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Product functions: High Service Temperature (>150°C)


FM®309-1 is a next generation film adhesive for bonding composite and metallic structures. This new film provides a unique combination of high Tg [360°F (182°C)], high toughness and higher temperature properties. FM®309-1 is compatible with most 350°F (177°C) curing epoxy-based prepreg systems. This new film has excellent resistance to pre-bond and post-bond humidity and has a service temperature of 350°F (177°C).
FM®309-1 adhesive film provides excellent handling properties (good tack and drape) and has a minimum shop life of 30 days at 75°F (24°C).
FM®309-1 adhesive can be supplied as a supported (woven glass, knit or mat carrier) or unsupported film at various weights and thicknesses. For co-cure or co-bond applications, adhesive film weight of 0.030 – 0.050 psf (146 gsm – 244 gsm) with mat carrier is recommended. This adhesive film is suitable for bonding of monolithic or sandwich structures. Honeycomb sandwich panels manufactured using FM®309-1 adhesive film demonstrate excellent laminate quality - void content < 1>

FM®309-1 adhesive film can be cured at 350°F (177°C) in 90 minutes at 40 psi (0.28 MPa) or can also be cured under vacuum-only pressure. The performance after vacuum cure is comparable to that after pressure cure.
Typical application for FM®309-1 include bonding of composite and metallic structures, as well as co-cure, co-bond, and secondary bonding applications

Features and Benefits
  • · 350°F(177°C) curing high performance composite bonding film
  • · Compatible with most 350°F(177°C) curing epoxy prepregs
  • · Excellent fracture toughness (co-cure, co-bond or secondary bond)
  • · Service temperature of 350°F(177°C) dry and 285°F(141°C) wet
  • · Excellent resistance to both pre-bond and post-bond humidity
  • · Good combination of high peel and shear properties Tg >; 356°F (180°C)
  • · Suitable for bonding composite sandwich structures (good filleting properties)
  • · Good tack and handling properties· 
  •   Shop life >;30 days at 75°F (24°C)
  • · Storage life of 12 months from date of shipment when stored at or below 0°F(-18°C)


Segments Applications End uses
Advanced Air Mobility Air Taxis / Heavy Goods Cargos Structures
Advanced Air Mobility Large Cargo Drones Structures
Fixed Wing Aircraft Structures Wings and Empennages
Defense Next-generation aircraft

Processing Method

  • Autoclave
  • Vacuum Bag Only
  • Compression Molding

Chemical categories

Chemical category Chemical family Chemical product
Composite materials Thermoset composite Epoxy

Product Functions

  • High Service Temperature (>150°C)


Physical form

Region of availability

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

Download documents for FM®309-1

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