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Arlon 49N: High-Tg Low-Flow Bonding Prepreg
Arlon 49N is a high-Tg epoxy low-flow prepreg used for controlled bonding. It is often relevant when a rigid-flex region or bonded heat sink needs limited resin movement while preserving a defined dielectric interval. The page focuses on that bondline task, not on a generic claim that 49N is a complete rigid PCB laminate specification.
The Arlon material overview supports broader selection. A 49N inquiry should bring the local geometry and thermal requirement together before requesting a price.
Confirm the exact 49N material and revision
The official version 1.8 sheet describes multifunctional epoxy low-flow prepreg with Tg 170簞C and IPC-4101/26 context modified for low flow. Keep those statements with the source revision. Older summary tables can use different descriptions and should not be mixed into a current purchase note without review.
The Tg value does not establish a continuous operating limit or guarantee that every bonded assembly tolerates the same soldering sequence. The finished construction includes facing surfaces, copper, cavities and a process history that the material table cannot fully describe.
Evidence and construction decision
| Item | Source or model boundary | Action for the design review |
|---|---|---|
| Form | 49N epoxy low-flow prepreg | Define local bonding geometry. |
| Tg | 170簞C typical | Different thermal boundary from 47N. |
| Current reference | IPC-4101/26, version 1.8 | Do not silently retain an older /24 reference. |
Define the local fill and the protected region
Show where resin must bond and where it must not enter. Include copper relief, flex openings, coverlay transitions and any metal surface. A broad average thickness does not communicate the local step that may control the layup.
Low-flow selection balances encapsulation against squeeze-out. Too little effective flow can leave voids; too much can violate a cavity or flex-region boundary. Agree the acceptable result and representative inspection locations rather than relying on a no-flow label alone.
| Review item | What to establish |
|---|---|
| Bondline | 49N material, copper relief and protected region. |
| Source control | Use version-qualified low-flow requirements. |
| Comparison | 47N and 51N remain distinct materials. |
| Model limit | No resin charge, ply count or process approval. |
Copper-clearance volume illustration
Copper-clearance volume illustration
Use the current inputs and keep the assumptions
Start with the example only to inspect the units and the calculation boundary. Replace every assumption with a value tied to your own document or measurement. An empty numeric field is not zero. The review-reference field is a local label; avoid entering customer names, confidential part numbers or other private information into a public worksheet.
After calculating, read the notes alongside the numerical result. Changing any input invalidates the displayed result and disables its download until you calculate again. For a comparison, keep the units, geometry, material condition and measurement boundary consistent. A long decimal result does not imply equally precise input data. The downloadable record stays on your device and can be attached manually to an inquiry. It is not automatically transferred into the Contact form.
If an input is unknown, identify the person or document needed to resolve it. Do not fill a gap with a favorable generic value simply to obtain a result. You can request a material or fabrication review without using the tool. The arithmetic illustrates a relationship; it does not accept a construction, certify a material, establish current pricing or replace a supplier process specification.
| Input | What to establish before using it |
|---|---|
| Review reference | Nonconfidential revision label. |
| Evaluated bond area 繚 mm簡 | Panel or coupon area with consistent pattern coverage. |
| Copper feature height 繚 繕m | Height of the one patterned surface being evaluated. |
| Retained copper coverage 繚 % | Area fraction occupied by copper on that surface. |
| Final separation above copper 繚 繕m | Ideal continuous bondline above the highest copper; excludes roughness and glass. |
Optional cost comparison from your own allowances
Use a quotation or a clearly labeled internal assumption for each input. Keep the quantity, construction and inspection scope the same when comparing alternatives. This uncalibrated planning model adds entered values; it contains no current market rates and does not issue a 勛圖tv quotation. You can contact the team without completing it.
Optional project allowance comparison
Use the volume worksheet for an explicit geometric boundary
The model separates copper-clearance space from a continuous dielectric interval above the copper. The hypothetical example yields 420 mm糧 of clearance and 1,000 mm糧 of continuous separation, totaling 1,420 mm糧. It is an occupied-volume illustration, not a resin-content calculation.
