Bergquist Thermal Clad PCB Manufacturer: How to Find a Reliable Supplier

If you have specified Bergquist Thermal Clad on a PCB fabrication drawing and sent it out for quotes, you already know the problem: every shop comes back saying yes, they work with Bergquist. Some of them genuinely do. Others have the brand name on their capabilities page because it attracts enquiries, but their actual production uses commodity ceramic-filled IMS dielectric from a generic laminate supplier. For a commercial LED retrofit board at 12 V, that substitution might not matter. For an automotive LED headlamp module, an EV power inverter, or any design where the dielectric breakdown voltage, Tg, and UL recognition are locked design requirements — it matters a great deal, and the failure shows up in the field rather than at goods-in.

This article walks through how to find and qualify a reliable Bergquist PCB manufacturer: who the legitimate suppliers in the supply chain actually are in 2025, what to ask a prospective fabricator to separate qualified shops from commodity brokers, and what incoming inspection tells you whether you received what you specified. For the technical design side — dielectric grade selection, stackup design, thermal resistance calculations — the Bergquist PCB reference page covers the complete Thermal Clad product range.

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The Bergquist Thermal Clad Ownership Chain: What Every Engineer Should Know in 2025

Before you can evaluate a supplier, you need to understand the current state of the brand. Most published content on Bergquist PCBs is outdated in one critical way: the Thermal Clad product line has changed ownership twice since the original Bergquist Company operated it.

Originally launched as part of The Bergquist Company, and later Henkel Corporation, the Thermal Clad business was among the early pioneers in the development of insulated metal substrate (IMS) technology in the late 1980s. In 2014, Bergquist and its Thermal Clad division were acquired by Henkel, bringing global resources and reach. Then in 2021, a new chapter began — Polytronics Technology Corp. acquired the Thermal Clad division from Henkel and the TCLAD company was formed. Today, TCLAD operates from its 100,000 sq. ft. Innovation Center in Prescott, Wisconsin, supported by a team of over 200 employees.

What this means for sourcing is straightforward but almost never stated clearly in supplier literature: the authentic Thermal Clad laminate — the material that was originally developed and sold as Bergquist Thermal Clad — is now manufactured and supplied by TCLAD Inc., headquartered in Prescott, Wisconsin, with distribution operations in Europe and Asia. When an engineer says “Bergquist PCB manufacturer,” the correct modern interpretation is a PCB fabricator sourcing genuine TCLAD laminate from the TCLAD supply chain. The grade designations (HPL-03015, HT-04503, HT-07006, HT-09009, MP-06503, CML-11006) remain the same. The dielectric formulations, manufacturing process, and UL recognition are continuous from the original Bergquist Company.

This matters because there is currently a meaningful gap between suppliers that source authentic TCLAD laminate and suppliers that use the historical “Bergquist” brand name on their marketing while supplying unrelated generic dielectric.

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Why “Bergquist PCB Manufacturer” Is Not a Controlled Term

TCLAD does not operate a formally published, searchable list of approved PCB fabricators in the same way that Rogers Corporation maintains an authorised fabricator network. Any PCB shop can describe itself as a Bergquist PCB manufacturer by purchasing a quantity of TCLAD laminate at any point and listing the brand in their capabilities documentation.

The entire qualification burden therefore falls on the buyer. The relevant verification points are material authenticity (did the fabricator source genuine TCLAD-manufactured laminate, and can they document it?), process capability (can they laminate, etch, drill, via-isolate, and solder-mask an IMS board to the quality the design requires?), and quality systems (are their process controls and inspection adequate for the specific failure modes in MCPCB production?).

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Step 1: Understanding the Material Supply Chain

The first concrete step in finding a reliable Bergquist PCB manufacturer is understanding where in the supply chain the fabricator sits and how they source TCLAD laminate.

TCLAD sells laminate directly to PCB fabricators, and also through an authorised distribution network that includes Digikey, Mouser, and Arrow for standard grade/copper weight/base metal combinations. A fabricator with genuine TCLAD stock will be able to name their supply route (direct TCLAD purchase or named distributor), provide a TCLAD Certificate of Conformance with a lot number for the specific grade and production run, and in most cases confirm stock availability for the grade you have specified.

