The Science of Experience



Under Pressure: Know the Difference Between High and Low

Posted by Becky Eades

Nov 12, 2015 11:30:00 AM


Whether searching for spray foam materials for your construction projects or exploring spray foam as a solution for your home, it's essential to know the difference between the two main types of SPF applications: high and low pressure.

Low-Pressure Spray Foam Applications

There are two different sub-categories of low-pressure SPF products. The first is sealant foams, which are typically sold in aerosol cans and can be used to seal cracks and holes. One-component sealant foams are generally sold in hardware stores and can be used for DIY projects, while two-component foams are typically applied by professionals and come in larger, 5 - 30 pound kits.

Low-pressure spray foam insulation, the second type of low-pressure SPF, is quite different from sealant foams. Systems for applying low-pressure SPF insulation consist of two cylinders, each of which can be refilled with its component. The cylinders are pressurized to about 200 psi, allowing the foam to be ejected without the application of heat. This type of system is typically used for small-scale projects and minor repairs.

High-Pressure Spray Foam Application

High-pressure SPF application also utilizes two different chemical components, but in this case, the components are stored in two separate, unpressurized barrels that hold 55 gallons or more. The materials are put under pressure as they're sucked into specialized hoses. SPF typically reaches a temperature of 100 - 140ºF as it travels through these hoses, and it can be under up to 1500 psi of pressure. High-pressure SPF application can pump foam material at 45 pounds per minute.

High-pressure spray foam application is typically used in larger-scale projects, such as new buildings and extensive remodeling projects. When applied with a high-pressure system, SPF seals tightly to surfaces and provides a moisture barrier.

Visit NCFI for the highest quality spray foam materials for your construction projects.


Topics: Training & Support, Spray Polyurethane, NCFI