Thermal interface material

Composite Materials

Solving The Problems of Delamination in Advanced Lightweight Composite Materials

ZRT® Interlaminar Reinforcements

Interlaminar toughening: 30% increase in interlaminar shear strength (ILSS) in matrix-limited applications (ceramic matrix composites, resin infiltrated components, bonded composite structures)

Local reinforcement: material can be deployed only where delamination occurs, simplifying design and qualification processes

Rapid integration: material can be applied as a dry fiber film, absorbing surrounding excess resin, circumventing the need to create standalone prepregs; material can also be prepregged as needed using conventional processing methods

This product addresses the design limitations caused by delamination in carbon fiber composite structures. It employs vertically aligned milled carbon fibers that span the interlaminar region, effectively connecting neighboring composite plies. The product can be utilized as a local reinforcement to selectively toughen specific regions without disrupting the overall structure or as a global reinforcement, applied between every ply.

One key application is enhancing composite structures with sharp bend radii or terminations, such as stringers, stiffeners, and pi-joints. These structures often suffer from interlaminar failure due to the low fracture toughness and poor out-of-plane mechanical properties of conventional composite reinforcements. Such performance deficiencies limit the use of lightweight composites in next-generation airframes, compelling developers to rely on heavy and costly metallic structures.

Another critical application is improving high-temperature composite structures, like high-speed spacecraft heatshields. Interlaminar failure in these ceramic matrix and carbon-carbon composites is driven by immense internal stresses and volume shrinkage during fabrication. Traditional solutions, like three-dimensional weaving and fiber placement techniques, are costly and create continuous fiber pathways that transfer ambient heat into the airframe during atmospheric re-entry. This product offers a more cost-effective and efficient alternative, enhancing the durability and performance of high-temperature composite structures.

ZRT Interlaminar Reinforcements

Patented Z-axis Fiber Technology

Boston Materials uses vertically aligned carbon fiber to create materials with optimal energy transfer
properties – including thermal, electrical, and mechanical 

Conventional Composites

Inefficient energy dissipation

Boston Materials Z-Axis Fiber™

Very efficient energy dissipation

Empowering Industries
with Z-axis Fiber™

Solving key problems relating to thermal management,
electrification, and lightweighting across high-growth industries

Electrified vehicles


Hot AI race needs cool chips

Electrified vehicles

Electrified Vehicles

Journey to 100% electrification



Sky-high expectations for airplanes


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