Winter blend foams

Let it snow, let it snow, let it snow! Many regions of the country have seen a record amount of snowfall in 2010. The roof of the Metrodome collapsed and the New York Giants have been stranded not once, but twice, due to weather. So what does this have to do with spray polyurethane foam?

Now that its colder, considerations should be made when choosing spray foam. The first consideration during cold temperatures is the necessity for A and B components to be stored between certain temperatures. Included in this consideration is the need for foam to be kept warm before and during use. To understand the optimal range for the materials you are working with refer to the MSDS’s and product specifications provided by the manufacturer.

In addition to the temperature of the spray foam, consider the temperature of the substrates. A cold substrate will adversely affect the foam rising action as energy typically used to create yield is reallocated to heating the target. Jim Anderson, Manager, Applications & Training for BASF, recommends applying a light layer of foam, otherwise known as a flash coat, to help neutralize the “heat sink” effects of a target. This flash coat introduces heat to warm up the interior to help regain foaming efficiency and yields.

Manufacturers also produce a variety of foams for a wide range of applications, including specific types of foam made for colder temperatures. These special formulas modify the catalyst or B compound to increase the chemical reaction and increase the foam rising action for better performance in colder temperatures.

Ultimately, each application needs to be assessed to consider the factors in this article as well as many others. Refer to the latest published information such as manufacturers guidelines, technical specifications, industry publications and application instructions to find the best solution for you and your customers.