Principal Mineral announces the acquisition of Isola

Principal Mineral today announced the acquisition of Isola, a premier global manufacturer of copper-clad laminates and dielectric prepregs used in the production of printed circuit boards (PCBs).

The transaction expands Principal Mineral's role as a vertically integrated upstream global supply chain for PCBs while strengthening supply chain security and resilience for advanced-technology applications in critical industries. Founded in 1912, Isola brings more than a century of experience in insulation and PCB materials, along with manufacturing, R&D, technical support, and a multi-national sales operation.

Acquiring Isola is a key step in advancing Principal Mineral's core mission of rebuilding the industrial "missing midstream" - the essential layer between upstream metals production and the finished technologies that underpin key applications in aerospace, manufacturing, communications, computing, defense, and other advanced technology markets.

In 2025, Principal Mineral acquired and relaunched Camden Copper in Camden, South Carolina, saving local jobs and preserving a key U.S. copper foil plant that supplies defense-grade copper foil for printed circuit boards used in advanced defense and technology systems. With the addition of Isola, Principal Mineral adds a global portfolio of high-performance PCB materials and recognized platforms in high-Tg, lead-free compatible, and low-loss applications.

The combined organization will employ approximately 1,300 people and operate 10 facilities globally, spanning manufacturing, research and development, technical support, and commercial sales.

We are excited to welcome Isola to the Principal Mineral family as we work to strengthen supply chain resilience and optionality for our customers around the world.