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Use the method-qualified thermal record

The manufacturer model information for R-1766(GH) lists a DSC and TMA Tg of 140掳C, with a different DMA value. These are transition measurements. They should not be presented as a universal maximum temperature or compared indiscriminately with another method.

The material's delamination and decomposition data have their own conditions. If the actual board requires a demanding assembly history, obtain a construction-specific review rather than relying on a generic high-heat title from a supplier website.

Construction decisions at a glance

Preserve the core and prepreg identity

The manufacturer associates the GH core with a defined bonding designation. Keep the full name, source revision, glass and copper with the purchase requirement. An abbreviated R-1766 entry may not describe every suffix-specific construction.

The R-1705 double-sided guide covers a separate dimensional task. A familiar glass-epoxy category does not establish that the products share the same supplied thickness convention, bonding behavior or approved drawing scope.

Reconcile supplied thickness without double counting

The tool adds dielectric-only core thickness and copper on each face. A hypothetical 0.20 mm dielectric plus two 18 碌m foils gives 0.236 mm over copper. The example is not an R-1766(GH) stock item.

If the quoted dimension already includes copper, use the original convention rather than adding it again. Define whether the finished-board acceptance measurement includes plating, finish or mask. Keep pressed prepreg dimensions separate from the supplied core accounting.

Core supply thickness reconciliation

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 吃瓜tv quotation. You can contact the team without completing it.

Choose an alternative for a documented reason

The HIPER D guide discusses a different thermal material route. It can be considered when the actual process requirements justify a change, but should not be offered as automatically interchangeable with the original GH construction.

The HIPER M guide adds a hole-geometry perspective. Material, hole dimensions and copper form a system. Replacing the resin does not independently resolve insufficient land allowance or a poorly controlled plated-hole process.

Keep electrical assumptions tied to the layer

Use the frequency and method appropriate to the circuit when selecting dielectric inputs. A low-frequency catalog value does not establish high-speed line loss or microstrip effective Dk. Identify the actual signal layers and their surrounding construction.

For a repeat build, compare the new proposal with the last approved stackup and inspection requirements. An undocumented change in copper, glass or core thickness can matter even when the material family name appears unchanged.

Ask for a bounded fabrication review

Provide the exact GH callout, drawing and source revision, layer map, copper, board dimensions, quantity and thermal assembly history. State whether exact supply is mandatory or whether an alternative may be proposed for approval.

The optional allowance comparison uses entered quote figures and does not infer price from a thermal label. Keep qualification and inspection scope consistent. A useful supplier response should explain the actual construction and open requirements, rather than repeating an unsupported promise of high-temperature performance.

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.