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Isola P95 P25 PCB: polyimide construction and manufacturing
Review P95 laminate and P25 prepreg, distinguish HB from V-0 requirements, and compare free in-plane thermal expansion.
Share your current requirements and open questions. Tool use is optional.
What is an Isola P95/P25 PCB?
An Isola P95/P25 PCB uses P95 laminate cores and P25 prepreg in a rigid, glass-reinforced polyimide construction. The two names identify different parts of the material system. Specifying only 鈥減olyimide PCB鈥� leaves important questions unresolved: the precise laminate, bonding material, construction, flammability requirement and intended thermal mission.
The identifies the system as UL HB and reports typical Tg of 260掳C by DSC and Td of 416掳C by TGA at 5% mass loss. Its in-plane X/Y CTE entries are 13/14 ppm/掳C. These are material data, not a continuous operating-temperature declaration for a completed PCB assembly.
| System reference | Supplier information | Specification implication |
|---|---|---|
| P95 | Polyimide laminate core | Name the cured core construction |
| P25 | Matching prepreg system | Name the bonding material as well |
| Tg by DSC | Typical 260掳C | Preserve the measurement method |
| Flammability identification | UL HB | Do not relabel it as V-0 |
This page focuses on material-system identity and thermal-mechanical planning. Use the Isola PCB family guide when comparing this specialty system with epoxy-based options. The decision should follow the product requirements, rather than treating the largest Tg number as a universal ranking.
Specify the core and bonding material together
The cured laminate and prepreg serve different roles. A core carries an established dielectric and copper structure; prepreg bonds layers and fills features during pressing. The released stackup should name both, with the relevant glass styles, resin content, copper and proposed pressed dielectric dimensions.
Do not assume a generic epoxy prepreg can replace the specified P25 bonding system. Mixed-material construction is an engineering decision requiring compatible processing and performance review. A quotation should identify any proposed alternative before production, including changes to thermal behaviour, resin flow, electrical properties or approval scope.
This is a rigid glass-reinforced laminate system. It should not be confused with an unreinforced flexible polyimide film solely because both use the word polyimide. A flex circuit has different mechanical and construction requirements. Define the actual structure you need rather than relying on the resin-family name to communicate it.
Keep HB and V-0 requirements separate
P95/P25's supplier identification is HB. A drawing that requires V-0 cannot be satisfied by silently changing that designation in a quotation or treating all polyimides as equivalent. Another named system, such as P96/P26, is a different material choice and must be reviewed against the complete requirement before substitution.
Material recognition, finished-board requirements and end-product certification have different scopes. If flammability is part of the design requirement, identify the applicable material record, thickness or construction scope and the necessary product-level evidence. Do not imply that a material datasheet certifies 吃瓜tv, the assembled product or a particular end-use approval.
This distinction is useful early in purchasing. A precise requirement allows engineering to flag a conflict before material is ordered. It also prevents an apparently inexpensive quote from being compared with another proposal that includes a different approved material system and associated qualification work.
Compare free in-plane thermal expansion
Enter a common free span, the temperature interval, board X and Y CTE values and a comparison material's CTE. The tool reports each free expansion and the signed difference between the board and comparison. It is a sensitivity calculation below the modeled transition region, not a mechanical stress or solder-joint life solver.
Isola P95 P25 PCB Engineering Planner
For a 100 mm span and a 100掳C increase, X and Y values of 13 and 14 ppm/掳C produce free expansions of 130 and 140 碌m. An independently entered comparison value of 17 ppm/掳C produces 170 碌m. Board-minus-comparison differences are therefore minus 40 and minus 30 碌m: in this example the board would expand less if each piece were free.
The 17 ppm/掳C value is an illustrative input, not a specification for every metal support. Material orientation matters for the X and Y values. Real restraints, stiffness, fasteners, local heating and component attachments can convert free expansion differences into a much more complicated mechanical response. The tool does not calculate those constraints, warpage or fatigue.
Use the result to identify a question for mechanical review: which spans are constrained, which parts move together, and what temperatures do they actually see? Do not convert a small free-expansion difference into proof that a joint is reliable. Conversely, a nonzero difference is not automatically a failure prediction.
Describe the thermal mission before selecting polyimide
Separate fabrication exposure, assembly processing and service conditions. Identify temperature ranges, gradients, dwell periods, cycling and the required life or qualification method. A thermal mission may include both a brief manufacturing excursion and a long service exposure, and these should not be treated as the same requirement.
The Tg260 material guide provides context for transition terminology. It does not establish that every Tg260-labelled material is P95/P25 or that a PCB can operate continuously at 260掳C. The selected construction, components and actual application requirements govern the engineering decision.
