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LECO for Empowering Results
Solvay CYCOM® 5250-4 RTM BMI Resin, Unreinforced
Categories: Polymer; Thermoset; Bismaleimide (BMI)

Material Notes: CYCOM® 5250-4 RTM is a true one-part homogeneous BMI resin developed specifically for the resin transfer molding (RTM) process. It reaches very low viscosity during transfer and maintains a low viscosity for several hours, thus providing the maximum capability to fabricate complex parts. Laminates fabricated from CYCOM 5250-4 RTM are capable of service temperatures up to 400°F (204°C), but its toughness and processability make it an ideal material for 180°F (82°C) temperature applications where epoxies are commonly used. CYCOM 5250-4 RTM offers the highest open hole compression (OHC) value of any organic matrix resin while providing the highest level of toughness available in an RTM capable matrix resin.

Features & Benefits:

  • Excellent toughness
  • Maximum continuous service temperature up to 400°F (204°C)
  • Superior hot/wet properties at 160 to 375°F (71 to190°C)
  • Low viscosity during processing
  • Low-tack, solid at room temperature provides ease of handling
  • Low thermal conductivity
  • Versatile cure, can be cured at 400°F (204°C) for 2 hours
  • Out-time greater than 60 days at room temperature
  • True one-part formulation
  • Fully compatible CYCOM 5240-4 RTM low resin content prepregs and CYCOM 782 RTM bindercoated fabrics are available for preform manufacture
  • Wing stabilizer spars
  • Fuselage skins and stiffeners
  • Low operating temperature, critical load-bearing components
  • Engine components

Information provided by Cytec, subsequently acquired by Solvay.

Available Properties
  • Density, Standard Cure
  • Density, Cure 204°C for 2 hrs no post cure
  • Water Absorption, Cure 204°C for 2 hrs no post cure
  • Water Absorption, Standard Cure
  • Tensile Strength, Standard Cure
  • Tensile Strength, Cure 204°C for 2 hrs no post cure
  • Elongation at Break, Standard Cure
  • Elongation at Break, Cure 204°C for 2 hrs no post cure
  • Tensile Modulus, Standard Cure
  • Tensile Modulus, Cure 204°C for 2 hrs no post cure
  • Flexural Strength, Cure 204°C for 2 hrs no post cure
  • Flexural Strength, Standard Cure
  • Fracture Toughness, K1C Notch Sensitivity
  • Charpy Impact Unnotched, Standard Cure
  • CTE, linear, Resin after standard cure + postcure
  • Maximum Service Temperature, Air, continuous
  • Glass Transition Temp, Tg, Cure 204°C for 2 hrs-no postcure, wet
  • Glass Transition Temp, Tg, Standard Cure+Standard Postcure, wet
  • Glass Transition Temp, Tg, Cure 204°C for 2 hrs-no postcure, dry
  • Glass Transition Temp, Tg, Standard Cure+Standard Postcure, dry
  • Processing Temperature, Standard Cure. Standard post cure is 440°F for 4 hours
  • Processing Temperature, optional cure (no postcure)
  • Gel Time
  • Shelf Life, sealed container
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Manufacturer Notes:
Solvay, former Rhodia Engineering Plastics

Category Notes

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