A fabricator substituting generic dielectric will either produce a house certificate referencing the grade name without traceable TCLAD lot numbers, provide vague answers about procurement lead times, or make no distinction between TCLAD-sourced and equivalent-spec materials. If a fabricator uses the phrase “equivalent to Bergquist” or “similar specification” in responding to a material requirement, treat that as a disqualifier unless you have explicitly approved an alternative material and the design does not depend on TCLAD-specific properties.

The practical first question to ask any prospective Bergquist PCB manufacturer is therefore: can you provide a TCLAD CoC with lot numbers at time of order, and what is your current stock lead time for this specific grade?

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Step 2: Evaluating MCPCB-Specific Process Capability

Authentic laminate sourcing is necessary but not sufficient. The fabricator also needs demonstrated process capability for IMS board construction. The following capability areas are specific to MCPCB and distinguish a genuinely qualified Bergquist PCB manufacturer from a standard FR-4 shop that has added IMS boards to its services without building the corresponding process.

Dielectric Void Detection

Ask how the fabricator detects voids in the laminated dielectric layer. Dielectric voids are the primary thermal failure mechanism in MCPCB — they create localised hotspots that cause premature component failure without any visible defect on the board surface. The correct answer involves C-SAM (scanning acoustic microscopy) on production lots, or cross-section coupon analysis on samples from each press lot. A shop that relies on visual inspection alone, or that cannot describe their void detection method, is running a process that cannot catch this failure mode.

Via Isolation Through the Metal Substrate

For any design with vias penetrating the metal layer — mounting holes, thermal vias, multilayer interconnects — the fabricator needs a documented resin-fill isolation process: drill oversized holes through the metal, fill with insulating resin, cure, re-drill to final diameter, then plate. This is not a standard FR-4 process step and cannot be improvised. If the fabricator has no experience with it, the board they produce will have vias shorted to the metal substrate.

Tooling for Aluminium Substrate

Standard carbide drill bits blunt within a few hundred hits on aluminium-base MCPCB. A qualified Bergquist PCB manufacturer uses diamond-coated tooling for drilling and routing operations on aluminium substrates, runs at adjusted feed and speed settings for the specific alloy, and replaces tooling at defined wear intervals. Ask the fabricator directly about their tooling specification for aluminium MCPCB. “Same tooling as FR-4” is the wrong answer.

Surface Finish Recommendation

Asking which surface finish a fabricator recommends for Bergquist MCPCB is a quick competence check. The correct answer is ENIG (electroless nickel immersion gold). HASL creates uneven surface topography through thermal shock during application, risks disbonding the thin IMS dielectric from the copper layer at the board edge, and provides inferior planarity for LED and power device thermal pads. A fabricator that recommends HASL as the default for Bergquist MCPCB is either not aware of the disbonding risk or is optimising for their own process convenience rather than your board reliability.

Table 1: Process Capability Questions for Evaluating a Bergquist PCB Manufacturer

Capability Area	Question to Ask	Red Flag Answer	Qualified Answer
Material authenticity	Can you provide TCLAD CoC with lot numbers?	House cert only, no TCLAD lot number	TCLAD CoC with lot, available at order confirmation
Dielectric void detection	How do you detect dielectric bond voids?	Visual inspection only	C-SAM or cross-section coupon per press lot
Via isolation	How do you isolate vias through the metal layer?	Blank answer or “same as FR-4”	Documented resin-fill, cure, re-drill process
Drilling tooling	What tooling do you use on aluminium MCPCB?	“Same carbide as FR-4”	Diamond-coated, defined change intervals
Surface finish recommendation	What surface finish do you recommend for this design?	HASL as default	ENIG — with explanation of HASL disbonding risk
Hipot test	Is hipot test standard on your MCPCB production?	Not performed	Yes — state the test voltage per IPC-6012
Solder mask over thick copper	How do you apply solder mask over 2–3 oz copper?	Single-pass standard LPI	Two-pass LPI — explicitly stated

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Step 3: Certifications That Actually Matter for Bergquist MCPCB

Certifications are not a guarantee of quality, but they establish the baseline of a fabricator’s quality system and indicate which markets they are genuinely equipped to serve.

