3M (St. Paul, Minn.) has unveiled Matrix Resin 3831, a high-performance epoxy thermosetting resin system for carbon fiber composites. Designed for prepreg use, it’s said to be suitable for sporting goods and high-performance structures that require significantly improved compression strength and reduced crack propagation. 3M tests comparing the new resin to standard epoxy 76 percent improvement in shear modulus, 73 percent improvement in toughness and 68 percent improvement in Barcol hardness. 3M says carbon fiber prepreg tapes manufactured using the new resin have the same processing characteristics as standard prepregs and can be used in a manufacturer’s prepreg lay-up process without modifications. Cure is initiated at the same temperature and the resin has similar flow properties as typical 250°F/121°C cure prepreg resins.