- Click here for Tech Specs
- Click here for MSDS
- Click here for photos (1" sample with an R-value of 3.9)
- Click here for a brochure
FoamLok 500 (FL500) is a half pound density open cell foam that creates an air seal undetectable by human senses. FL500 is a 2-part spray applied polyurethane cellular foam plastic. The product is sprayed on as a liquid, expands, and cures within minutes. The major differences between FL500 open cell foam and FL2000 closed cell foam are as follows:
- Aged R-value of 3.9 per inch of depth (closed cell is 6.2 (aged) per inch)
- Vapor Barrier (Open Cell is not a vapor barrier)
- Structural (open cell foam is soft like angel food cake; closed cell is a little softer than wood)
- Less Expensive (more materials are needed to produce an "R" of Closed Cell)
Although FL500 is suitable for almost any use, our typical installs of this product include:
- Residential homes
- Areas where space is not an issue (i.e. attics - new and existing)
- Sound attenuation
- Closed walls
Our paper Open vs. Closed Cell Foam is a great source for an even more detailed comparison of the products. Remember, if you're confused, just contact us. We work with these products every day!


