wrong Dk is used in a field solver, the fabricated board may deviate from the intended impedance.

For accurate stackup review, the Dk value, copper roughness, copper thickness, trace geometry, and pressed dielectric spacing should be checked together.

How Does RO4450F Affect Impedance Control and Signal Stability?

RO4450F affects impedance because its dielectric constant and pressed thickness influence the distance between signal traces and reference planes. When this prepreg is close to an RF trace, it becomes part of the controlled impedance structure.

For stripline routing, the signal trace is usually buried between reference planes. If the bonding layer becomes thinner or thicker after lamination, the impedance value may shift. This is why pressed thickness should be checked before fabrication.

For RF and high speed boards, signal stability also depends on material loss. RO4450F has low loss behavior for high frequency use, but the final result still depends on trace geometry, copper thickness, copper roughness, surface finish, and via design.

Before production, the stackup should be reviewed with the actual dielectric height, Dk value, copper weight, line width, spacing, and impedance target. This helps the finished PCB meet the expected signal behavior more consistently.

Rogers RO4450F Datasheet Overview

The RO4450F datasheet should be read as a design and fabrication reference, not just a material label. The values below summarize important data for this Rogers bondply. Typical values should be verified again when preparing final production documents. Here is a table and PDF of Rogers RO4450F datasheet for your reference:

Parameter	Rogers RO4450F Typical Value
Material Type	High frequency thermoset bondply / prepreg
Standard Thickness	0.0040 in / about 0.102 mm
Dielectric Constant	3.52 ± 0.05 at 10 GHz
Dissipation Factor	0.004 at 10 GHz
Thermal Conductivity	0.65 W/m·K
Moisture Absorption	0.09%
Tg	>280°C
Td	390°C
CTE	X 19, Y 17, Z 50 ppm/°C
Flammability	UL 94 V-0
Lead-Free Process Compatibility	Yes

RO4450F Bondply Data Sheet-EBest Download

These values help designers review Dk, Df, thermal conductivity, Tg, Td, CTE, UL rating, and lead-free compatibility when preparing a high frequency multilayer PCB stackup.

Difference Between RO4450B and RO4450F Prepreg

RO4450B and RO4450F are both Rogers RO4400 series high frequency bondply materials. They are used as bonding layers in multilayer PCB stackups with RO4000 series laminates. The main difference is not their basic function, but their available thickness, dielectric value, and resin flow behavior.

Item	RO4450B	RO4450F
Material Family	Rogers RO4400 series bondply	Rogers RO4400 series bondply
Material Type	High frequency thermoset prepreg	High frequency thermoset prepreg
Main Function	Bonding layer for RO4000 multilayer PCB constructions	Bonding layer for RO4000 multilayer PCB constructions
Standard Thickness	0.0036 in / 0.091 mm and 0.0040 in / 0.101 mm	0.0040 in / 0.101 mm
Dielectric Constant	3.30 ± 0.05 or 3.54 ± 0.05 at 10 GHz, depending on thickness	3.52 ± 0.05 at 10 GHz
Dissipation Factor	0.004 at 10 GHz	0.004 at 10 GHz
Thermal Conductivity	0.60 W/m·K	0.65 W/m·K
Tg	>280°C	>280°C
Td	390°C	390°C
Z-Axis CTE	60 ppm/°C for 0.0036 in version; 50 ppm/°C for 0.0040 in version	50 ppm/°C
Flow Behavior	Standard RO4400 bondply flow behavior	Improved lateral flow capability
Fill Requirement	Suitable for standard RO4000 multilayer bonding structures	More suitable when the stackup has difficult fill requirements
Sequential Lamination	Supported by RO4400 bondply family	Supported by RO4400 bondply family
Lead-Free Process	Compatible	Compatible
Typical Use Direction	Existing or previously approved stackups	New stackups or designs needing better resin flow
Replacement Advice	Keep using it when the stackup is already verified	Review when better filling behavior is needed

The material data shows that RO4450B and RO4450F share the same high frequency bondply family, similar loss factor, high Tg, lead-free compatibility, and RO4000 multilayer compatibility. RO4450F is mainly highlighted for improved lateral flow capability, which makes it useful for new multilayer stackups or structures with more demanding fill requirements.

What Applications Use Rogers RO4450F PCB Material?

This prepreg is mostly used where the board needs multilayer construction and stable high frequency behavior. It is a practical fit for RF, microwave, and high speed interconnect boards that use Rogers RO4000 series cores.

RF communication modules: Used where low loss paths and controlled impedance are needed.
Microwave PCB assemblies: Supports multilayer routing and stable dielectric spacing.
Power amplifier PCBs: Helps create reliable RF stackups with controlled layer bonding.
Antenna module PCBs: Useful when the antenna feed structure needs repeatable dielectric behavior.
Small cell and DAS boards: Fits compact communication hardware with multilayer RF routing.
Backhaul radio boards: Supports high frequency paths in outdoor or telecom equipment.
Radar PCBs: Used in multilayer RF boards where material consistency matters.
Test and measurement boards: Helps maintain signal behavior in precision RF test hardware.
Mixed material multilayer PCBs: Suitable when high frequency cores and other materials must be laminated together.

Stackup and Lamination Considerations for RO4450F PCB Fabrication

A good build starts with a clear stackup, not with material selection alone. The prepreg must match the copper pattern, impedance target, via structure, and press cycle.

