Engineer’s quick-turn guide to Bergquist MCPCB prototypes: choose HT-04503 vs HT-09009 vs HPL, prepare complete Gerber packages with MCPCB-specific fab notes, verify material stock, and get hi-pot certified boards faster.

Ordering a Bergquist MCPCB prototype is not the same as dropping a Gerber zip onto a commodity FR4 board service and hitting submit. The wrong material call, a missing fabrication note, or an ambiguous surface finish spec can push your lead time from 5 days to 3 weeks — or produce a board that fails hi-pot on the bench before you’ve even reflowed a single component. This guide walks through the entire ordering process the way an engineer who has done it before would explain it: what files you need, which Bergquist material to specify, where fabricators actually trip up, and how to compress turnaround time without cutting corners on quality.

Why Bergquist MCPCB Materials Require a Different Ordering Process

Most quick-turn fabricators stock one or two standard aluminum MCPCB laminates — typically a generic 1.0 W/m·K ceramic-filled epoxy dielectric bonded to 5052 aluminum. That covers a huge portion of the market. But Bergquist Thermal Clad materials — the HT series, HPL series, MP series, and CML series — are specified by engineers who need documented, certified dielectric performance, not just a thermal conductivity number on a marketing sheet.

When you specify a Bergquist product by name, you’re locking in a traceable supply chain. The dielectric breakdown voltage, peel strength, thermal resistance, and UL RTI rating come with lot traceability back to Henkel (which acquired Bergquist). Generic aluminum PCB laminates cannot give you that. For automotive LED modules, mains-connected LED drivers, and any board that needs UL or IEC certification, that traceability is not optional — it’s part of your compliance file.

The ordering process for a Bergquist MCPCB prototype, therefore, involves two parallel tasks: communicating the material specification clearly enough that your fabricator can source the correct laminate, and preparing Gerber files and fabrication notes that give the shop everything they need to process that laminate correctly.

Step 1: Select the Right Bergquist Thermal Clad Material

Before you write a single line in your fab notes, you need to confirm which Bergquist material is correct for your application. The most common point of confusion is between the HT series (high temperature, high voltage) and the HPL series (high power, thinner dielectric). Here’s the decision framework:

Bergquist Thermal Clad Selection by Application

Material	Thermal Conductivity	Dielectric Thickness	Breakdown (AC)	UL RTI	Best Application
HPL-03015	3.0 W/m·K	1.5 mil / 38 μm	2.5 kV	—	High-power LED, low isolation
HPL-04515	4.5 W/m·K	1.5 mil / 38 μm	2.5 kV	—	LED COB, dense arrays
HT-04503	2.2 W/m·K	3 mil / 76 μm	7 kV	140°C	Automotive, Class II PSU
HT-07006	2.2 W/m·K	6 mil / 152 μm	11 kV	140°C	Automotive, higher isolation
HT-09009	2.2 W/m·K	9 mil / 229 μm	20 kV	150°C	High-voltage auto, reinforced insulation
MP-06503	2.4 W/m·K	3 mil / 76 μm	—	130°C / 140°C	General power electronics
CML-11006	1.1 W/m·K	6 mil / 152 μm	10 kV	130°C	Multilayer MCPCB, industrial

The practical shortcut: if your board is mains-connected or referenced to a high-voltage bus, you need HT-04503 at minimum. If it’s in an automotive environment at continuous >130°C ambient, go HT-09009. If it’s a Class III or SELV-only LED lighting board running off a DC driver, HPL-03015 or HPL-04515 gives you the lowest thermal resistance with adequate isolation.

For applications requiring a different resin chemistry with specific CTE matching — satellite payloads, aerospace thermal cycling environments — look at Arlon PCB materials as an alternative dielectric family with different base chemistry.

Step 2: Prepare Your Gerber File Package

A complete Bergquist MCPCB prototype file package includes more than a standard FR4 Gerber set. Here’s what should be in your ZIP before you submit to any fabricator:

Required Files for MCPCB Prototype Submission

File / Document	Format	Notes
Copper layers	RS-274X Gerber	Top copper (GTL), inner layers if applicable
Solder mask	RS-274X Gerber	Top mask (GTS), specify color — white is standard for LED
Silkscreen	RS-274X Gerber	Top overlay (GTO)
Board outline	RS-274X Gerber or DXF	Must include all internal cutouts, slots, notches
Drill file	Excellon format	Include both PTH and NPTH in separate files
Fabrication drawing	PDF or DXF	Dimension callouts, material callout, layer stack-up
Fabrication notes	Text in fab drawing or separate PDF	Material spec, copper weight, surface finish, solder mask color, hi-pot requirement
IPC netlist (optional)	IPC-D-356	Enables bare-board electrical test fixture generation

The fabrication notes document is where most prototype orders break down. Generic fab notes written for FR4 will not communicate everything your MCPCB fabricator needs. MCPCB-specific fabrication notes must include:

Material specification line: State the exact Bergquist material by full product name — not “2.2 W/m·K aluminum PCB” but “Bergquist Thermal Clad HT-04503 on 5052-H32 aluminum, 1.6mm total board thickness.”