Keep uncertainty visible. If the expected local board temperature is not yet measured or modeled, identify it as an open item. A material upgrade chosen to compensate for an unknown environment can add cost without resolving the real risk. It may also leave mechanical interfaces, connectors or components outside their own requirements.
Review handling and fabrication with the material guidance
The is a starting point for the fabricator's process review. The actual construction and equipment still require a validated process. This page does not prescribe a universal pressing cycle, storage condition or bake instruction from a simplified web summary.
Discuss moisture handling, storage and the time between relevant stages. Record how deviations will be evaluated. The material's condition and complete processing history matter alongside the nominal resin system. A high transition temperature does not remove the need for controlled handling or appropriate assembly procedures.
For multiple lamination stages, define the interconnection architecture and materials at each stage. Review copper balance, resin filling, dielectric dimensions and hole structures together. The multilayer PCB construction page is the next step when the layer arrangement itself needs development.
Keep electrical requirements in the polyimide review
Thermal motivation does not remove signal-integrity requirements. Specify controlled-impedance structures, relevant frequencies, route lengths and acceptable electrical evidence. Product-summary dielectric values should retain their measurement conditions, while the field model needs data suitable for the actual glass/resin construction and geometry.
An alternative material can alter electrical behaviour even if its thermal properties appear attractive. Recheck the approved stackup and geometry before treating it as a drop-in replacement. If the project combines different material families, identify where the electrical environment changes and what model or measurement will validate those transitions.
Use the PCB impedance engineering page for the related geometry task. The expansion tool on this page deliberately does not calculate impedance, loss or propagation delay. Keeping those tasks separate prevents one result from being mistaken for overall material approval.
Build an acceptance plan around the actual risk
| Requirement to establish | Evidence to agree before quotation |
|---|---|
| Correct material system | Named core/prepreg, revision and material traceability |
| Correct construction | Released stackup and appropriate dimensional records |
| Interconnection quality | Agreed hole inspection and relevant electrical testing |
| Thermal suitability | Construction or product qualification for the stated mission |
| Flammability scope | Applicable material and end-product requirements |
Avoid accepting a generic certificate as an answer to every row. Determine what each record demonstrates and how it will be associated with the delivered order. A photograph supports product explanation, but it does not establish a material lot, current inventory or qualification result for your design.
For a repeat build, retain the approved construction and evidence scope. Any change to core, prepreg, copper or process should follow the agreed change-control route. If an alternative is proposed because of procurement, ask which parts of the electrical, thermal and approval review must be repeated.
Prepare a P95/P25 manufacturing budget and RFQ
The quotation depends on the exact polyimide construction, material procurement, layer structure, copper, holes, processing and requested evidence. Small quantities can carry significant one-time or material-lot costs. A generic FR-4 price multiplier is not a reliable substitute for a construction-specific proposal.
Isola P95 P25 PCB Budget Brief
Leave cost allowances blank to produce a technical brief. If you have a dated quotation or internal allowance, enter the unit, setup and verification scope explicitly. The calculator totals your numbers and does not claim a current polyimide price, stock position or lead time. Changing project dimensions or construction clears the previous cost allowances.
For a direct inquiry, provide P95/P25 identification, drawing revision, layer map, copper, quantities, thermal mission and flammability requirement. Flag any open approval or alternative-material questions. Send those details through Contact so the manufacturing review can address the real construction and evidence needs.
P95/P25 engineering questions
Is P95/P25 a flexible PCB material?
It is a rigid, glass-reinforced polyimide laminate/prepreg system. Flexible polyimide films are a different construction category. Specify the intended structure and mechanical requirements instead of assuming the resin name defines the board format.
Does Tg260 prove suitability for continuous 260掳C use?
No. The cited Tg is a DSC transition measurement. Continuous service requires evaluation of the actual material construction, components, environment and relevant qualification. The calculator also provides no operating-temperature or lifetime approval.
Can P96/P26 replace P95/P25 to meet V-0?
Treat it as a proposed change of material system, not a relabeling. Check the actual flammability scope, electrical and mechanical requirements, processing and customer approvals. A substitution must be reviewed for the complete product requirement.
Does negative mismatch mean the board is compressed?
The sign only states that the freely expanding board would grow less than the freely expanding comparison material in this model. Actual stress depends on how the parts are attached and constrained. Free-expansion arithmetic does not determine the stress state.
Request P95 P25 PCB manufacturing review
Send the named laminate and prepreg, drawing revision, stackup, quantities and required evidence. Identify open material, construction or qualification questions so engineering can prepare a useful manufacturing proposal.
Attach a downloaded tool brief manually. Contact does not automatically receive these inputs. References reviewed September 2026. Illustrations use planning examples; photographs do not establish prices, delivery times or project-specific acceptance.