Copper thickness: Heavy inner copper needs careful fill review. RO4400 bondply materials can fill up to 0.0018 inch of total copper thickness, with more bondply needed when fill exceeds that range.
Copper distribution: Large plane areas and open etched areas can create uneven resin flow. Copper balance helps pressed thickness remain more consistent.
Layer count: Higher layer count boards may need a more detailed lamination plan, especially with buried copper and mixed materials.
Pressed thickness: Do not use nominal thickness alone for final impedance. Pressed dielectric height should be checked against copper pattern and fabrication tolerance.
Impedance coupon: RF and high speed boards should include a coupon plan when controlled impedance is required.
Inner layer treatment: Metal surfaces should receive a suitable oxide or oxide alternative treatment for better adhesion.
Press profile: A reduced viscosity range around 100°C to 120°C and bonding pressures commonly between 400 and 750 PSI may be used depending on fill needs.
Drilling and desmear: Multilayer RO4000 constructions may require desmear after drilling, while etchback of core and prepreg layers is not recommended.
Surface finish: ENIG, immersion silver, OSP, and other finishes should be selected according to RF performance, soldering needs, and storage conditions.
Batch repeatability: For production, stackup, material lot control, lamination records, impedance data, and inspection results should be documented.

Why Choose EBest for RO4450F Multilayer PCB Fabrication?

High frequency multilayer fabrication needs more than access to Rogers materials. It needs stackup review, DFM checking, impedance control, lamination control, drilling quality, inspection, and clear communication before production. Here are reasons why choose EBest for RO4450F multilayer PCB fabrication:

Rogers high frequency PCB fabrication: Support for RF, microwave, antenna, radar, communication, and high speed multilayer boards.
Stackup review before production: Review dielectric spacing, copper thickness, layer order, impedance targets, and final board thickness.
DFM checking: Check manufacturability risks in spacing, via structure, copper balance, annular ring, solder mask, and panel layout.
Impedance control: Support microstrip, stripline, differential pair, and RF trace requirements.
Mixed material PCB capability: Support Rogers materials with other PCB materials when the structure requires it.
Inspection and testing: AOI, electrical test, dimensional checks, and quality records for controlled production.
Prototype and batch support: Support small quantity validation and later volume production under the same fabrication control path.
PCBA service availability: PCB fabrication can be combined with component sourcing, SMT assembly, testing, and box build service when needed.

FAQs About Rogers RO4450F Prepreg

Q1: Can RO4450F be laminated with RO4350B or RO4003C?
A1: Yes. RO4450F is commonly used with Rogers RO4000 series high frequency laminates, including RO4350B and RO4003C. The final stackup should still be reviewed according to layer count, copper weight, dielectric spacing, and impedance target.

Q2: When should this Rogers bondply be considered for an RF multilayer PCB?
A2: It is suitable when the board needs stable dielectric spacing, controlled impedance, low signal loss, and reliable multilayer bonding. It is often used in RF, microwave, antenna, radar, and high speed communication boards.

Q3: Does one ply always provide enough resin fill?
A3: Not always. Resin fill depends on copper thickness, copper pattern density, open area, and lamination pressure. For heavy copper or uneven copper layouts, the stackup may need extra review before fabrication.

Q4: Will the final pressed thickness match the nominal thickness exactly?
A4: The nominal thickness is a starting value. The final pressed thickness may change slightly after lamination because resin flows around etched copper patterns. For controlled impedance boards, the calculation should use the reviewed fabrication stackup instead of only the nominal material value.

Q5: Can RO4450F replace RO4450B directly?
A5: It should not be replaced directly without review. RO4450F has improved lateral flow behavior, but replacement still needs checking for Dk, thickness, resin flow, impedance, and previous production approval.

Q6: Is this bondply suitable for sequential lamination?
A6: Yes. RO4400 series bondply materials can be used in multilayer structures that may involve sequential lamination. The press cycle, inner layer treatment, and total thermal history should be reviewed before production.

Q7: What may cause impedance deviation in this type of stackup?
A7: Common causes include pressed dielectric thickness variation, copper thickness tolerance, copper roughness, trace width deviation, resin flow change, and reference plane distance. A controlled stackup and impedance coupon can help reduce these risks.

Q8: Is standard FR4 prepreg a good substitute in RF layers?
A8: Usually not for controlled RF layers. Standard FR4 prepreg has different dielectric behavior and higher loss at high frequency. For RF paths, the bonding material should match the required Dk, Df, dielectric thickness, and impedance structure.

Q9: What should be prepared before requesting fabrication?
A9: Prepare Gerber files, stackup drawing, material callout, copper weight, finished board thickness, impedance requirements, surface finish, via structure, and estimated quantity. These details help the factory review manufacturability faster.

Q10: Can EBest support both PCB fabrication and assembly for this material?
A10: Yes. EBest can support Rogers high frequency PCB fabrication, DFM review, stackup checking, impedance control, PCB manufacturing, component sourcing, SMT assembly, testing, and production follow up.

Get a Fast Quote for RO4450F High Frequency PCB

Planning a Rogers high frequency multilayer PCB build? Send your Gerber files, stackup requirement, copper weight, impedance target, surface finish, and quantity to EBest for a fast fabrication review. Our team can support high frequency PCB fabrication, DFM checking, multilayer stackup review, impedance control, PCB manufacturing, PCB assembly, component sourcing, and production testing. Contact us at sales@bestpcbs.com to get a quotation for your next RF or high speed PCB project.

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