Engineered for high-performance composite structures, this 100-foot spool of micro pultruded solid carbon rod (1/8 in, 3.18 mm diameter) offers unmatched strength, stiffness, and consistency for aircraft wing spars, D-tube reinforcements, control surfaces, and other high-load components.
This rod is featured prominently in Jim Marske’s Composite Design Manual and has been used successfully in Marske Aircraft sailplanes for decades.
Compared to aluminum, fiberglass, and wet layup carbon roving, this material sets a new standard for structural efficiency.
Manufactured in the USA using a proprietary pultrusion process, each rod contains tightly controlled resin content (±1%) and fully aligned unidirectional fibers under constant tension.
No oil-based die additives are used, ensuring optimal bonding with epoxy resin systems. The result is a consistent, high-performance product with tensile strengths exceeding 320,000 psi and modulus of elasticity of 21 million—over twice that of 2024-T3 aluminum.
Compared to traditional methods:
– 6x stronger than 2024-T3 aluminum
– 2x stiffer and nearly half the weight
– 3.5x stronger in tension and 5.5x stronger in compression than wet layup carbon roving
– Faster spar construction with more predictable results and reduced labor
Applications:
– Carbon or fiberglass wing spars
– D-tube reinforcement in female molds
– Composite panel stiffeners
– Control surface structures
– Wood spar retrofits (for added strength with minimal weight gain)
– UAVs, experimental aircraft, and aerospace prototypes
Specifications:
– Diameter: 0.125 inch (3.18 mm)
– Length: 100 feet
– Tensile Strength: 320 ksi (2.34 GPa)
– Compressive Strength: 270 ksi (1.90 GPa)
– Tensile Modulus: 19.5 msi (134 GPa)
– Compressive Modulus: 19.0 msi (131 GPa)
– Fiber Volume: 67%
– Matrix: Bis-F Epoxy
– Glass Transition Temp: 100°C
– Ultimate Tensile Strain: 1.30%
– Diameter Tolerance: ±5%
– Made in the USA
Design Considerations:
Jim Marske’s Composite Design Manual offers detailed insights into embedding rods in wing caps, managing deflection in long-span structures like sailplanes, and proper epoxy selection for high-strength bonds. For ultra-efficient spars, use multiple rods in a mold-based design to cut deflection and improve stiffness without compromising weight.
Ships coiled and ready to use.
For custom coil lengths beyond 100 feet, please contact us directly.