IPC-6012 Class 2 vs Class 3

IPC-6012 is the qualification standard for rigid PCBs and includes specific provisions for metal-core PCB construction. Class 2 defines the minimum acceptance criteria for commercial and industrial boards. Class 3 specifies tighter tolerances and is required for automotive and high-reliability industrial production. Ask prospective fabricators which class they certify MCPCB production against. For LED lighting and consumer applications, Class 2 is acceptable. For automotive, medical, and safety-critical industrial designs, request Class 3 explicitly.

UL Recognition for the Finished Board

TCLAD Thermal Clad laminate carries UL recognition for specific grade and construction combinations. When a fabricator builds a board using authentic TCLAD laminate in a qualifying construction, the finished board inherits the UL material recognition from the laminate. This matters for end products requiring CE, UL, or CSA marking, where the PCB laminate must be demonstrably within a UL-recognised listing. A fabricator using generic dielectric that is not itself UL-recognised breaks the compliance chain for the end product.

IATF 16949 for Automotive Applications

For any automotive supply chain application — EV modules, LED headlamps, ECU boards, ADAS power stages — IATF 16949 is the automotive-specific quality management standard. It covers the traceability, PPAP documentation, process control, and continuous improvement requirements that automotive OEM customers impose on their tier-1 and tier-2 supply chain. ISO 9001 alone is not an adequate substitute for IATF 16949 in automotive MCPCB supply.

Table 2: Minimum Certification Requirements by Application

Application	IPC Class	Quality Standard	Additional Requirement
Commercial LED lighting	Class 2	ISO 9001	RoHS, UL material recognition
Industrial power electronics	Class 2–3	ISO 9001	Hipot documentation, CoC on file
Automotive (non-safety)	Class 3	IATF 16949	PPAP capability, AEC-Q200 material context
Automotive safety-critical	Class 3	IATF 16949 + FMEA	Lot traceability, 100% electrical test, hipot mandatory
Medical devices	Class 3	ISO 13485	Full process validation records, lot traceability
EV power modules (800 VDC)	Class 3	IATF 16949 preferred	High-voltage hipot per design requirement, lot CoC

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Step 4: Writing an RFQ That Filters Suppliers Automatically

The RFQ document is the most efficient qualification tool available. A generic RFQ — “1-layer aluminium MCPCB, Bergquist HT grade, 1 oz copper, ENIG” — gets responses from every shop that has “Bergquist” on its website, qualified or not. A tightly specified RFQ forces genuine engagement with the specification or causes unqualified suppliers to self-select out.

A well-specified Bergquist PCB manufacturer RFQ includes the following:

The exact TCLAD grade designation by name (e.g., “Bergquist Thermal Clad HT-07006, TCLAD-manufactured, authenticated TCLAD CoC required as delivery hold point — no substitutions accepted without prior written approval”). The base metal alloy and thickness with tolerance (“aluminium alloy 5052-H34, 2.0 mm ± 0.1 mm”). Copper weight on each circuit layer. Surface finish with plating thickness specification (“ENIG per IPC-4552: Ni 3–5 µm, Au 0.05–0.1 µm”). IPC-6012 Class (2 or 3) specified explicitly. Hipot test voltage and acceptance criteria (“100% hipot at 3 kVAC minimum between copper circuit layer and baseplate per IPC-6012”). Solder mask specification with note on thick-copper processing if relevant. Panel size, UL marking requirement if applicable.

Fabricators that respond with a complete quote addressing every line item, ask clarifying questions about specific parameters, and state their process explicitly for the IMS-specific steps are the ones worth qualifying further. Fabricators that quote a generic aluminium PCB price without engaging with the specific grade or process requirements are signalling that they will not be tracking those requirements in production either.

