SPF Spray Guns
The spray gun is used to apply the foam onto the wall or into the wall cavity. The spray gun is important, because this is where the isocyanate and resin materials meet and react.
Proper mixing is critical to ensure that the material properties are established and maintained over the life of the building. When choosing an spray gun, it is important to choose a spray gun that is easy to maintain, easy to spray and applies material according to manufacturer’s recommendations.
What is the difference in spray guns?
Graco Fusion spray guns are available with air purge, mechanical purge, and liquid purge. Each gun has its own unique benefits:
AIR-PURGE
- The most commonly used guns in the spray foam market
- Uses a blast of compressed air to keep the mixing chamber clean
- Contains fewer parts than mechanical purge guns
- Easier to spray and maintain than mechanical purge guns
LIQUID PURGE
- Most recently introduced to the spray foam market
- Liquid is dispensed into the mix chamber at each trigger pull, removing build-up material and keeping the mix chamber clean
- Uses significantly less purge air than an air purge gun
MECHANICAL PURGE
- Use a steel rod to physically push any residual material out of the mix chamber to keep it clean
- Contain more parts than air purge guns
- Require more maintenance than air purge guns
- Offers widest range of flow rates
NOTE: The mixing chamber is the area where the isocyanate and resin materials meet and mix. The mixing chamber needs to stay as clean as possible to maintain good material properties and a consistent spray pattern.
