KB-6161C high-Tg laminate from Kingboard Holdings - built for dense AI server boards

Reviewed: ad hoc news B2B & Pro desk. Edited and checked on 2026-06-28, 01:24. Details in the imprint.

KB-6161C high-Tg laminate from Kingboard Holdings sits under a humming rack of AI servers, its fiberglass core hidden behind blinking status LEDs and the faint smell of warm epoxy. Engineers run their fingertips along dense PCB panels before mounting them, feeling a tidy, rigid board that refuses to flex.

What KB-6161C is made for

KB-6161C is a high-Tg epoxy copper-clad laminate designed for multi-layer printed circuit boards in servers, networking gear, and industrial control systems. High-Tg here means the material keeps its mechanical integrity at elevated temperatures where ordinary FR-4 starts to soften.

Kingboard positions its high-Tg laminates as part of a broader copper-clad laminate portfolio aimed at AI servers, IC packaging substrates, and other high-frequency applications, building on years of experience in board materials and copper foil technology.

How it behaves in real racks

In a crowded data center, KB-6161C is meant to sit near hot CPUs and VRMs without warping, delaminating, or creeping out of spec. The resin system targets good thermal stability so traces stay where the CAD designer put them, even in a 24/7 load scenario.

Design engineers care about drilling quality and layer registration, and KB-6161C is specified to work with fine vias and tight tolerance stack-ups so high-layer-count boards for AI accelerators and network switches can be manufactured with consistent yields.

Thermal and electrical character

High-Tg laminates like KB-6161C typically offer glass-transition temperatures that comfortably exceed 150°C, which matters when boards sit near AI accelerators and voltage regulators that generate steady heat in confined spaces.

The epoxy matrix and glass weave are tuned to maintain dielectric properties over a broad temperature band, helping controlled-impedance traces on high-speed links keep timing under control even as the rack temperature fluctuates.

Copper foil and loss performance

Kingboard has been developing HVLP and VLP copper foils for AI servers and IC packaging substrates, aiming to reduce surface roughness and signal loss at high frequencies.

KB-6161C takes advantage of this foil know-how by pairing its high-Tg resin with low-profile copper, so differential pairs running at multi-gigabit speeds see cleaner eye diagrams and lower insertion loss.

From Leslie Cheung’s strategy to factory floors

Leslie Cheung, the long-time driver behind Kingboard’s laminate business, has explicitly tied the group’s material roadmap to AI server demand and high-speed networking, pushing investments into HVLP copper foil and high-end laminate capacity.

Those investments show up on the factory floor in lines dedicated to high-layer-count boards above M6 level and advanced copper foils, which are expected to ramp further around 2027.

Drilling, plating, and reliability

For PCB fabricators, KB-6161C’s job is to survive multiple thermal cycles, drilling, desmear, and plating without resin cracks or glass fiber exposure that would later cause field failures.

High-Tg chemistry helps plated through-holes stay intact during assembly reflow and rework, which is critical when AI boards with expensive accelerators need occasional component swaps instead of scrap.

Price point and target customers

Kingboard typically sells high-Tg laminates like KB-6161C to PCB manufacturers rather than to end consumers, so pricing is negotiated per volume, thickness, copper weight, and certification requirements.

Customers range from large Asian board houses feeding global server OEMs to smaller regional fabs that build industrial control boards, all looking for a convincing balance of thermal resilience and processability.

Where KB-6161C fits in the lineup

Kingboard’s portfolio spans standard FR-4, mid-loss materials, high-Tg laminates like KB-6161C, and increasingly advanced low-loss boards aimed at high-frequency, high-speed, low-signal-loss applications.

KB-6161C sits as a workhorse for thermally stressed multi-layer boards, below the premium RF materials but above commodity FR-4, and becomes a default choice when designers want more margin without fully entering RF laminate territory.

Stock context and listing

All told, KB-6161C is one of the quiet backbone products supporting Kingboard’s role as a major copper-clad laminate supplier in the AI and networking build-out. Kingboard Holdings shares (ISIN HK0000001229) trade on the Hong Kong Exchange in Hong Kong dollars.

This article was AI-assisted and editorially reviewed. Product information without guarantee; prices and availability may change at short notice. No investment advice, no buy or sell recommendation. Stock-market transactions involve risks up to total loss.

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