VTB301 from SHD Group (Lincolnshire, U.K.) is a versatile epoxy prepreg system with up to 25% bio-content. Curing can be achieved as low as 65°C while still having a room temperature shelf life of at least 90 days. The system can be processed out of autoclave (OOA), through an autoclave or snap cured at 140°C via a press, delivering flexibility for component manufacture.

Development work has showed VTB301 to be capable in multiple forms of processing, across a range of fabric reinforcements and unidirectional formats. Thick-section carbon fiber laminates can be produced with low temperature oven cures, delivering low levels of voids/porosity. Equally, snap cures can be achieved in under 10 minutes through compression molding in heated matched metal tools.

In validating the extended out-life of VTB301, SHD manufactured panels, via both vacuum only and autoclave cure, from packs of material aged up to 90 days, before being mechanically tested. Results showed no degradation in values, demonstrating that VTB301 can be stored for extended periods at room temperature (20°C) without losing performance. When considering OOA processing, however, the extent of the workable life will be dependent on material storage conditions and specific laminate requirements.

With increased bio-content, extended out-life and versatile cure capabilities, VTB301 underlines SHD’s commitment to support its customers’ progress toward net-zero targets. The energy burden associated with the processing and storing of advanced prepreg solutions can be reduced through implementation of this highly novel resin technology, according to the company.

VTB301 joins other systems in the 300-series, which have been developed specifically to enable reduced environmental impact materials while still delivering high-performance advanced composite solutions. Initially, VTB301 will be available from SHD’s U.K. manufacturing site, with product rollout from its European and North American manufacturing facilities in early 2024.