Heavy copper PCB fabrication since 2002

Mission-Critical PCB Manufacturing.
Defending Precision.
Powered by Heavy Copper Plating.

Heavy and extreme copper circuits from 3 oz/ft² to 120 oz/ft², selective plate-up for multiple copper heights on one board, and engineering design review that gets the product right the first time. Built in a 30,000 square-foot facility in Chaska, Minnesota, USA.

Open RFQ Terminal Inspect the Copper Stack

Facility status

Registration: ITAR M25049
Quality system: AS9100D / ISO 13485
Extreme copper: up to 120 oz/ft²
Footprint: 30,000 sq ft, Chaska MN

Accepting RFQs for prototype and production

The Engineering Hub

Four disciplines. One board.

Pro-Tech is at the top of innovation for PCB heavy copper plating, developing heavy copper circuits with features of multiple copper heights on one board, alongside legacy products for computing, automotive, military, and industrial controls.

Close-up of printed circuit board traces and solder points

Heavy Copper Fabrication

3 oz/ft² to 120 oz/ft²

protechmn.com/heavy-copper

Pro-Tech specializes in heavy and extreme copper PCB production. Heavy copper circuits generally range from 3 oz/ft² to 20 oz/ft². Pro-Tech also manufactures extreme copper PCBs ranging from higher than 20 oz/ft² and up to 120 oz/ft².

Typical feature

Copper thickness, coplanarity

Formation

Vertical copper sidewall

Encapsulation

Solder mask, resin fill

Copper circuit traces on a printed circuit board

Selective Heavy Copper Plating

Multiple copper heights, one board

+Isolated plate up for individual component cooling
+Full via copper fill stitching for thermal transfer to heatsink
+Selective trace buildup to meet current flow requirements
+Selective PTH plate up for front to back current transfer

Multi-Layer Engineering

Reduced layer count through inner layer plate up

Double sided, max external: 170 microns
Multilayer, max internal: 137 microns
Min signal ratio: 1:1 maintained

Circuit board components and copper traces

Advanced Materials and Finishes

UL approved heavy copper stacks

protechmn.com

UL approved for heavy copper, 5 oz inners, 6 oz. Specialty power products with selective plate extreme copper up to 100 mil+ on outer layer copper and 160 mil internal slug designs. Processes are managed to meet the demands of producing heavy copper PCBs: line width and spacing formation, solder mask coating thicknesses, and drilled-routed features.

ComputingAutomotiveMilitaryIndustrial controlsMedical

Cross-section viewer

Dial the copper weight. Watch the stack respond.

Drag across Pro-Tech's published range. Heavy copper runs 3 oz/ft² to 20 oz/ft²; anything above 20 oz/ft² up to 120 oz/ft² is extreme copper. The model is proportional, not to scale, and exists to frame your RFQ.

3 oz6 oz/ft²120 oz

Class

Heavy copper

Approx. thickness

8.4 mil

Quote this stack

4-layer reference stackNot to scale

solder mask

prepreg / laminate

core

prepreg / laminate

solder mask

outer copper inner copper dielectric

4300 Peavey Road, Chaska

30,000 square feet on the forefront of PCB manufacturing technology.

2002

Heavy copper innovation since

120 oz

Extreme copper ceiling

USA

Made in Minnesota

// Security and regulatory framework

The Compliance Shield

Pro-Tech maintains aerospace, military, and medical-grade certifications so procurement can audit the Chaska facility before the first board is quoted.

Audit logs registry

Engineering and quality assurance

Design review is a core competency, not a courtesy.

Pro-Tech's team works diligently with its customers to fully understand new product designs. New designs are reviewed by our Senior Research and Development Team in CAM Engineers, Manufacturing Engineers and Sales Engineering teams to fully understand the manufacturing challenges. This allows detailed and timely communication back to the customer in the event there are any issues.

Pro-Tech's experience and comprehensive set of design rules lays the foundation for getting the product right the first time. Design review meetings are commonplace at Pro-Tech and viewed as a core competency to its business and customer service.

Engineer in lab uniform working on electronics at a workstation

Stage 01

CAM engineering review

Incoming Gerber and drill data is reviewed against Pro-Tech's design rule set before tooling begins.

Electrical engineer assembling a circuit board

Stage 02

Manufacturing engineering

Copper thickness, coplanarity, sidewall formation, resin fill, and mask encapsulation requirements are locked to process.

Technician examining a printed circuit board in an electronics lab

Stage 03

Sales engineering feedback

Issues are communicated back to the customer in detail and on time, before they become scrap.

Technician soldering a circuit board under lab lighting

Stage 04

Quality assurance tools

Cross-section and inspection documentation delivered under the AS9100D and ISO 13485:2016 quality system.

Direct line to the sales engineering team

Pro-Tech is proud of its exceptional sales team. Known for being accessible and responsive, their thorough printed circuit board fabrication knowledge is available to help you get the best possible product and service.

952-442-2189 800-404-9028 mbera@protechmn.com

CAD / Gerber RFQ terminal

Send the stack. Get an engineered quote.

Attach Gerber, ODB++, or fab drawings. Specify copper weight, layer count, and material. A sales engineer reviews every submission against Pro-Tech's design rules before pricing.