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What KB-6150 laminate is鈥攁nd what its name does not specify

KB-6150 is a conventional, normal-Tg FR-4 laminate from Kingboard. The manufacturer鈥檚 currently linked technical sheet gives a typical DSC Tg of 132掳颁. It should not be described as a guaranteed 鈥淭g135鈥� material without a supporting purchase specification. This page focuses on KB-6150 identity, construction planning and the evidence needed to quote a board using it.

The existing URL is retained so drawings, bookmarks and earlier references remain useful. Selecting KB-6150 does not by itself define the finished PCB layer stack, assembly process or continuous operating temperature. Those requirements must be reviewed against the actual construction. The Kingboard PCB selection page covers the wider family when the grade is not fixed.

A conventional material can be a sensible starting point for an appropriate product. Equally, it should not be chosen simply because a board is only two layers or because a previous project used it. The useful question is whether documented material and manufacturing evidence address the new application鈥檚 exposures.

Source-controlled KB-6150 data

The following selected values come from the linked by the manufacturer. They are reference values for the stated specimen, not measurements of your delivered PCB. The source identifies a 1.6 mm specimen with eight 7628 plies and references IPC-4101E/21.

Keep the complete current source with the material record. Older sheets or a differently suffixed grade may show different figures. A number copied into a catalogue without its frequency, method and specimen can create a misleading comparison. The table is intentionally selective; it does not reproduce the entire supplier specification.

The source鈥檚 IPC designation identifies its stated material specification basis. It does not certify a finished board to an acceptance class, and it does not establish that a particular fabrication process has been qualified. Agree the applicable revision and requirements in the project documentation.

Translate supplied core thickness into usable design geometry

The thickness written on a core order may include both copper faces, or it may refer to dielectric only. That distinction matters when determining reference-plane spacing. If a hypothetical 1.600 mm clad core includes two 35 碌m copper faces, the dielectric is 1.530 mm. That is arithmetic under an explicit convention, not a claim that every 1.6 mm KB-6150 sheet uses that construction.

The same caution applies to finished-board thickness. Outer copper plating, bonding layers and other cores may be present in a multilayer board. A single core value cannot be reused as the whole stack thickness without checking the stack definition. Keep dimensions in one unit and identify where copper is included.

A thickness tolerance also needs an owner. The laminate supplier may specify a core tolerance, while the fabricator agrees a finished-board tolerance. Neither should be silently substituted for the other. A mechanical fit near a limit may need an actual measured stack or a controlled finished dimension rather than nominal catalogue arithmetic.

Core thickness and through-drill aspect-ratio worksheet

This worksheet performs two separate calculations. It converts between clad and dielectric thickness using the supplied copper values. It also divides the entered through-drilled board thickness by the drilled diameter, then compares that ratio with a review limit supplied by you.

The example uses an illustrative ratio limit; it is not a 吃瓜tv capability claim. A positive numerical margin does not confirm drilling quality, desmear effectiveness, plating coverage or plated-hole reliability. Confirm the fabricator鈥檚 definition and the exact diameter used. If a drawing specifies a finished hole after plating, obtain the corresponding drill definition before entering it.

Changing any input invalidates the old result and its downloadable brief. Use the example to understand the model, then start your project with documented values. Download and attach the brief manually if needed; it does not upload Gerber files or feed values into an online quotation automatically.

Hole geometry is a manufacturing discussion

A plated through hole is more than a cylinder in a laminate. The finished connection depends on drilling, hole-wall preparation, metallisation and copper quality, as well as the dimensions and material. A board with many small holes should therefore be reviewed using its actual drilled features and thickness distribution.

Distinguish through holes from blind or buried structures. The worksheet鈥檚 full-board ratio is not a model for every via type. A sequential build can have different drilled depths, process exposures and inspection requirements. Those details belong in the fabrication drawing and approved stack, not in a generic 鈥渉igh capability鈥� note.

If dimensions are still flexible, ask which changes would simplify the proposed construction before releasing the routing. A small change in a mechanical feature may be more useful than changing a material grade without understanding the bottleneck. The PCB DFM page provides a broader file-review path.

Review thermal exposure without inventing a service rating

KB-6150鈥檚 Tg does not mean the board can be operated continuously at that temperature. Conversely, a brief soldering peak above Tg is not assessed by comparing those two numbers alone. Time, cycles, moisture state, stack construction and process evidence matter. Request the actual assembly profile and identify any anticipated rework.

Consider a prototype that passes one assembly run but later receives additional rework and a different component population. Those changes can alter thermal exposure even if the laminate purchase line is unchanged. Record them as process changes. A material decision should not be carried across revisions without considering whether its assumptions still hold.

If a different thermal requirement is driving the decision, compare the KB-6165 construction guide and the High Tg PCB explanation. Neither page makes a blanket replacement recommendation. The project must still establish the required minimum properties and validation basis.

Use electrical values at their stated frequency

A catalogue dielectric constant is not automatically the design Dk for every layer, glass construction or frequency. For controlled impedance, specify the relevant dielectric spacing, copper geometry and reference planes, then work with an appropriate material model. Do not insert a 1 MHz value into a high-speed calculation merely because it is the first number in a table.

A finished board photograph cannot demonstrate its impedance, loss or laminate identity. Evidence comes from the design model, material records and agreed measurements. The PCB impedance guide is the next step when the trace geometry, tolerance or test coupon is the unresolved issue.

For a low-frequency control board, the most important question may instead be insulation, contamination, thermal cycling or mechanical fit. Avoid adding an impedance requirement to every net just because the laminate has a Dk value. Define tests around actual product needs and agree what constitutes acceptance.

Prepare a KB-6150 quotation without hiding scope

The material request should state KB-6150 explicitly and identify whether alternatives are permitted. Include quantity, dimensions, layer count, finished thickness, copper, surface finish and tests. A comparison with a different grade is meaningful only if the rest of the board and acceptance scope remain visible.

The cost worksheet uses your own per-board, setup and verification allowances. It does not contain current laminate rates. An estimate assembled from a previous quotation should state its date, quantity and exclusions. If those conditions no longer match, request new pricing instead of treating the old number as a market benchmark.

For a first build, separate tooling or setup from recurring board cost. State any requested material certificates, sectioning, special test coupons or inspection records. The unit cost should not already include a verification charge that is then added again as a batch allowance. An explicit scope is more valuable than a deceptively precise total.

Leave all cost inputs blank if your aim is simply to organise a technical request. You can go directly to PCB manufacturing or Contact with the drawing and unresolved questions. Engineering worksheets are optional aids, not gates to a quotation.

KB-6150 questions before release