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Step 5: First Article Inspection — Verifying the Boards You Actually Received

Even from a qualified fabricator, first-article inspection on the initial production lot is non-negotiable for applications with demanding specifications. The test programme does not need to be elaborate, but it must cover the failure modes that are specific to MCPCB and that visual inspection alone cannot detect.

Table 3: First Article Inspection Test Plan for Bergquist MCPCB

Test	Method	Target	What It Catches
Material CoC verification	Review TCLAD lot numbers vs order spec	Exact grade match	Material substitution, grade error
ENIG plating thickness	XRF measurement, ≥5 pads per board	Ni 3–5 µm, Au 0.05–0.1 µm	Thin Ni (corrosion), excess Au (brittle solder)
Hipot test	Cu layer to baseplate, ramp to spec voltage	Hold for 60 s, no breakdown	Dielectric void, disbond, contamination
Thermal resistance spot-check	Resistor heater + thermocouple on baseplate	Within ±30% of TCLAD grade spec	Dielectric void, material substitution
Cross-section coupon	Microsection at via and dielectric interface	IPC-6012 plating thickness, no voids	Via plating quality, laminate void location
Solder float test	260 °C solder bath, 10 s per IPC-TM-650	No delamination, no blistering	Solder mask adhesion, dielectric bond integrity
Dimensional inspection	IPC-6012 per drawing	Board outline, hole diameter, annular ring	Routing quality, drill accuracy

The thermal resistance spot-check is the one that many incoming inspection programmes omit and that catches material substitution most directly. A genuine TCLAD HT-07006 board will show a dielectric thermal resistance around 0.11 °C·in²/W under measurement. A commodity 1 W/m·K generic dielectric at the same thickness will measure 2× or more that value. The measurement takes less than 20 minutes with a small resistor and two thermocouples and provides a data-driven confirmation that the thermal performance you designed for is present in the physical board.

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Useful Resources for Bergquist PCB Manufacturer Qualification

Resource	Description	Link
TCLAD Inc. — Official Thermal Clad Successor	Current manufacturer of authentic Thermal Clad IMS laminate; contact for distributor list	tclad.com
Bergquist Thermal Clad Selection Guide	Grade specifications, test methods, processing guidelines (Henkel-era PDF, still current for grade data)	Digikey PDF
IPC-6012 Rigid PCB Qualification Standard	MCPCB-specific acceptance criteria, Class 2/3 plating minimums, hipot requirements	IPC.org
IPC-4552 ENIG Specification	Nickel and gold plating thickness standards for ENIG surface finish	IPC.org
IATF 16949 Automotive QMS Standard	Automotive quality management requirements for supply chain qualification	iatfglobaloversight.org
ASC International — US MCPCB Fabricator	US-based qualified MCPCB fabricator explicitly listing TCLAD/Bergquist as a stocked material	asc-i.com
NCAB Group IMS PCB Guide	Fabrication constraints, DFM rules, material selection for IMS production	ncabgroup.com

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5 FAQs: Finding a Reliable Bergquist PCB Manufacturer

Q1: Is there an official list of Bergquist or TCLAD-approved PCB fabricators I can use as a starting point?

TCLAD does not maintain a publicly searchable register of approved PCB fabricators in the same way that Rogers Corporation operates an authorised fabricator network. The most direct route is to contact TCLAD Inc. directly through their website (tclad.com) and ask for a list of qualified fabricators in your region. TCLAD has sales and technical support in North America, Europe (TCLAD Europe GmbH in Germany), and Asia (TCLAD Technology Corp. in Taiwan), and their sales team can direct you to fabricators with documented TCLAD laminate sourcing relationships. This is a more reliable starting point than searching for “Bergquist PCB manufacturer” and evaluating responses cold.

Q2: How do I know whether a Chinese MCPCB manufacturer is using genuine TCLAD laminate or a substitute?

