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400 g/m² (11.8 oz/yd²), 50 cm

UNIDRY® Carbon non-crimp fabric (UD) 400 g/m², width 50 cm

USA: width 19.69", weight 11.8 oz/yd²

High-performance UD carbon fibre non-crimp fabric for highly loaded laminates
The 400 g/m² UNIDRY® UD carbon fibre non-crimp fabric aligns virtually all carbon fibres in the primary load direction, making it particularly suitable for highly loaded laminates, structural reinforcements and sandwich components. The straight, parallel fibre alignment allows the mechanical properties of the carbon fibres to be utilised very efficiently. A very lightweight polyester fixing grid applied to both sides stabilises the UD material, facilitates cutting and handling, and helps maintain accurate fibre alignment during lay-up.

UNIDRY® is a unidirectional carbon fibre non-crimp fabric made from ZOLTEK™ PX35 50k carbon fibre. Unlike conventional woven carbon fabrics, the fibres are not interlaced but remain largely straight and parallel in the 0° direction. This avoids the fibre crimp typically caused by intersecting warp and weft yarns in woven fabrics. The high 400 g/m² areal weight enables efficient laminate build-up and is particularly suitable for components where a high fibre content or greater laminate thickness is required with a relatively low number of plies. The carbon fibres are held in position by a very lightweight polyester fixing grid on both sides. This stabilises the UD material during cutting, positioning and lay-up and helps prevent the parallel fibres from shifting or spreading.

Fibre	ZOLTEK™ PX35 50k
Fibre orientation	unidirectional (UD), parallel
Areal weight	400 g/m²
Width	50 cm
Fixing grid	Polyester, 76 dtex, 3.5 g/m², both sides
Fibre tensile strength	4137 MPa
Fibre tensile modulus	242 GPa
Elongation at break	1.5 %
Fibre density	1.81 g/cm³
Filament diameter	7.2 µm

Advantages

Efficient use of fibre properties: The carbon fibres remain straight and parallel to the primary load direction.
No woven-fabric crimp: As the fibres are not interlaced, their mechanical properties can be utilised particularly efficiently in the 0° direction.
High fibre volume fractions possible: Suitable for lightweight, high-performance CFRP laminates.
Efficient laminate build-up: The 400 g/m² areal weight allows greater laminate thicknesses to be achieved with comparatively few plies.
Stabilised on both sides: The lightweight polyester fixing grid on both sides holds the fibres in position and facilitates cutting, positioning and lay-up.
Good cutting stability: The UD material can be cut to different contours with considerably less tendency to fray than conventional woven fabrics.

Applications

The 400 g/m² UD carbon fibre non-crimp fabric is particularly suitable for components requiring high stiffness and strength in a defined load direction. Typical applications include:

highly loaded CFRP laminates and reinforcements
sandwich structures
spar and flange reinforcements
model making and composite tooling
structural composite components
components primarily subjected to tensile or bending loads
local reinforcement of existing laminate structures

By combining several UD plies at different fibre orientations, the mechanical properties of the laminate can be tailored to the specific load paths within the component.

Suitable Resin Systems

Suitable epoxy resin systems are generally preferred for structural CFRP laminates. Good carbon fibre wet-out is essential. The resin system and its working time should be selected according to component size, processing method and processing temperature.