Atlas Fibre supplies one of North America’s largest in-stock inventories of thermoset composite sheets - ready for immediate shipment, in-house machining, or custom fabrication at our facility in Illinois (USA) and two partner facilities.
Thermoset composite sheets are manufactured by pressing and curing prepreg materials into rigid, dimensionally stable laminates. Once cured, these sheets are cut, machined, and fabricated through a variety of production processes to achieve your exact specifications.
Sheet thickness is determined by the number of plies in the layup and typically ranges from 0.005″ to over 8″. Standard full-size sheet dimensions include 36×48″, 48×48″, and 48×96″, with oversized formats up to 48×120″ available upon request. All material can be cut-to-size to support streamlined downstream machining.
Every composite sheet we manufacture or supply complies with industry standards—such as NEMA and MIL-I—and can be tested to verify critical mechanical, electrical, and thermal performance characteristics.
Whether you are sourcing for production, prototyping, or engineering evaluations, our team can help you identify the optimal combination of material grade, thickness, and sheet size to reduce complexity, improve consistency, and control costs.
Atlas Fibre offers an extensive range of thermoset composite panel materials, each engineered to deliver reliable, high-value performance across demanding applications:
Glass Epoxy (G10/FR4): High Strength & Stability
Exceptional mechanical strength, superior electrical insulation, and consistent performance across a wide temperature range.
Paper Phenolic (XX/XXX): Lightweight & Cost-Effective:
Provides excellent electrical insulation with good mechanical properties at a competitive price point.
Linen Phenolic (L/LE): Fine Weave Versatility:
A smooth, fabric-based material ideal for applications requiring precision machining and enhanced electrical properties (LE).
Canvas Phenolic (C/CE): Durable & Tough
Strong, impact-resistant material suitable for mechanical components, with CE grades tailored for improved electrical characteristics.
Glass Melamine (G5/G9): Heat & Arc Resistant
Designed for high-temperature and electrical applications where arc resistance and dimensional stability are essential.
In addition to thermoset composites, Atlas Fibre provides expertise in machining and forming thermoplastic sheets. Unlike thermosets – which permanently cure during processing – thermoplastics can be reheated and reshaped, offering more flexibility in molding or forming operations. While the materials differ, thermoplastic sheets can still be processed with many of the same methods used for thermoset composites.
Read more on thermoplastics…
Selecting the ideal composite sheet depends on the performance environment, processing method, and technical requirements of your project. Key considerations include:
Thermal Performance: Certain composite materials maintain strength and stability under extreme heat or cold. Cryogenic applications, for example, require grades engineered to withstand below-freezing temperatures without brittleness or degradation.
Electrical Insulation: If electrical properties matter, material selection becomes critical. Canvas and linen phenolics offer different insulation tiers – CE and LE provide enhanced electrical insulation compared to standard C and L grades.
Flexural Strength & Impact Resistance: These properties define how well the sheet will tolerate bending, vibration, or shock loads during use. Our team can help you evaluate which materials best align with your mechanical requirements.
If you’re unsure which direction to take, you don’t have to navigate the decision alone – Atlas Fibre’s technical specialists are ready to recommend the right materials based on performance criteria, budget, and downstream machining needs.
Atlas Fibre maintains one of the industry’s deepest inventories of thermoset composite sheets – ready to ship and ready for fabrication. Request a custom quote today or speak with our team to find the perfect sheet material for your next project.
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