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Current IssueThe Hole Truth: Via Integrity in an HDI World
From the drilled hole to registration across multiple sequential lamination cycles, to the quality of your copper plating, via reliability in an HDI world is becoming an ever-greater challenge. This month we look at “The Hole Truth,” from creating the “perfect” via to how you can assure via quality and reliability, the first time, every time.
In Pursuit of Perfection: Defect Reduction
For bare PCB board fabrication, defect reduction is a critical aspect of a company's bottom line profitability. In this issue, we examine how imaging, etching, and plating processes can provide information and insight into reducing defects and increasing yields.
Voices of the Industry
We take the pulse of the PCB industry by sharing insights from leading fabricators and suppliers in this month's issue. We've gathered their thoughts on the new U.S. administration, spending, the war in Ukraine, and their most pressing needs. It’s an eye-opening and enlightening look behind the curtain.
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Measuring Multiple Lamination Reliability for Low-loss Materials
April 4, 2022 | John Strubbe, Taiwan Union Technology CorporationEstimated reading time: 2 minutes

Taiwan Union Technology Corporation (TUC) provides copper-clad laminates and dielectric resin composites used to manufacture printed circuit boards. The enthalpy of these resin composites meets and exceeds customers’ objectives and shows the deterioration of the resin’s physical properties as a result of multiple lamination cycles (up to 10X). This article describes how TUC evaluates the possible change in resin structure due to multi-thermal laminations.
Polymer Degradation Based on Stress-Strain Curve
The curve describes the method of measuring polymer degradation using tan ? (tan delta)—ratio of G'' to G'. With regard to material compounds of synthetic macromolecules, the degradation is evaluated by measuring the resin composite interfaces and adhesion, and how they collectively play a role in determining the properties of the polymers during processing. The strength of polymer-polymer interface between polymers depends on the structure that develops during its formation.
The accumulating cycles on these resin composites can be analyzed by applying the principles of the stress-strain curve, a graphical representation of the relationship between stress (derived from measuring the load applied on the sample), and strain (derived from measuring the deformation of the sample).
The stress-strain curve provides design engineers with a long list of important parameters needed for application design. It is obtained by gradually applying load to the sample and measuring the deformation. These curves reveal many properties of a material, such as the Young’s modulus, the yield strength, and the ultimate tensile strength. Laboratory instruments are used to assess these responses, otherwise known as viscoelastic properties, under conditions of low mechanical force. Controlled heating and cooling are incorporated to study temperature effects on polymer stiffness and resiliency.
Method of Assessment
In this evaluation, we used dynamic mechanical analysis (DMA) to study and characterize storage modulus (E'), loss modulus (E''), and loss factor tan (delta) as a function of temperature. This is all captured by applying the glass transition temperature of resin composites.
From the elastic and storage modulus, we can calculate tan delta—ratio of G'' to G'—showing the relative degree of damping of the material. This is an indicator of the material’s efficiency in preventing energy loss from molecular rearrangements and internal friction. Tangent of delta, or tan delta, quantifies the way in which a material absorbs and disperses energy. It expresses the out-of-phase time relationship between an impact force and the resultant force transmitted to the supporting body, whereas loss modulus and storage modulus are attributes to the given tan delta.
To read this entire article, which appeared in the March 2022 issue of PCB007 Magazine, click here.
Suggested Items
Copper Price Surge Raises Alarms for Electronics
07/15/2025 | Global Electronics Association Advocacy and Government Relations TeamThe copper market is experiencing major turbulence in the wake of U.S. President Donald Trump’s announcement of a 50% tariff on imported copper effective Aug. 1. Recent news reports, including from the New York Times, sent U.S. copper futures soaring to record highs, climbing nearly 13% in a single day as manufacturers braced for supply shocks and surging costs.
I-Connect007 Editor’s Choice: Five Must-Reads for the Week
07/11/2025 | Andy Shaughnessy, Design007 MagazineThis week, we have quite a variety of news items and articles for you. News continues to stream out of Washington, D.C., with tariffs rearing their controversial head again. Because these tariffs are targeted at overseas copper manufacturers, this news has a direct effect on our industry.I-Connect007 Editor’s Choice: Five Must-Reads for the Week
Digital Twin Concept in Copper Electroplating Process Performance
07/11/2025 | Aga Franczak, Robrecht Belis, Elsyca N.V.PCB manufacturing involves transforming a design into a physical board while meeting specific requirements. Understanding these design specifications is crucial, as they directly impact the PCB's fabrication process, performance, and yield rate. One key design specification is copper thieving—the addition of “dummy” pads across the surface that are plated along with the features designed on the outer layers. The purpose of the process is to provide a uniform distribution of copper across the outer layers to make the plating current density and plating in the holes more uniform.
Trump Copper Tariffs Spark Concern
07/10/2025 | I-Connect007 Editorial TeamPresident Donald Trump stated on July 8 that he plans to impose a 50% tariff on copper imports, sparking concern in a global industry whose output is critical to electric vehicles, military hardware, semiconductors, and a wide range of consumer goods. According to Yahoo Finance, copper futures climbed over 2% following tariff confirmation.
Happy’s Tech Talk #40: Factors in PTH Reliability—Hole Voids
07/09/2025 | Happy Holden -- Column: Happy’s Tech TalkWhen we consider via reliability, the major contributing factors are typically processing deviations. These can be subtle and not always visible. One particularly insightful column was by Mike Carano, “Causes of Plating Voids, Pre-electroless Copper,” where he outlined some of the possible causes of hole defects for both plated through-hole (PTH) and blind vias.