Tailor-made prepreg stacks by Gurit and Voith

Carbon4Stack for an easier, faster, flexible processing of prepregs

  • Design freedom for high performance structural parts
  • Broad range of surface solutions
  • Various resin systems and fibers fit to purpose
  • Ready to mould solution
  • Significant time savings in autoclave operations 
  • Tailored prepreg blanks

A solution making composites production easier and broadens its range of applications.

Our tailored stacks are made of pre-impregnated 50mm-wide UD tapes. Each tape is automatically placed using VRA technology, creating the desired layup. The final stacks are multi-ply laminates with variable thicknesses and local reinforcements, manufactured in near net shape to provide the ideal solution for the customer.

Tailored stacks

  • Reduced manual processes: automated fiber placement with reproducibility of the laminate quality
  • Maximum freedom in fiber orientation: from 0° to 90°, based on customer requirements
  • Cost savings: no labor-intensive operations, reduction of waste with near net shape fiber placement
  • Weight savings: local reinforcement layers allow load-specific material usage. Material is only applied where necessary
  • Best fiber performance: non-crimped and non-stitched fiber placement
  • Online process control and quality assessment

Customized material setup

  • Resin system: formulated according to customer requirements. Glass transition temperatures up to 208 °C are available

  • Fiber: different grades of carbon fiber and glass fiber can be used in the production of the stack to adjust the characteristics of the components

  • Variable tack (low and high)

  • Pre-cut to final shape

  • Hybrid material configuration: customized material combinations of glass and carbon fiber in one single tailored stack possible

Manufacturing processes

Tailored stacks can be impregnated with different solvent free hot-melt resin systems suitable for:

  • Prepreg compression moulding

  • Autoclave processing

  • Out of autoclave
  • Automated as well as manual handling

Sizes and availability

  • Max. size of the stack 1 600 mm x 1 800 mm

  • Variable thickness

  • Flexible production of high and low quantities from prototype phase to serial production


  • Tailored stacks are delivered with a smooth film on the lower side and a diamond embossed film on the top side

  • Storage in sealed vacuum bag at -18 °C

  • Out life at 21 °C: 7 – 50 days, depending on required processing properties of the tailored stack

Technical product support

  • On site support for manufacturing process
  • Layup and draping simulation
  • ayup and draping simulatio
  • Cost and feasibility studies


  • Compliant to UL 94v0, EN 45545, EN 13501 and SOLAS IMO FTP code
  • Qualified to Lloyd‘s Register and DNV-GL
  • Several aerospace certifications
  • ISO 9001, ISO 9100
  • ISO 14001
  • REACH compliant

Typical stack solutions

Various fields of applications in Automotive, Aerospace, Marine and many other industrial applications:

ApplicationProcessing methodTg1 (DSC) [°C]Cure cyclesShelf-life
RT [days]
-18 °C [months]
Fibre type
High volume Class APCM1805 min
at 170 °C
Class APCM
14010 min
at 135 °C
Visual carbonPCM
13030 min
at 130°C
Visual carbon high TGPCM
17030 min
at 180°C
13060 min
at 120°C
12535 min
at 120°C
ToolingAutoclave2086 h at 60 °C
+ postcuring cycle
3 (tack-life)6E-Glass

PCM Prepreg compression moulding
OoA Out of autoclave
FST Fire smoke toxicity
HRR Heat release rate

“I’m very happy that we could win Gurit as a partner. Their broad product range and their expertise as well as their flexibility and high motivation to move this project forward have given us a real boost.”

Andreas Silvan

Program Manager Prepreg Stacks, Voith Composites

“The Voith Roving Applicator NextGen can move composites to the next level. It’s a great way to process our material – flexible, automated and leading to an impressively high quality. Our pilot customers are delighted and so are we.”

Piet Heydorn

Sales Manager, Gurit

Share your contact details to get more information

Voith Group

Andreas Silvan
Program Manager Prepreg Stacks

M +49 151 73035524

Gurit Group

Piet Heydorn
Regional Sales Manager & Technical Sales

M + 49 162 2434 968