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Resolve the 170°C and 180°C descriptions

At the time of research, the cited official product page contains a 170°C DSC headline while its property table lists 180°C DSC and 185°C DMA. This is a document-consistency issue, not permission to select whichever value fits a design. Obtain the current controlled TDS for the intended supplied grade and record the revision used for approval.

Keep typical characterization separate from purchase limits. A drawing requiring a minimum property needs an explicit acceptance basis; a typical table value is not automatically that limit. Preserve the source excerpt and supplier clarification with the drawing so that a repeat order does not reopen the same ambiguity.

Source-qualified material review

Treat the core and prepreg as different inputs

S1000-2 is the laminate designation and S1000-2B identifies its matched prepreg in the cited process documentation. A cured core and a B-stage bonding sheet enter lamination differently. Nominal prepreg thickness is not a guarantee of the final dielectric interval between patterned copper layers.

Specify the copper distribution, core thicknesses and intended finished separation. Thick internal copper and large clearance regions create a filling problem that cannot be solved by selecting a Tg alone. Where that is the actual issue, compare the task with SP175M special bonding prepreg; do not substitute products without a reviewed process and material decision.

Piecewise free thickness expansion

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 ³Ô¹Ïtv quotation. You can contact the team without completing it.

Connect thermal properties to the actual build

The cited page reports typical Td of 345°C at 5% mass loss and Z-axis expansion of 2.8% over 50–260°C. These are specimen measurements. The finished board adds holes, copper constraints and a processing history. A board with several assembly or rework excursions may need different evidence from a simple single-pass build.

List anticipated lamination, soldering and repair exposures without turning them into an unapproved recipe. Ask which reliability coupons or records represent the proposed construction. A broad high-Tg description does not independently qualify a thick board, a high aspect-ratio hole or a sequential build.

Illustrate expansion without pretending to predict life

The worksheet accepts thickness, starting and final temperatures, transition temperature and two CTE values. It integrates the entered intervals and reports free thickness change. Changing the temperature range can be as important as changing the material coefficient, which is why comparing isolated CTE figures is often misleading.

Use the example only to understand the arithmetic. It contains hypothetical values and does not preload a source-qualified S1000-2 material model. Actual interconnect stress requires the constrained geometry and copper behavior. A lower calculated free expansion does not establish a number of acceptable reflow cycles or a service-life advantage.

Compare a neighboring grade through the drawing

The S1000 mid-Tg page covers a different material identity. If procurement proposes S1000-2M, obtain its own data and construction rather than carrying over the S1000-2 table. If a legacy drawing says S1000-2H, resolve that exact designation before treating it as an approved high-Tg or halogen-free alternative.

Build a comparison around the requirements that can change the board: dimensional basis, dielectric design input, copper treatment, hole architecture, process compatibility and required records. Similar names and similar headline Tg values are not a complete equivalence assessment.

Quote the released scope, not a material nickname

For an inquiry, provide the material callout, stackup, copper weights, drill information, quantity and application conditions. Identify permitted substitutions and who approves them. Request a quote that names the proposed grade and any unresolved source-revision issue instead of silently quoting generic FR-4.

The optional allowance tool separates one-time and recurring amounts supplied by you. It does not know material inventory, yield or current market prices. Compare equivalent inspection and acceptance scopes, then retain the agreed stackup and material record with the manufacturing files for future orders.

Close the material and construction decision together

The finished board combines a dielectric, copper patterns, holes, surface coatings and a manufacturing history. Its behavior cannot be inferred from a family name alone. State the supplied grade, reinforcement, thickness, copper and processing conditions that matter to the intended application.

Keep handling and assembly requirements with the fabrication drawing. A thin panel, punched outline or unusual support condition can change the production route even when the electrical circuit is simple. Ask the fabricator to review the actual features and panel format rather than assuming a dimensional example represents a production capability.

For cost comparison, hold the drawing, quantity, test scope and acceptance requirements constant. Record one-time tooling separately from recurring work, and distinguish raw material utilization from accepted-board yield. Any calculator on this page uses supplied assumptions; an actual quotation requires the files and an agreed scope.

A source-qualified table should be read alongside the exclusions and footnotes, not separated from them. If the supplier limits an application, identify whether that limitation affects the current design before requesting a price. A familiar family classification does not override an explicit restriction, and a positive calculator result cannot remove it.

For a repeat build, compare the newly proposed supply with the previously approved material record. Exact grade, manufacturing site where relevant, foil treatment, reinforcement and dimensional basis can matter. Define which changes require notification and which need technical approval. This avoids turning a purchasing substitution into an unnoticed design change.

Receiving records should support the agreed identity and traceability requirement. A certificate for a raw material, a finished-board inspection report and an assembly test result cover different boundaries. Request the records that actually answer the project questions rather than collecting unrelated certificates.

When a source contains conflicting values, keep the discrepancy visible until a controlled revision or written supplier response resolves it. Do not create a new table by combining the most favorable entries from several sources. The released drawing, material list and quotation should all describe the same accepted construction.