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Pyralux AP8525R: Rigid-Flex Stackup Thickness
Pyralux AP8525R is a double-sided RA-copper AP construction associated with a 2 mil dielectric. The central task is to integrate that flex core into a complete rigid-flex or multilayer drawing. Layer order, local thickness and transition geometry matter more than a standalone laminate thickness figure.
Draw each physical region
Show separate sections for the flexible span, rigid region and any reinforced termination. The AP core may continue through all three while surrounding materials change. Mark coverlay ends, bonding boundaries and cavities where applicable. A single global stack table can hide a local overlap that interferes with fit or concentrates bending.
Construction and decision boundaries
| Review item | What this page establishes | What remains project-specific |
|---|---|---|
| Flex span | Core plus covering and copper | Define independent regional section. |
| Rigid area | Added rigid and bond materials | Use cured dimension basis. |
| Transition | Overlap and free-bend boundary | Geometry and process review together. |
Sum the section with tolerances
The worksheet accepts layer names, nominal thickness and positive lower and upper deviations. It sums a deterministic interval, not a statistical process capability. Enter a core dielectric and foil separately, or use an over-copper core dimension, but never both. Bonding intervals should use an agreed cured value rather than an unexamined incoming-film thickness.
| Review item | What to establish |
|---|---|
| Regions | Flex, rigid and termination sections |
| Dimensions | One thickness basis and cured bonding intervals |
| Transition | Coverlay and rigid-edge relationship |
| Limit | Layer sum does not qualify rigid-flex interconnects |
Stackup thickness interval sum
Stackup thickness interval sum
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. |
| Layer entries 繚 CSV | All dimensions in mm. Use each physical thickness once. Minus and Plus are positive absolute deviations, not percentages. |
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
Review the transition as a feature
The end of the rigid section defines where motion can start. Coordinate it with the coverlay overlap and any local stiffener. Inspect the installed free span for a tight fold at the exit. The design should show the intended tangent and clearance envelope so that the fabrication and mechanical teams discuss the same geometry.
Compare with a defined purpose
AP8515R addresses a thinner-base bend section; AP8555R addresses a thicker fixed-form construction. A single-sided AC182500 changes the electrical architecture. Do not present these as a cheapest-to-best ranking. Identify whether the constraint is routing, fit, motion or process compatibility before asking for an alternative.
Keep process exposure in the release
The flexible core may see several operations while the rigid build is completed. State the agreed material set and required inspection or qualification rather than assuming every polyimide combination follows the same route. Hole construction and copper distribution in the rigid region deserve their own review; a correct nominal thickness sum does not establish interconnect reliability.
Send an approval-ready stack question
Provide the region sections, layer data, rigid outlines, desired finished intervals and tolerances. Mark dimensions that are fixed by connectors or enclosures. Ask the supplier to return the proposed stack and open constraints before tooling. Cost comparisons should hold those regional requirements and test scope constant.
Approve three regional sections for the rigid-flex build
| Review point | Input to record | Decision or verification |
|---|---|---|
| Rigid area | Identify rigid cores, bonding layers and copper added around the flex core. | State the finished interval and measurement location for the assembled rigid region. |
| Transition | Dimension rigid termination, coverlay overlap and the start of permitted motion. | Review the worst positional combination at the transition, not only nominal boundaries. |
| Free flex | List only the layers continuing through the moving span. | Use this section for bending calculations instead of the overall rigid-board thickness. |
Use the review points above alongside the worked example on this page. Record the chosen inputs with the drawing revision and send unresolved items with the enquiry. A supplier response should identify the proposed construction and the evidence needed for release.
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. For a flex board, distinguish the design requirements in IPC-2223, finished-board qualification and performance in IPC-6013, and the material scopes of IPC-4202, IPC-4203 and IPC-4204. These cover different deliverables; naming them does not certify the material or factory. State the contracted revision and applicable material sheet. Source review date: 3 October 2026. Legacy designation, present availability and an approved replacement are separate questions.
For fabrication scope and the agreed construction requirements, see PCB manufacturing.