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1080 or 2116: compare constructions, not labels

The useful comparison between 1080 and 2116 prepreg is a comparison of complete bonding constructions. Both names describe glass styles. Neither name uniquely establishes cured thickness, resin content, dielectric constant, reliability or price. Choose against the finished board requirements using the exact resin system, ply arrangement, copper context and validated processing information.

If the practical question is 鈥渨hich is thinner?鈥�, a manufacturer-specific construction table can answer it for the listed options. If the question is 鈥渨hich should we use?鈥�, thickness is only one input. A thinner bondline may help a routing target while increasing the importance of local copper topography and dimensional variation. More plies can change handling, purchasing and processing without guaranteeing a better result.

Use the 1080 material guide for thin-spacing sensitivity and the 2116 material guide for copper-distribution review. This page owns the substitution and comparison decision, so those pages can remain focused on their individual engineering tasks.

Build a comparison that can survive a design review

Start by placing both candidates in the same resin system wherever the intended comparison is the glass construction itself. Record the supplier, material designation, resin content, ply count and thickness definition. If the candidates come from different resin systems, label that as a broader material change. Do not attribute the entire difference to the weave number.

A comparison table is most useful when it exposes missing information. 鈥淣ot supplied鈥� is a better entry than a familiar number taken from another laminate family. Keep the document revision in the record so that another engineer can reproduce the decision later. If the data cannot be aligned, the correct next step is clarification rather than a ranked recommendation.

A product-specific thickness example

The provides multiple resin-content and thickness options for both styles. Use its named-product rows to frame the comparison, then confirm the proposed board construction with the fabricator.

A common shortcut is to compare one ply of each style while the actual stackup needs different ply counts. That shortcut may answer a catalogue question but miss the design question. Compare the complete proposed bondline, including the fabricator's thickness convention and the actual adjacent copper. If the published figures are test-construction values, ask how the fabricator translates them to the proposed board.

Do not confuse core and prepreg rows in the same data sheet. A cured core thickness and a bonding-sheet contribution are not interchangeable accounting entries. Also confirm whether copper is included in a core dimension. These errors can exceed the difference between the candidate prepreg constructions and make an otherwise careful comparison meaningless.

Compare entered bondline proposals

This worksheet compares only dimensionally compatible inputs. Confirm the same resin system and thickness basis to obtain the arithmetic. If the conditions differ or remain unresolved, the tool withholds the numerical comparison. That behavior prevents a polished output from disguising a data-quality problem.

Two plies versus one: what the arithmetic does not decide

Suppose a fabricator supplies illustrative additive pressed contributions of 77 碌m for a 1080 option and 138 碌m for a 2116 option under the same documented conditions. Two 1080 plies account for 154 碌m; one 2116 ply accounts for 138 碌m. Against an illustrative 150 碌m target, their nominal deviations are +4 碌m and 鈭�12 碌m respectively.

Those results do not declare the two-ply option the winner. The target may have a tolerance; the two constructions may have different uncertainty; copper filling and process suitability still need review. A nominal value closer to the target can have a less suitable lower-bound spacing. Request the applicable finished dimensional interval for each complete proposal before making a release decision.

The cost comparison also changes when the ply count changes. With equal panel area, two plies consume twice the sheet area of one ply before considering purchasing yield and price differences. That does not imply twice the total PCB cost, because cores, copper, imaging, drilling, plating, finishing and testing are separate contributors. Keep material-area arithmetic and the completed-board quote in separate columns.

Why resin percentage cannot choose the winner

Resin content describes a proportion in the specified prepreg. It does not state how much resin will remain in every local region after lamination, how the material flows during a particular cycle or whether a dense copper feature will be adequately filled. Comparing percentages without the glass construction, material definition and process context can therefore reverse the apparent conclusion.

Consider two adjacent copper layers with different retained-copper coverage. Sparse copper creates more recessed area below the copper top surface; a dense region creates less. The distribution within each region and the relationship between opposite faces matter as well. A global coverage percentage cannot show an isolated large clearance next to a fine feature, so artwork remains part of the review.

The designer should identify critical areas and the fabricator should evaluate the proposed bonding construction against them. Request the accepted thickness and filling evidence, rather than prescribing a generic pressure or temperature recipe from an online table. The PCB lamination process guide explains the process context without turning this comparison page into a second manufacturing-process article.

Electrical comparison needs matching conditions

For an impedance-controlled board, keep the finished dielectric distance, copper shape, trace width, pair spacing and reference planes together. Changing the bonding construction can require a routing adjustment even when the overall board thickness stays constant. The relevant question is whether the revised structure meets the electrical requirements with an agreed verification approach.

A process Dk, a measured material Dk and an effective permittivity used for a transmission-line mode are not automatically the same input. Identify how the design value was selected, which frequency range matters and whether the model represents the actual stackup. Comparing two headline Dk values taken from different methods does not isolate the effect of 1080 versus 2116.

Glass distribution can matter for sensitive routes, but the style designation alone does not predict differential skew or insertion loss for a finished board. Conductor position, weave arrangement, routing orientation and the complete dielectric structure need appropriate analysis. Use the controlled-impedance engineering page for the electrical task and preserve the source assumptions with its result.

Choose the next action by the unresolved requirement

When the thickness target is the main issue, request complete candidate bondlines and their dimensional intervals. When local filling is uncertain, provide artwork and copper heights. When the issue is electrical performance, agree the model and representative coupon. When the proposal is driven by availability, identify whether the alternative changes only construction or also the resin family and qualification basis.

This decision structure keeps the review short without hiding uncertainty. Assign an owner to each open point and state what would close it. A comparison with three unresolved critical fields is still useful if it tells the team exactly which questions to send. A score out of 100 would provide less value unless the scoring rules were tied to actual project requirements.

Turn the comparison into an actionable RFQ

Describe the approved construction and any permitted alternatives in the fabrication package. Include board revision, layer order, critical dielectric distances, total thickness, copper requirements, quantity and required verification. If the material selection remains open, distinguish mandatory performance requirements from a preferred style. That gives the fabricator room to propose a supported construction without guessing which changes are acceptable.

Ask that the quotation identify the proposed material system, construction and exceptions. Compare lead time and scope on that basis. The PCB manufacturing service can receive the completed-board request; the individual 1080 and 2116 pages provide scoped material cost worksheets when you already have usable rate inputs. A supplier offer is more informative than a generic online price multiplier.

After approval, keep the comparison record with the released stackup. If a later order uses a changed construction, review the change against the original reasons for selection. This prevents a procurement substitution from silently invalidating an electrical model or a mechanical tolerance that was accepted during the first build.

Questions engineers ask when comparing 1080 and 2116