Foams are generally rated by density. Density is the measurement of the compactness of an item and is calculated based on the mass (amount of matter in an object) divided by the volume (the amount of space that an object occupies) or d=m/V. Density is also described as poundage (PCF- pound per cubic foot).
An analogy for density is comparing a Styrofoam cup to a ceramic one that is the same size. The Styrofoam cup contains less mass (solid particles); therefore, it will float if put in water. The ceramic cup is comprised of mostly solid material (or mass) so it will sink instead of float. While the size of the objects is the same, it is the difference in density that changes the result. The same theory can be applied to foam. A change in density will affect the function of the product for an application.
Crown Foam Technologies offers three basic foam densities: Low, Medium and High. Each density has its’ own characteristics and uses.
Our low-density foam (5# – 9#) is considered an economical multi-purpose foam. Low-Density foams have more empty pockets than the foam of higher density. At the lower end of the spectrum, it is generally used for short-term use to seal out air, dust, and moisture. The upper portion of the spectrum can be used for sealing a tight radius and irregularly shaped applications.
Medium-density foams (10#- 14#) are for more challenging environments and longer-lasting applications. Medium-density foams will have a longer product life cycle as they have more mass than the low-density foams.
High-Density foams contain more mass than both the low and medium density foams. These types of foams are ideal for use in aggressive environments that demand tear-resistance and/or vibration dampening while still sealing out air, dust, and moisture.
When selecting the foam for your application it is essential to know the environment, life expectancy, and purpose of the foam. Knowing these vital elements of the application will be your guide to selecting the correct level of density for your project.
One thing to keep in mind is that density; like clothing sizes, will have different characteristics based on the manufacturer. One manufacturer’s 7# foam could be another manufacturer’s 5# foam. Be sure to supply all the vital elements of the application or a product sample when requesting a project quotation.
If you are unclear as to which density of foam is required, our sales team and in-house Research and Development Department will be happy to help you select the correct CFT product.