Proportioning machines come in all shapes and sizes, and are available from several manufacturers. There are numerous aspects to consider when purchasing a machine: Drive System (Electric, Hydraulic, or Pneumatic), Output (in gallons per minute, or gpm), Pressure capacity (in pounds per square inch)...

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Mobile spray rigs integrate all of the necessary tools and equipment needed for SPF application into a mobile installation package: including air and power utilities, is always ready and located in one place. These mobile all-in-one packages of spray machine, tools, compressor and generator are the standard for spray foam contractors.

In any given SPF application, you will typically find much more equipment and power utilities in addition to the proportioning machine, spray gun and heated hoses. Many different power tools are used to prepare the substrates and perform set-up, operational and clean-up duties.

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In mixing the chemical components and spraying to the intended substrate, spray guns perform the most critical functions of the spray foam application process. Spray guns are separated into three classes, depending on their functionality when the trigger is released: Mechanical purge, Air purge, Solvent purge.

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Generally speaking, spray polyurethane foam (SPF) is applied using commercially available high-pressure, plural-component proportioning technology. Alternatively, SPF can be applied using low-pressure, two-component pressurized kits, or single-component cans for smaller applications.

SPF equipment is integral to the entire process of applied spray foam: from transferring the components out of the 55 gallon material drums, to properly heating and pressurizing the materials, to pumping them through hoses, to finally mixing and spraying the components.

The two components that combine to make spray polyurethane foam (SPF) (Side A: isocyanate, and Side B: polyol resin) are typically supplied in 55-gallon drum sets, which must be shipped and stored according specific procedures. Once in use on the job site, they are transferred from the drums to the proportioning machine via specialized transfer pumps.

Spray foam machines have two metering, or proportioning, pumps (one for each component) that heat and proportion the isocyanate and polyol in a 1:1 ratio. The two materials move through the machine (commonly referred to as a proportioner) starting at the proportioning pumps, through the primary heaters, through the heated hoses, and out to the spray gun. The isocyanate and polyol resin materials are kept separated through the entire system until they come together in the spray gun, where they are mixed and spray-applied to the target substrate.