Hi-pot requirement: State the test voltage explicitly. For HT-04503 that’s typically 1,500V AC or 2,121V DC minimum; for HT-09009, 3,000V AC is a reasonable specification. Without a stated hi-pot requirement in your notes, many shops run whatever their default is.

PTH clearance callout: If your design has plated through-holes, state the required clearance from hole wall to metal core edge in mils, and specify resin plug fill for all PTH clearance zones.

Solder mask color: LED boards almost universally specify white mask for light reflectance. State reflectance requirements if you have them (>85% at 450nm is typical for quality LED board suppliers).

Surface finish and shelf life: ENIG (Electroless Nickel Immersion Gold) is the preferred finish for fine-pitch SMT. Specify “ENIG per IPC-4552” if you want a standardized gold thickness.

Step 3: Choose a Fabricator That Stocks Bergquist Material

This is where many engineers waste prototype cycles. Not every quick-turn PCB shop stocks Bergquist Thermal Clad material. If your fab has to order it from Henkel’s distribution channel, add 5–10 business days to your lead time minimum. Before you submit files, ask the fabricator directly:

“Do you have Bergquist [specific product name] in stock in the thickness and copper weight I need?”

If the answer is no or uncertain, you have three options: wait for them to stock it, find a fabricator who keeps it in inventory, or ask whether they can source it from a local distributor on an expedited basis.

Fabricators who handle significant MCPCB volume — shops serving the automotive, LED, or power electronics sectors — are far more likely to maintain Bergquist stock. General-purpose quick-turn shops that treat MCPCB as a specialty item will not.

What to Ask When Qualifying a Fabricator for Bergquist MCPCB Prototype

Question	Why It Matters
Do you stock this specific Bergquist material?	Lead time impact
What is your hi-pot test voltage for MCPCB?	Quality verification
Do you provide hi-pot test reports with shipment?	Compliance documentation
What is your minimum order quantity for prototypes?	Budget planning
Can you provide material certificates / CoC for the Bergquist laminate?	Traceability for certification
What is your quick-turn lead time for single-layer MCPCB?	Schedule planning
Do you perform AOI on MCPCB?	Defect detection

Step 4: Understand Realistic Quick Turn Lead Times

The phrase “quick turn” means something different for MCPCB than for FR4. Here’s what to expect based on board complexity and material availability:

MCPCB Prototype Lead Time by Complexity

Board Type	Standard Lead Time	Expedited (if material in stock)
Single-layer, standard HPL/HT	5–7 business days	3–4 business days
Single-layer, HT-09009 (thicker dielectric)	7–10 business days	5 business days
Two-layer same-side MCPCB	8–12 business days	6–8 business days
Multilayer MCPCB (CML series)	12–18 business days	10–12 business days
Copper-core MCPCB	15–20 business days	12–15 business days

Two things compress lead time most reliably: clean Gerber files with complete fab notes on first submission (no DFM iteration cycles), and a fabricator who physically has your Bergquist material on the shelf.

Step 5: Review the DFM Feedback Before Release

Reputable MCPCB fabricators will return a DFM (Design for Manufacturability) check before cutting material. For Bergquist MCPCB prototypes, the DFM items most commonly flagged include:

PTH clearance violations: Through-holes too close to the metal core edge. Fix: verify all PTH holes have ≥40 mil clearance from core edge and are called out for resin plug fill.

Trace-to-edge clearance: Copper traces within 0.5mm of the routed board edge create shorts after aluminum deburring. Fix: confirm ≥20 mil copper-to-edge clearance on all layers.

Missing hi-pot requirement: Shop cannot default appropriately without it. Fix: state test voltage in fab notes explicitly.

Undefined surface finish over bare aluminum edges: After routing, the exposed aluminum edge may or may not be masked — define it, don’t leave it ambiguous.

Solder mask color defaulted to green: If your fab notes don’t specify white, you’ll get green. Fix: state color and, if relevant, specify the minimum light reflectance value.

Accept no DFM feedback means either your files were perfect (possible) or the shop didn’t check carefully (more likely). Either way, review any modifications the shop proposes before approving release to production.

Step 6: Specify Your Required Test Documentation

For engineering prototypes going into certification testing or thermal validation, the documentation you receive with the boards matters as much as the boards themselves. Request the following:

Document	Purpose	When Required
Hi-pot test report (per board or per lot)	Confirms dielectric integrity	Always for HT-series
Material Certificate of Conformance (CoC)	Traces Bergquist laminate to lot number	UL/CE certification submissions
AOI report	Confirms copper pattern vs. Gerber	Complex layouts
Dimension inspection report	Board outline, hole locations, thickness	Tight mechanical integration
RoHS certificate	Confirms halogen-free / RoHS compliance	EU market products

For most development prototypes, hi-pot test report and a material CoC are the minimum. Don’t discover you need a CoC after the boards are built — it’s much harder to generate retrospectively.