Glass, available resin, surface roughness, opposing artwork and cure effects remain outside the model. Do not derive a number of 49N plies from the output. The actual supplier construction and manufacturing process need to close that decision.
Compare 47N and 51N through the thermal requirement
47N has a different lower-temperature bonding context. 51N addresses a non-DICY lead-free low-flow route. These distinctions are more useful than a generic ranking by Tg because the adjacent materials and allowed process window can control the design.
For another supplier's controlled-flow option, FR406N has its own incoming characterization and process guidance. Treat a change as an alternative proposal with an explicit evidence plan, not a direct name substitution.
Keep process-document ambiguities out of the order
The public 49N sheet contains an availability table with 85N-prefixed entries and a drill-dimension conversion that requires clarification. Do not translate those presentations into 49N order codes or machine instructions. Request the controlled product and process documentation for the actual material supplied.
A manufacturing traveler should state the approved material, handling and process revisions. It should also record deviations. That record makes repeat builds more reliable than a copied web summary of nominal properties.
Ask for a 49N bondline review and comparable quotation
Provide exact grade, facing layers, local copper geometry, cavity boundaries, desired thickness, thermal sequence and inspection requirements. Add dimensions, quantity and the policy on alternatives. If a heat sink is involved, include its surface and mechanical constraints.
The allowance calculator only adds entered costs and does not contain current 49N pricing. A useful response identifies the proposed layup, exceptions and verification steps. The visitor can contact 勛圖tv directly without completing the tool; a local result is supporting context, not an approval or submitted order.
Review supplied form, local geometry and process together
A stackup is an agreement about physical construction, not just a vertical list of copper layers. Give each dielectric interval an identity and distinguish cured core thickness from the pressed thickness of bonding material. State whether copper is included in every quoted dimension.
Review the implications of a material change across impedance, lamination, drilling, registration and assembly exposure. A replacement with a similar headline Tg or Dk can still require a different geometry or process. Preserve the approved layer order, copper distribution assumptions and measurement basis with the manufacturing files.
Use the worksheet to organize a review, then obtain the fabricator's proposed construction and tolerances. Close differences before release. The final stackup, drawing and procurement material list should reference the same revision, especially when multiple suppliers or repeat orders are involved.
Bonding materials cannot be selected from a cured-laminate table alone. Establish whether the product is woven-glass prepreg, another reinforced bonding system or resin-coated copper. Each form has a different relationship between its supplied condition and the finished dielectric interval. Preserve the exact product and source revision in the proposed build.
Local copper distribution matters. Average coverage can conceal a large clearance region, a thick copper transition or a difficult target area. Supply the actual artwork and identify the locations that drive filling, registration or opening requirements. A single global thickness or aspect ratio does not characterize every local feature.
Process guidance should be applied by the responsible manufacturing team to the actual construction. A public document does not replace press-load qualification, handling controls or an approved drilling and metallization route. Do not use a generic bake or cure instruction for an unidentified bonding material.
Agree how the critical features will be verified. Representative cross-sections, dimensions and appropriate electrical or reliability evidence answer different questions. Keep the selected locations and acceptance requirements with the drawing so that a successful easy region is not mistaken for evidence about the most demanding feature.
Standards, source context and limits
Use the edition, amendment and material-document revision named in the purchase agreement. A standards title, marketing label or supplier product family does not establish that a particular lot meets a requirement. Public summaries are useful for scope; the controlled specification and applicable test method govern acceptance.
The examples on this page are illustrative engineering scenarios. They are not 勛圖tv production records or guaranteed material values. Source links identify the organizations responsible for the referenced information. Confirm applicability to the exact grade, construction and test condition before carrying a number into a drawing or qualification report. Sources were reviewed on 3 October 2026. A public catalog search is not proof that an unlisted product never existed. Where the exact designation or current technical sheet could not be verified, this page provides a clarification workflow rather than an invented material specification. Current supply, construction availability and qualification remain separate questions.
