FM® 300

FM® 300 is a 3500F (1770C) curing modified epoxy film adhesive available with three different moisture-resistant polyester carriers, and is designed for bonding metal-to-metal and sandwich composite structures. To achieve ultimate environmental resistance in bonding aluminum details, use pre-cured BR® 127 primer with FM® 300 film adhesive.
Extensively used as a surface finished ply on composite materials’ outside layers, FM® 300 film adhesive has unique properties which drastically reduce, and in some cases virtually eliminate, time-consuming sanding and filling operations.
FM® 300 film adhesive has high elongation and toughness with high ultimate shear strength. This makes it particularly suitable for redistributing the high shear stress concentrations of graphite epoxy-to-metal bonds, and allows it to accommodate the low inter-laminar shear strength of the composite. It is particularly good in fatigue resistance in these joints. In properly designed and processed joints, the tight- knit tricot carrier provides a degree of electrical isolation between metal and graphite
composites to reduce galvanic corrosion.
Typical applications for FM® 300 include metal-to-metal bonding, composite-to-composite bonding, composite-to-metal bonding, and composite surfacing.

Features and Benefits
• Superior metal-to-metal peel strength, composite-to-composite bonding and composite-to-metal joints
• Extensively used as surfacing ply for composite materials
• Service temperature from -67°F to 300°F (-55°C to149°C)
• Excellent moisture and corrosion resistance in high humidity environments with no significant reduction in mechanical properties
• Allows x-ray inspection of assemblies due to natural opacity of adhesive formulations
• Available in a wide range of film thicknesses tailored to specific applications
• Industry wide acceptance
• Compatible for co-cure or simultaneous autoclave with product FM® 61, FM® 96, and BR® 127


  • Global Business Unit
    Composite Materials
  • Brand
  • Synonyms
    FM300; 300; FM 300; Adhesive film;


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 FM 300