Common Mistakes When Ordering Bergquist MCPCB Prototypes

Mistake	What Happens	Prevention
Specifying “Bergquist 2.2 W material” without product code	Shop substitutes a different laminate	Always use the full Bergquist product designation
Omitting hi-pot voltage from fab notes	Shop runs default test (may be too low)	State test voltage explicitly in notes
Submitting FR4-style fab notes	Missing MCPCB-specific requirements	Use an MCPCB-specific fab note template
Not confirming material stock before submitting	1–2 week delay waiting for laminate	Confirm stock verbally or via email before upload
Specifying HASL for fine-pitch QFN thermal pads	Uneven pad height causes voids	Use ENIG for any fine-pitch or thermal pad design
Omitting PTH clearance callout	Shop may not know your clearance tolerance	State clearance in mils explicitly in fab notes

Useful Resources for Bergquist MCPCB Prototype Orders

Resource	What It Provides	Link
Henkel / Bergquist Thermal Clad Selection Guide	Full specification matrix for all Bergquist Thermal Clad products, including HT, HPL, MP, and CML series with full electrical and thermal data	henkel-adhesives.com
Henkel TechniInfo Database	Searchable product data sheets including hi-pot, peel strength, and UL RTI for each Thermal Clad product	henkel-adhesives.com
IPC-4101 Standard	Specification for base materials covering metal-core laminate classification	ipc.org
IPC-6012 Standard	Qualification and performance standard for rigid PCBs including hi-pot testing requirements	ipc.org
Saturn PCB Toolkit	Free thermal resistance, trace width, and current capacity calculator — useful for validating your stack-up before submission	saturnpcb.com
Digikey Bergquist ThermalClad PDF	Original Bergquist product selector guide downloadable as PDF	media.digikey.com
FreeDFM by Advanced Circuits	Free online DFM check tool — useful pre-submission check, though not MCPCB-specific	freedfm.com

Frequently Asked Questions About Bergquist MCPCB Prototypes

Q1: Can I order a Bergquist MCPCB prototype from standard online PCB services like JLCPCB or PCBWay?

Some online services offer aluminum MCPCB options, but they typically stock generic laminates rather than named Bergquist products. If you need a traceable Bergquist HT or HPL material with a CoC, you will need to work with a fabricator who explicitly lists Bergquist Thermal Clad as a stocked material. For development prototypes where generic 1.0–2.0 W/m·K aluminum suffices, commodity online services are a reasonable starting point. For certification builds or automotive-grade prototypes, go to a qualified MCPCB house.

Q2: What is the minimum order quantity for a Bergquist MCPCB prototype?

Most qualified MCPCB fabricators accept orders from 1–5 pieces for prototypes. Some shops impose a minimum order value (typically $150–$300) rather than a minimum piece count. Panelization — running multiple board designs on one panel — can help hit the minimum order value while getting multiple prototype designs fabbed in the same run.

Q3: How do I verify that the fabricator actually used Bergquist material and not a substitute?

Request a material Certificate of Conformance (CoC) with every prototype order. A legitimate CoC will reference the Bergquist product designation, lot number, and Henkel as the material manufacturer. Some engineers also request a cross-section coupon — a destructive sample that shows the dielectric and metal layers in cross-section — for first-article builds. If the dielectric thickness doesn’t match the Bergquist spec, you know something was substituted.

Q4: My design has a mix of PTH connectors and SMT components. What extra notes should I include in my fab package?

For any PTH component in a Bergquist MCPCB, your fab notes must specify: (1) the required clearance from hole wall to metal core edge in mils — 40 mils is a common minimum, 50 mils preferred; (2) that the clearance annular region around each PTH is to be resin-plug filled with non-conductive epoxy, cured, and surface-planarized before hole plating; and (3) that you want the PTH filled regions confirmed in the DFM report. Missing these notes is the most common cause of hi-pot failures on MCPCB boards with through-hole components.

Q5: How much more expensive is a Bergquist MCPCB prototype compared to standard aluminum MCPCB?

Material cost for Bergquist Thermal Clad runs roughly 2–4x higher than generic Chinese-sourced aluminum dielectric laminates per square foot, depending on which product. In prototype quantities, that material premium often translates to a total board cost 30–60% higher than a generic aluminum MCPCB of the same size. However, the cost difference compresses significantly at higher volumes (500+ pieces), and the traceability, documented electrical performance, and UL compliance value of Bergquist material often justifies the premium in certified-product designs where substituting an unverified laminate would require re-testing.

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