CYCOM® PR 520N RTM is a one-part, 179°C (355°F) curing epoxy resin system offering superior damage tolerance and good strain to failure required for composite primary structure applications.

The value of resin infusion is the ability to design complex geometric parts while leveraging a unitized structure which ultimately leads to a reduction in weight, lower part counts and the elimination of many post-manufacturing processes.

CYCOM® PR 520N RTM is an off-white thick paste at room temperature reducing to a low viscosity when heated for injection. The resin has a low enough viscosity to allow injection at 90°C (194°F) to 100°C (212°F). Following injection, the resin viscosity decreases with increasing tool temperature to below 50 cP (50 mPa·s), thus helping to ensure full fiber wetting.

CYCOM PR® 520N RTM resin is fully cured following a 2-hour dwell at 179°C (355°F) after which it has a continuous hot/wet service temperature of 104°C (220°F).
For reinforcement preforming operations, a fully compatible binder system, CYCOM® 7720 RTM, and a low areal weight film, CYCOM® PR 520-1, have been developed for use with CYCOM® PR 520N RTM. The binder and low areal weight film are available pre-coated onto fabrics of the customer’s choice. A separate datasheet for CYCOM® 7720 RTM is available upon request.

Typical applications for CYCOM® PR 520N RTM include containment cases, engine blades, engine blade spacers/platforms, outer guide vanes, hinges, brackets, fittings and generally primary structure applications requiring superior toughness.

Features and Benefits
• One-part epoxy resin system
• 30 day out-life at room temperature [24⁰C (75⁰F)]
• 18 month shelf-life at -18°C (0°F)
• Low exotherm, i.e., thick part production capable
• ~500 cP (500 mPa·s) initial injection viscosity
• <50 cP (50 mPa·s) minimum viscosity
• Full cure after 2 hours at 179°C (355°F)
• Continuous hot/wet service performance >104°C (220°F)
• Low moisture absorption, ~0.6%
• High resin toughness
• Fully compatible binder, CYCOM® 7720 RTM, available


  • Global Business Unit
    Composite Materials
  • Brand
  • Synonyms
    cycompr520n; pr520; 520n; pr520n; cycom pr 520 n; cycom 520n; cycom 520 n; pr 520 n;


Segments Applications
Airframe Secondary structural materials | Primary structural materials

Chemical categories

Chemical category Chemical family Chemical product
Composites Thermoset Epoxy

Region of commercial availability

  • Asia / Pacific
  • Europe / Middle East / Africa
  • North America
  • Latin America

Download documentation for CYCOM PR520N