L-791
Woven Phenolic/Aramid Prepreg
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Product Data Sheet Revised 4/21/09
Description

L-791 is a 260°F (127°C) curing phenolic prepreg with excellent fire, smoke and toxicity properties. L-791 is available on 285 style aramid fabric or other styles of fabric as requested. L-791 is intended to be used as a single ply or multiple ply skin for aramid/phenolic honeycomb in aircraft interior honeycomb sandwich panels.

Advantages of L-791
  • When used without an adhesive film, L-791 prepreg facings create sandwich panels with high peel strength and high toughness.
  • Processing of L-791 can be easily adapted to most heated presses, autoclaves or ovens.
  • L-791 is also an excellent laminating prepreg when heat resistance is a requirement.
  • L-791 will allow the designer to create complex structure which meets stringent FAA burn requirements (when combined with L-591 or L-991 materials) using OSU test apparatus.
  Physical Properties on 285K Style Aramid Fabric
  • Standard Weight: 0.070 lbs/ft2 (342 g/m2)
  • Standard Resin Content: 50% by weight
  • Volatile Content: 9% max
  • Standard Tack: Medium tack
  • Cured Ply Thickness: 0.009” (0.229 mm)
  • Other Weights, Resin Contents, and Fabrics are Available.
 Availability
  • Up to 60” width in rolls up to 100 yards long (152 cm x 91 m)
Cure Cycles
  • 60 minutes minimum at 260°F (127°C) with full vacuum pressure or higher pressure using press or autoclave. Cool to 170°F (77°C) under pressure
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NOTICE:Product data and parameters cited in this publication have been obtained in J.D. Lincoln, Inc. laboratories using the materials under carefully controlled conditions. The information, therefore, is believed to be accurate and correctly stated. Data of this type may be considered to be indicative of representative properties obtainable. J.D. Lincoln, Inc. cannot accept responsibility for the misapplication of these products, nor for their use under uncontrolled conditions. Numerical values resulting from the application of this material are dependant on processing details. It is recommended that the user develop his or her own application techniques and generate data consistent with his or her specific application and process.

 
       
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