L-561 is a 140°F (60°C) curing, high strength, flame retardant, epoxy prepreg available on woven fiberglass fabrics such as 7781 or as requested. L-561 is intended to be used as a single ply or multiple ply skin for complex or contoured laminates, custom moldings, foam-cored or balsa-cored panels, and for low-temperature tooling prototypes.

• Low temperature cure coupled with high strength and toughness in this system make it ideal for complex shapes, molds or tools in the automotive, marine, and aerospace industries. Further, L-561 can be bonded directly to a variety of substrates for general purpose use.
• Easy processing is another major advantage. L-561 can be cured with vacuum bag, press, or autoclave from 20 hours at 140°F (60°C) or in just 30 minutes at 225°F (107°C) with contact pressure. L-561 also exhibits good stability at elevated temperatures.
• L-561 is also an excellent laminating prepreg which high impact strength and high toughness are required.
• L-561 will also find quick acceptance where unique designs or prototypes are being constructed. The low energy cure system allows for processing and lay up without the aid of elevated temperature curing.

• Standard Weight: 0.105 lbs/ft² (513 g/m²)
• Standard Resin Content: 42% by weight
• Volatile Content: 2% or less
• Standard Tack: High tack on both sides
• Cured Ply Thickness: 0.010” (0.254 mm)
• Other Weights, Resin Contents, and Fabrics are Available.