Karwon Composites supplies flat laminate in cosmetic, quasi-isotropic and unidirectional layups, cut to size.
Tell us the panel size, the load direction and your deflection limit, and we will point you to the right layup.
The layup of a carbon fibre sheet decides how it behaves under load, and it matters more than the thickness alone. Cosmetic twill is chosen for appearance, quasi-isotropic for panels that must be strong in every direction across the face, and unidirectional for maximum strength along one axis. Picking the wrong one is the most common mistake buyers make with flat carbon.
Why layup matters more than thickness
Carbon fibre is only strong along the direction its fibres run. A sheet is built from stacked plies, and the angle of each ply decides which directions are reinforced. Two plates of identical thickness can behave very differently: one may be stiff along its length and weak across it, the other even in both. So the first question is not how thick, it is which way the loads run.
Cosmetic twill
A cosmetic sheet uses a 2x2 twill weave on the visible surface for the familiar chequered carbon look. Structurally it behaves like a balanced woven laminate, reasonably even in the plane of the sheet, but the priority in its construction is finish quality rather than optimised mechanical performance.
Choose it for visible parts: trim, covers, panels and housings where appearance carries as much weight as strength. If the part is hidden and purely structural, you are paying for a finish you will never see.
Quasi-isotropic
A quasi-isotropic layup stacks plies at 0, 90 and plus and minus 45 degrees so the laminate has broadly similar properties in every in-plane direction. That is what you want when a panel takes load from directions you cannot fully predict, or from several at once.
This is the sensible default for structural plate: brackets, mounting plates, drone frame plates, equipment panels and machined parts. It is the most forgiving choice when a plate will be cut, drilled or loaded in ways the original design did not anticipate.
Unidirectional
In a unidirectional layup, all or most fibres run one way. That concentrates the material's strength and stiffness along a single axis, giving the highest performance in that direction of the three options, at the cost of being comparatively weak across it.
Use it for spars, stiffening strips, beam caps and any member where the load path is known, straight and along the length. It is a specialist choice, not a general-purpose plate.
Choosing thickness and size
Once the layup is settled, thickness follows from stiffness and deflection requirements rather than from strength alone, since most flat panels fail by flexing too much long before they break. Where a plate will be bolted or clamped, remember that holes and edges interrupt fibres, so the layup around fixing points matters as much as the plate itself. Sheets can be cut to your drawings, so it is worth designing the panel and then choosing the stock size, not the other way round.
Matching layup to the job
A short version:
- The part is seen: cosmetic twill.
- The part is structural and loads vary: quasi-isotropic.
- The part carries load along one known axis: unidirectional.
If you are unsure, quasi-isotropic is the safer default. It gives up a little peak performance in exchange for behaving predictably in every direction.
Sourcing carbon fibre sheets in the UAE
Karwon supplies carbon fibre sheets and plates across cosmetic, quasi-isotropic and unidirectional layups, cut to size, with short lead times, and documentation requirements agreed at quotation stage. If you tell us the panel size, the load direction and your deflection limit, we can point you to the right layup and thickness rather than the most expensive one.
More on buying material here: sourcing carbon fibre in the UAE. Or send your drawing through our contact page.