DAPCO™ 18-4F

Dapco™ 18-4F is a two-component, solvent-free, thixotropic silicone paste. Dapco™ 18-4F is most commonly used as a coating, sealant, or filleting material in the construction, repair and maintenance of all types of aircraft. The product can be applied using a variety of methods and is especially useful where fire resistance, exposure to phosphate ester fluids, and/or exposure to extreme temperatures -65°F (-54°C) to 400°F (204°C) are major considerations. The product is available in a variety of kit sizes including: ½ pint, pints, quarts, gallons, and 55 gallon drums. (Contact D Aircraft for special packaging requests).

Features and Benefits
- Environmentally friendly formulation, free of heavy metals and solvents 
- Good adhesion to a variety of substrates when used with Dapco™ 1-100 Primer 
- Excellent fire resistance, 2000°F (1093°C) catastrophic protection for 15 minutes
- Excellent weatherability 
- Performance at low operating temperatures 
- Good resistance to chemicals commonly used in aerospace applications 
- Qualified to Boeing BMS 5-63 & Pratt & Whitney PWA36751 specifications 
- Repairable with  Dapco™ 2100 Primerless Firewall Sealants


  • Global Business Unit
    Composite Materials
  • Brand


Segments Applications
Airframe Secondary structural materials | Primary structural materials
Propulsion Rocket Engine

Chemical categories

Chemical category Chemical family Chemical product
Composites Composites Silicone

Region of commercial availability

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

Download documentation for DAPCO™ 18-4F