The document trail is the primary verification. Require the TCLAD material Certificate of Conformance with lot numbers before production commences, and ask your TCLAD distributor or TCLAD’s Asia team to confirm that the lot numbers correspond to genuine TCLAD production. Physical verification on received boards includes ENIG plating XRF measurement as a proxy for overall process quality, thermal resistance measurement against the known grade specification, and hipot testing at a voltage that distinguishes genuine high-performance dielectric from commodity substitutes. A genuine HT-07006 board survives 11 kVAC hipot with margin. Many generic 2.2 W/m·K dielectrics at 6 mil thickness do not reach that breakdown voltage, which makes a stringent hipot specification one of the most effective material authentication tests available in incoming inspection.

Q3: Should I qualify one Bergquist PCB manufacturer or maintain two qualified sources?

For production volumes where a supplier quality excursion or capacity constraint would cause a material disruption to your own production line, maintaining two qualified sources is standard supply chain practice. The qualification overhead is significant — process audits, first-article inspection, thermal and hipot testing — but the insurance value justifies it for automotive, medical, and critical industrial applications. The practical minimum for most programmes is one primary supplier with a documented second source qualified to at least first-article level (inspection completed, process audit passed) even if the second source is not receiving regular orders. For prototype and early-production phases, a single qualified source is usually acceptable provided the programme has a supply risk review before volume ramp.

Q4: What price premium should I expect for genuine TCLAD Thermal Clad PCBs compared to generic IMS boards?

At equivalent specification — same dielectric thickness, same copper weight, same base metal — genuine TCLAD laminate commands a material cost premium of approximately 30–60% over commodity ceramic-filled IMS dielectric from generic laminate suppliers. At finished PCB level, where laminate is one cost component alongside fabrication labour, drilling, plating, surface finish, and testing, this typically translates to a 15–30% higher unit cost for the finished Bergquist-spec MCPCB versus a generic MCPCB at nominally similar specification. The premium is most clearly justified in applications where the TCLAD-specific properties are design requirements: verified dielectric breakdown voltage, UL recognition, specific Tg for automotive temperature qualification, or confirmed thermal conductivity tied to a junction temperature calculation. In commodity LED board applications where any compliant 1 W/m·K IMS board is functionally adequate, the premium requires a clearer application-specific justification.

Q5: What is the minimum incoming inspection a small engineering team can realistically run on Bergquist MCPCB?

For a small team without dedicated test infrastructure, the practical minimum that provides meaningful protection is: CoC review with TCLAD lot numbers at goods-in (no equipment required, takes 5 minutes); hipot test at a defined voltage between the copper layer and the baseplate (a basic hipot tester costs under $500 and the test takes 2 minutes per board); and visual inspection under magnification for solder mask coverage, surface finish uniformity, and edge quality. If you can add one more test, XRF for ENIG plating thickness on 5 pads per lot provides a fast, non-destructive data point that catches the most common surface finish non-conformance. The full test plan described in Step 5 above is recommended for first articles and critical programme qualifications. The minimum above is an acceptable production lot check once the fabricator is qualified and performing consistently.

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Summary: The Qualification Framework for Bergquist PCB Manufacturers

Finding a reliable Bergquist PCB manufacturer is a supplier qualification exercise, not a price comparison exercise. The key points that separate a qualified sourcing decision from a risky one come down to three things.

First, understand that the authentic Thermal Clad laminate is now manufactured by TCLAD Inc. in Prescott, Wisconsin — not Henkel, and not Bergquist, which no longer operates as an independent company. Any supplier claiming “Bergquist material” should be providing TCLAD CoC documentation. Second, evaluate process capability against MCPCB-specific criteria — void detection, via isolation, aluminium tooling, hipot testing — not just the presence of the brand name in a capabilities list. Third, structure your RFQ and incoming inspection programme to lock down material authentication and verify thermal and dielectric performance on every meaningful lot.

The engineers who avoid field failures on MCPCB designs are not necessarily the ones with the best thermal models. They are the ones who close the loop between specification and delivery — who write RFQs that demand traceability, run incoming hipot on every production lot, and treat material authentication as a process step rather than an assumption.

For the complete Bergquist Thermal Clad grade overview, dielectric specifications, and design application guidance, visit the Bergquist PCB reference page.